New data on Dolichopodidae (Diptera Brachycera) from the Vosges: four new species for France and first departmental check list

Tissot B. & Pollet M. 2025. New data on Dolichopodidae (Diptera Brachycera) from the Vosges: four new species for France and first departmental check list. Bulletin de la Société d'Histoire naturelle et d'Ethnographie de Colmar, 82 (21) : 157-165. https://doi.org/10.5281/zenodo.17763080 © 2025, the authors. Published by Société d'Histoire naturelle et d'Ethnographie de Colmar This in an open access article under the Creative Commons BY-NC-ND 4.0 international licence Published in Bulletin de la Société d'Histoire naturelle et d'Ethnographie de Colmar ISSNprint 1637-6811│ISSNonline 2827-4318│https://museumcolmar.org/bulletin 157 ▪ New data on Dolichopodidae (Diptera Brachycera) from the Vosges: four new species for France and first departmental check list Bruno TISSOT Amis de la Réserve Naturelle du lac de Remoray Maison de la réserve, 28 rue de Mouthe, F-25160 Labergement-Sainte-Marie [email protected] Marc POLLET Research Institute for Nature and Forest (INBO), Herman Teirlinckgebouw, Havenlaan 88 bus 73, B-1000 Brussels Royal Belgian Institute for Natural Sciences (RBINS), Vautierstraat 29, B-1000, Brussels [email protected] Résumé  Nouvelles données sur les Dolichopodidae (Diptera Brachycera) des Vosges : quatre nouvelles espèces pour la France et première liste départementale Afin d'améliorer nos connaissances sur la faune de dolichopodidae (Diptera) du massif des Vosges, neuf campagnes entomologiques ont été réalisées entre 1993 et 2021. Elles comprennent un échantillonnage à l’aide de tentes Malaise pendant une saison entière dans les Réserves Naturelles de la tourbière de Machais (2009, 2020, 2021), de Tanet-Gazon-du-Faing (2009, 2010), de la tourbière des Charmes (2014, 2015), et deux campagnes principalement de collecte au filet fauchoir et assiettes colorées sur trois (1993) et cinq (2010) sites des Vosges. Ces campagnes ont permis de récolter un total de 6 656 spécimens appartenant à 82 espèces. Quatre espèces concernent des premières mentions pour la France : Dolichopus stenhammari Zetterstedt, 1843, Medetera brevitarsa Parent, 1927, Syntormon submonilis Negrobov, 1975 et Systenus bipartitus (Loew, 1850). La première liste de référence des Dolichopodidae des Vosges est produite. Mots-clés  Entomofaune, faunistique, premières mentions, inventaire, tente Malaise, pièges colorés, échantillonnage Abstract  In order to improve our knowledge on the dolichopodid fauna (Diptera: Dolichopodidae) of the Vosges, nine entomological surveys were carried out between 1993 and 2021. These include sampling during a full season using Malaise traps in the Nature Reserves of the “tourbière de Machais” (2009, 2020, 2021), of “Tanet-Gazon-du-Faing” (2009, 2010), and of the “tourbière des Charmes” (2014, 2015), and two series of collecting trips with sweep nets and pan traps at three (1993) and five locations (2010) in the Vosges department. These surveys produced a combined 6,656 specimens of 82 species. Four species represent first records for France: Dolichopus stenhammari Zetterstedt, 1843, Medetera brevitarsa Parent, 1927, Syntormon submonilis Negrobov, 1975 and Systenus bipartitus (Loew, 1850). The first check list of Dolichopodidae in the Vosges has been produced. Keywords  Entomofauna, faunistics, first records, inventory, Malaise trap, pan trap, sampling. INTRODUCTION With nearly 8,400 described species worldwide (Grichanov 2017, Neal EVENHUIS, personal communication 2025), longlegged flies or Dolichopodidae (Diptera) currently represent the third largest dipteran family, after Limoniidae and Tachinidae (Neal EVENHUIS, personal communication 2025). The family consists of 17 subfamilies, including the basal Microphorinae and Parathalassiinae, and 15 other subfamilies, generally referred to as Dolichopodidae s. str. (Pollet & Brooks 2008). Although longlegged flies occur in nearly every terrestrial and semi-aquatic habitat type, most species prefer humid to moist conditions. As a result, the highest species richness and numbers are found in humid forests, marshes and on banks of various waterbodies. More specialized communities are encountered in oligotrophic (heathlands, peat bogs) and halophilous biotopes (brackish and salt marshes) (Pollet 2000, Pollet & Meuffels 2023). As many species exhibit a pronounced habitat affinity, the family as such serves well as bio-indicator in e.g., site quality assessments, in particular of humid biotopes (Pollet 2009). Apart from the plant mining larvae of Thrypticus Gerstäcker, 1864 (Dyte 1959, Bickel & Hernandez 2004), in general both adults and larvae are predatory and feed on small invertebrates (Ulrich 2004). Tree trunk-dwelling Medetera Fischer von Waldheim, 1819 species play an important role as biological control agents of bark beetles. Indeed, their larvae live in the galleries of the latter pest species and feed on eggs, larvae, pupae and even freshly emerged beetles (e.g., de Leon 1935, Kenis et al. 2004). The family thus contributes to the ecosystem service “crop protection”. In France, 410 species of Dolichopodidae have thus far been reported (TAXREF 2025, after adjustment). Information on the dolichopodid fauna of the Grand Est region, and more specifically the Vosges, however, is largely lacking. ▪ Tissot B. & Pollet M. ▪ 158 The main aim of this article is to publish the results of the identifications made from samples collected in the “tourbière de Machais” Nature Reserve in 2009, 2020 and 2021. In addition, results on samples collected during other surveys in the Vosges department have also been included in order to provide a more comprehensive view on the dolichopodid diversity in this part of France. MATERIAL AND METHODS The data presented here were collected during multiple surveys (all sampling locations are indicated in the Table 1). (i) The “tourbière de Machais” National Nature Reserve, its geographical location and its natural habitats are presented in detail in the introductory paper by Claude et al. (2025), together with the sampling plan for the entomological inventory, the position of the Malaise traps and the approach to sorting and validating the yields. Malaise trap samples from 2009 (2 traps), 2020 (4 traps) and 2021 (3 traps) were sorted by Jocelyn CLAUDE as part of a mandate for the “Parc naturel régional des Ballons des Vosges”, subsequently identified by us, also as part of a mandate for the same organization. Bruno TISSOT carried out the majority of the determinations, and Marc POLLET verified or identified the rare or doubtful specimens. (ii) The “Tanet-Gazon-du-Faing” National Nature Reserve was also studied in 2009 as well as in 2010 with the installation of seven Malaise traps, coordinated by the Conservatoire d'Espaces Naturels de Lorraine (Julien DABRY). (iii) The “tourbière des Charmes” Regional Nature Reserve was investigated in 2014 and 2015 using four Malaise traps, coordinated by the Conservatoire d'Espaces Naturels de Lorraine (Julien DABRY). (iv) During two holiday stays in the Vosges massif, the second author conducted multiple collecting trips focused on Dolichopodidae. During 26-27 July 1993, flies were collected exclusively with a sweep net at three locations, i.e., Lac de Lispach (La Bresse), Lac de Retournemer (Xonrupt-Longemer), and Col de la Schlucht (Le Valtin). Seventeen years later, during 3-9 July 2010, five locations at two localities were investigated: Forêt Communale de Fraize (Plainfaing), La Forêt (Plainfaing), le Ruisseau de la Vallée de Chaume (Plainfaing), Forêt de Retournemer (Xonrupt-Longemer) and Lac de Longemer (Xonrupt-Longemer). At all sites, flies were collected by sweep net. In addition, in La Forêt at Plainfaing, pan traps were also operated in seven adjacent sites during 4-9.vii.2010, with five white traps in one site and five yellow pan traps in the remaining six sampling sites. Trap yields of all five traps per site were pooled into one single sample. The 1993 survey produced eight samples; that of 2010, 43 samples including 36 sweep net samples and seven pooled pan trap samples (Figure 1). Abbreviations: Leg.: collector; coll.: collection; BT: Bruno TISSOT; MP: Marc POLLET; MAPC: private collection of MP; MT: Malaise trap(s); SW: sweep net; WPT: white pan trap(s); YPT: yellow pan trap(s); NR: Nature Reserve. RESULTS The combined five datasets yielded 6,656 specimens of 82 dolichopodid species (Appendix 1). Nineteen female specimens collected by MP could not be identified to species level. The Malaise trap surveys in NR of “tourbière de Machais” produced 1,707 specimens of 34 species, that in NR of “Tanet-Gazon-duFaing” 346 specimens of 17 species, that in NR of “tourbière des Charmes” 171 specimens of 17 species, and those carried out by MP 4,432 of 67 species (Appendix 1). Of the latter specimens, 3,182 were collected by sweep net, and 1,250 by pan traps. Chrysotimus molliculus (Fallén, 1823) (no. of specimens = 6) and Hercostomus pilifer (Loew, 1859) (n = 4) were only collected by yellow pan traps, while only white pan traps captured Medetera brevitarsa Parent, 1927 (n = 7) and M. striata Parent, 1927 (n = 1). During three years of Malaise trap sampling, 34 species were collected in the NR of “tourbière de Machais”, while 37 and 45 species were obtained during short collecting trips at the Lac de Retournemer and in La Forêt (Plainfaing) resp. The dolichopodid fauna of the NR of the “tourbière de Machais” is characterized by species that prefer humid heathlands and/or peat bogs. Next to abundant species like Dolichopus atratus Meigen, 1824, D. atripes Meigen, 1824, D. tanythrix Loew, 1869 and Rhaphium longicorne (Fallén, 1823), also Campsicnemus compeditus Loew, 1857, C. loripes (Haliday, 1832), Dolichopus lepidus Staeger, 1842 and D. vitripennis Meigen, 1824 are typical for these biomes. NR of “tourbière des Charmes” produced some particular species, like the heatland species Diaphorus nigricans Meigen, 1824, and saprun/rotholeinhabiting Systenus bipartitus (Loew, 1850), which represents also the first record for France (see below). Surprisingly, the otherwise very common and widespread Holarctic species Dolichopus plumipes (Scopoli, 1763) was only observed in the NR of “Tanet-Gazon-du-Faing”. This might be explained by the fact that this species prefers open eutrophic marshes and grasslands and is only occasionally found in heathlands and bogs. Four species are recorded for the first time from France: ■ Dolichopus stenhammari Zetterstedt, 1843. Material studied: 25♂, 12♀: Vosges, La Bresse, NR of “tourbière de Machais”, 950 m, 24.vi.2009, leg. BT. D. stenhammari had thus far been recorded from North, Central and Northeastern Europe, and Northwestern Russia. In Europe, its westernmost records orginate from Germany and Switzerland (Pollet 2011). Its nature appears boreo-alpine, i.e., occurring only at high latitude and/or high altitude sites. D. stenhammari is hereby first reported in France from Malaise trap nine in the abovementioned site. With a total number of 37 individuals, the species seemed to thrive in the NR of “tourbière de Machais” in 2009. Since then, we have discovered it in three other acidic peatlands: NR of “tourbières de Frasne-Bouverans” (Doubs, Frasne, alt. 869 m, 1.vi.2017), NR of “Seigne des Barbouillons” (Jura, Mignovillard, alt. 872 m, 4.vi.2019) and NR of “tourbière des Saisies - Beaufortain - Val d’Arly” (Savoie, Hauteluce, alt. 1575 m, 18.vi.2024, 16.vii.2024). It is surprising to note that we did not find the species in several other, apparently suitable, acid peat bogs (notably in the Jura mountains), despite a similar sampling effort (Personal observation). Bulletin de la Société d'Histoire naturelle et d'Ethnographie de Colmar ▪ 2025 ▪ 82 (21) : 157-165 159 ▪ ■ Medetera brevitarsa Parent, 1927. Material studied: 5♂, 2♀: Vosges, Plainfaing, La Forêt (Filipendula ulmaria marshland along small woodland stream in forest edge), 48°10'15.67"N 7°2'6.73"E, 600 m, 4-9.vii.2010, WPT, leg. MP (MAPC). M. brevitarsa belongs to the Medetera signaticornis Loew, 1857 - pinicola Kowarz, 1877 species group, which members are mostly confined to trunks of coniferous trees (Bickel 1985, Pollet et al. 2011). M. brevitarsa seems to deviate from that pattern to some extent and has also been collected in mainly deciduous or mixed forests (Pollet & Grootaert 1987). No specimens were collected in yellow pan traps during the 2010 survey at Plainfaing. Distribution: Belgium, Switzerland, France, Germany (Pollet, unpublished data) and Romania (see Pollet 2011). ■ Syntormon submonilis Negrobov, 1975. Material studied: 6♂, 2♀: Vosges, Plainfaing, La Forêt (sparsely vegetated to sterile ditch bordering running water in forest edge), 48°10'6.60"N 7°2'19.30"E, 600 m, 3.vii.2010, SW, leg. MP; 3♂, same site, 6.vii.2010, SW, leg. MP; 1♂, 2♀, same location, on vegetation and muddy spot in Filipendula ulmaria marshland bordering ditch, 48°10'19.66"N 7°2'7.04"E, 600 m, 9.vii.2010, leg. MP (all deposited in MAPC). S. submonilis had been separated from Syntormon monile (Haliday, 1851) by Parvu (1989) and described as S. silvianum Parvu, 1989, which identity was subsequently questioned by Grichanov (2013). Recently, Drake (2021) discovered that S. silvianum is actually a synonym of S. submonilis. This species prefers inland swamps on limestone soil Table 1 – Details of sites in the Vosges mountains sampled between 1993 and 2021 Locality Municipality Site (X and Y) Altitude Year Author Col de la Schlucht Le Valtin 48°3’45.59”N 7°1’13.36”E 1138 1993 M. POLLET Lac de Retournemer Xonrupt-Longemer 48°3’21.66”N 6°59’1.21”E 777 1993 M. POLLET Lac de Lispach La Bresse 48°3’13.91”N 6°56’22.41”E 915 1993 M. POLLET Forêt Communale de Fraize Plainfaing 48°8'48.18"N 7°2'50.31"E 825 2010 M. POLLET Plainfaing 48°8'48.24"N 7°3'6.95"E 922 2010 M. POLLET Plainfaing 48°9'10.86"N 7°3'45.69"E 900 2010 M. POLLET Plainfaing 48°9'26.88"N 7°3'47.04"E 810 2010 M. POLLET La Forêt Plainfaing 48°10'15.67"N 7°2'6.73"E 660 2010 M. POLLET Plainfaing 48°10'19.66"N 7°2'7.04"E 690 2010 M. POLLET Plainfaing 48°10'6.60"N 7°2'19.30"E 640 2010 M. POLLET Ruisseau de la Vallée de Chaume Plainfaing 48°9'45.80"N 7°2'49.29"E 650 2010 M. POLLET Forêt de Retournemer Xonrupt-Longemer 48°3'20.56"N 6°58'26.09"E 980 2010 M. POLLET Xonrupt-Longemer 48°3'33.37"N 6°57'24.84"E 960 2010 M. POLLET Xonrupt-Longemer 48°3'39.93"N 6°57'51.48"E 755 2010 M. POLLET Xonrupt-Longemer 48°3'9.20"N 6°58'43.23"E 880 2010 M. POLLET Xonrupt-Longemer 48°3'27.66"N 6°59'4.63"E 780 2010 M. POLLET Lac de Longemer Xonrupt-Longemer 48°3'50.23"N 6°57'24.60"E 735 2010 M. POLLET "Tourbière des Charmes" NR Rupt-sur-Moselle 47°57’21.7”N 6°42’09.4”E 865 2014 J. DABRY Rupt-sur-Moselle 47°57’21.9”N 6°42’13.8”E 865 2014 J. DABRY Rupt-sur-Moselle 47°57’18.8”N 6°42’16.7”E 865 2015 J. DABRY Rupt-sur-Moselle 47°57’21.7”N 6°42’09.4”E 865 2015 J. DABRY "Tanet-Gazon-du-Faing" NR Le Valtin 48°6'43.9"N 7°4'1.9"E 1250 2009 J. DABRY & A. VALLET Le Valtin 48°6'40.7"N 7°4'7.3"E 1250 2009 J. DABRY & A. VALLET Plainfaing 48°5'40.9"N 7°3'19.9"E 1220 2009 J. DABRY & A. VALLET Plainfaing 48°5'39.7"N 7°3'26.7"E 1200 2009 J. DABRY & A. VALLET Plainfaing 48°5'46.6"N 7°3'13.7"E 1180 2010 J. DABRY & A. VALLET Plainfaing 48°5'34.8"N 7°3'25.3"E 1225 2010 J. DABRY & A. VALLET Plainfaing 48°5'30.3"N 7°3'20.9"E 1220 2010 J. DABRY & A. VALLET "Tourbière de Machais" NR La Bresse 48°00’31”N 6°57’51”E 1010 2009 C. DRUESNE La Bresse 48°00’19”N 6°57’44”E 985 2009 C. DRUESNE La Bresse 48°00’25”N 6°57’49”E 985 2020 J. CLAUDE La Bresse 48°00’30”N 6°57’43”E 985 2020 J. CLAUDE La Bresse 48°00’46”N 6°57’46”E 1090 2020 A. GÉRARD & A.FOLTZER La Bresse 48°00’19”N 6°57’53”E 980 2020 A. BADRÉ & A. GÉRARD La Bresse 48°00’08”N 6°56’58”E 1048 2021 J. CLAUDE La Bresse 48°00’27”N 6°57’47”E 985 2021 J. CLAUDE La Bresse 48°00’22”N 6°57’53”E 985 2021 J. CLAUDE ▪ Tissot B. & Pollet M. ▪ 160 while S. monile mainly occurs in open coastal marshlands. Distribution: UK, France, Belgium, Romania and Southern European Russia (Pollet 2011). ■ Systenus bipartitus (Loew, 1850) (Figure 2B). Material studied: 1♂: Vosges, Thiéfosse, NR of “tourbière des Charmes”, 1♂, 7.vii.2015, MT, leg. BT. This is the first observation in France. Since then, we have discovered the species four more times in France: 1♂: Corse-du-Sud (2A), Zicavo, Ponte di Valpine (on rocks in bed of river), 41°52'27.0"N 09°08'08.3"E, 1283 m, 25-29.vi.2019, YPT, leg. MP; Yonne, Mailly-le-Chateau, NR of “Bois du Parc”, 152 m, 19.vi.2020, MT, leg. BT; HauteSaône, Frotey-les-Vesoul, NR of “Sabot de Frotey”, 309 m, 3.ix.2024, MT, leg. BT; Indre, Saint-Michel-en-Brenne, Forêt de Monplaisir, 90 m, 8.x.2024, MT, leg. BT. Distribution: Palaearctic species, in Europe also recorded from neighbouring UK, Belgium and Germany. Like all other European species in this genus, S. bipartitus breeds in the sap runs and rot holes of deciduous trees and, for that reason, is not often collected with the usual methods (sweep net, Malaise and pan traps). This might also explain its apparent rarity. It has been recorded from different tree species (Pollet & Meuffels 2023). Other species discovered during the abovementioned surveys have been recorded from France before but might be of faunistic interest. Data on the rarity of Dolichopodidae in France, however, are not available so we were obligated to base our assessment on the current rarity of the species as established in Flanders (northern Belgium) (Pollet & Meuffels 2023). Current rarity is here expressed as the number of UTM 5km squares with the species / total number of investigated UTM 5 km squares since 1981. That year marks the onset of Malaise and pan trap use for the collection of flies in Belgium (see also Pollet & Grootaert 2023): (i) Campsicnemus alpinus (Haliday, 1833) (rare), C. armoricanus Parent, 1926 (rare), C. compeditus (rare), and Syntormon sulcipes (Meigen, 1824) (extremely rare) are confined to oligotrophic environments where each species displays a particular habitat affinity, with the first two species preferring open shallow borders of fens, C. compeditus moist ditches and S. sulcipes peaty sites. (ii) Medetera dichrocera Kowarz, 1877 is mainly found on tree trunks of coniferous trees, like most of the other species of the M. signaticornis - pinicola species group. Not yet recorded from Belgium nor the Netherlands. (iii) Rhaphium albomaculatum (Becker, 1891) is a species of riparian habitats (banks of lakes and ditches) at high altitude in Central Europe. Not yet recorded from Belgium nor the Netherlands. Figure 1 – Selection of sampling sites during the 2010 entomological survey (MP) A. largely bare pebbly banks of Lac de Retournemer (Xonrupt-Longemer); B. same site, with dense vegetation of e.g., Potentilla palustris; C. pan trap site at La Forêt (Plainfaing); D. same site, detail of yellow pan trap after five days of operation. [Photo credits: Marc POLLET]. Bulletin de la Société d'Histoire naturelle et d'Ethnographie de Colmar ▪ 2025 ▪ 82 (21) : 157-165 161 ▪ (iv) Syntormon tarsatum (Fallén, 1823) (very rare) is a species that is mainly found in reed marshes and Filipendula ulmaria swamps. It was rather abundant in a wooded marshland at the Lac de Retournemer (Gérardmer). Not yet recorded from the Netherlands. DISCUSSION Sweep nets and Malaise traps are the most widely used techniques to collect flying insects. Pan traps, on the contrary, have become a standard part of the array of collecting methods in large scale inventories only recently (Touroult et al. 2018, 2023). They are very effective in capturing dolichopodids, especially soildwelling species. E.g., Campsicnemus Haliday in Walker, 1851 and Hydrophorus Fallén, 1823 species are more readily collected in high numbers in pan traps than in Malaise traps. As a matter of fact, seven Malaise trap campaigns only delivered eight specimens of three Campsicnemus species (see Appendix 1), despite the fact that oligotrophic biotopes have a rather rich Campsicnemus fauna. Blue pan traps mainly attract arboreal species in e.g., Medetera, Systenus Loew, 1857, and Neurigona Rondani, 1856, yellow pan traps are favoured by most other species, while white traps produce a mix of arboreal and nonarboreal species (Pollet & Meuffels 2023). The discovery of two Medetera species, M. brevitarsa and M. striata Parent, 1927, in the white but not the yellow pan traps is therefore no surprise. CONCLUSION AND PERSPECTIVES This work on the valorisation of non-target fauna in three protected areas of the Vosges massif, as well as personal surveys by the second author, has allowed the generation of a first check list of Dolichopodidae of the Vosges department. These approaches have led to numerous discoveries and a very important and unprecedented advance in the dipterological knowledge of the Vosges massif. They allow both to document the knowledge on protected natural sites and contribute to local knowledge. This work also allowed the discovery of four species recorded from France for the first time: Dolichopus stenhammari, Medetera brevitarsa, Syntormon submonilis and Systenus bipartitus. It is without any doubt that the dolichopodid species richness in the Vosges is much higher than the current check list of 82 species seems to suggest. Switzerland holds 300 species (Pollini et al. 2025), Germany 424 (Meyer & Stark 2015) while 414 species have been recorded from the entire territory of France (TAXREF 2025, after adjustment and including the four additional species recorded here). Considering the wide array of biotopes present in this department, ranging from oak, beech and fir forests, over humid biotopes like heathlands, peat bogs, marshes and meadows to dry rocky outcrops and grasslands, and aquatic environments (stagnant and running waterbodies and mountain lakes), the current number could well be doubled using the right strategy. In this respect, Meyer & Stark (2015) list 121 species from nearby Baden-Württemberg (Germany). About 20% of the French dolichopodid species has thus far been encountered in the Vosges. This percentage applies to the ten most species rich dolichopodid genera combined, as well as to the 38 less species rich genera combined. Within the first group, representations in the Vosges range from 45% in Campsicnemus spp. (9/20 species) to none in Tachytrechus Haliday in Walker, 1851 spp. (0/10 species). Moreover, 25 out of 48 dolichopodid genera known from France have thus far not been discovered in the Vosges. The fact that also a number of rather common and widespread European species are currently lacking in the Vosges check list, in particular in the genera Dolichopus Latreille, 1796, Hercostomus Loew, 1857, Medetera, Rhaphium Meigen, 1803, Chrysotus Meigen, 1824 and Sciapus Zeller, 1842, only confirms that there is still a long way to acquire a reliable idea on this species group in this department. But gains can be made quite quickly. To increase the number of species in the check list swiftly, the best strategy would be to (i) focus on biotopes that have been undersampled thus far and (ii) apply collecting methods that are most productive in terms of species collected. While peat bogs have been readily investigated, other biotopes like dry grasslands and rocky outcrops, different forest types and riparian habitats Figure 2 – Some Dolichopodidae identified during this study A. Anepsiomyia flaviventris (Meigen, 1824), male (Portugal). [Photo credits: Rui ANDRADE]; B. Systenus pallipes (von Roser, 1840), a relative of Systenus bipartitus (Loew, 1850), female (Portugal). [Photo credits: Rui ANDRADE]. ▪ Tissot B. & Pollet M. ▪ 162 have received much less attention in the past. And while Malaise traps have been widely used and remain an important collecting method for flying insects overall, they are less suitable than pan traps to collect soil-dwelling species in particular sites e.g., reed marshes, forests with dense undergrowth. E.g., no Hydrophorus species were collected with Malaise traps in the Vosges and only two with sweep nets, despite the fact that peat bog and humid heathland areas, especially at higher altitudes, house several species of this genus. But even pan traps are not the solution to assess the diversity of some species groups of special microhabitats like tree trunks. At present only four of 47 species of Medetera recorded from France have been collected in the Vosges, despite the presence of vast and diverse forests. These species can best be collected by hand as described in Pollet & Meuffels (2023), or with tree eclectors (Pollet et al. 2025). Acknowledgements – We would like to thank Alix GREUZAT BADRÉ (Parc Naturel Régional des Ballons des Vosges) and Jocelyn CLAUDE for making this inventory possible, Julien DABRY and Thibault HINGRAY (Conservatoire d’espaces naturels de Lorraine) for entrusting us with the determination of Dolichopodidae of NR of “Tanet-Gazon-du-Faing” and “tourbières des Charmes”. Part of the material treated during this study (Systenus bipartitus) was collected during the naturalist expedition, “La Planète Revisitée (Our Planet Reviewed) – Corsica 2019-2021”. This survey was organised by the Muséum national d’Histoire naturelle (MNHN, Paris) in collaboration with and funded by the Collectivité de Corse (CdC) and the Office Français de la Biodiversité (OFB). We are also grateful to the logistical partners who assisted with fieldwork in 2020: the Office de l’Environnement de la Corse (OCIC and CBNC), the Direction Régionale de l’Environnement de l’Aménagement et du Logement (DREAL) and the Conservatoire du Littoral (CdL). The second author who acted as Diptera coordinator during this survey is indebted to the leaders of the expedition, Julien TOUROULT, François DUSOULIER and Jean ICHTER, for the thorough preparation and guidance. He is also grateful to the other members of the research team for the exchange of valuable samples. Thanks also to Paul BEUK (Netherlands) and Thibault RAMAGE (France) for assistance in sample processing. Rui ANDRADE (Portugal) kindly provided us with the high-quality pictures of alive dolichopodid specimens. And finally, Andreas STARK (Germany) and Magnus PERSSON (Sweden) reviewed an earlier version of the paper and provided us with valuable comments. BIBLIOGRAPHIE Bickel D.J. 1985. A revision of the Nearctic Medetera (Diptera: Dolichopodidae). U.S. Department of Agriculture, Technical Bulletin, 1692 : 1-109. Bickel D.J. & Hernandez M.C. 2004. Neotropical Thrypticus (Diptera: Dolichopodidae) Reared from Water Hyacinth, Eichhornia crassipes, and Other Pontederiaceae. Annals of the Entomological Society of America, 97 (3) : 437-449. Claude J., Badré A. & Gérard A. 2025. Introduction à l’inventaire de l’entomofaune (Arthropoda, Insecta & Arachnida) de la Réserve naturelle nationale de la tourbière de Machais (France, Grand Est, Vosges) par piège à interception de type Malaise entre 2009 et 2021. Bulletin de la Société d'Histoire naturelle et d'Ethnographie de Colmar, 82 (1) : 1-9. doi:10.5281/zenodo.15201815 De Leon D. 1935. A study of Medetera aldrichii Wh. (Diptera - Dolichopodidae), a predator of the mountain pine beetle (Dendroctonus monticolae Hopk., Coleo. - Scolytidae). Entomologica Americana, 15 (2) : 59-91. Drake C.M. 2021. Comments on the taxonomic status of some British species of Syntormon Loew, 1857 (Diptera, Dolichopodidae). Dipterists Digest, 28 : 17-44. Dyte C.E. 1959. Some interesting habitats of larval Dolichopodidae (Diptera). Entomologist's monthly Magazine, 95 : 139-143. Grichanov I.Y. 2013. Systematic notes on West-Palaearctic species of the genus Syntormon (Diptera: Dolichopodidae). In : Grichanov, I.Y. & Negrobov, O.P. (eds). Fauna and taxonomy of Dolichopodidae (Diptera). Collection of papers. VIZR RAAS, 2013. Plant Protection News, Supplement 9 : 3-26. Available from: https://archive.org/ details/GrichanovNegrobovDolichopodidae2013/page/n1/mode/2up Grichanov I.Y. 2017. Alphabetic list of generic and specific names of predatory flies of the epifamily Dolichopodoidae (Diptera). 2nd ed. St. Petersburg: VIZR Plant Protection News, Supplement 23 : 1-563. doi:10.5281/zenodo.884863 Kenis M., Wermelinger B. & Grégoire J.-C. 2004. Chapter 11. Research on parasitoids and predators of Scolytidae—A review. In : Lieutier F., Day K.R., Battisti A., Grégoire J.-C. & Evans H.F. (eds.). Bark and Wood Boring Insects in Living Trees in Europe. A Synthesis. Springer, Dordrecht, The Netherlands : 237–290. Meyer H. & Stark A. 2015. Verzeichnis und Bibliografie der Tanzfliegenverwandten Deutschlands (Diptera: Empidoidea, Atelestidae, Brachystomatidae, Dolichopodidae s.l., Empididae, Hybotidae, "Iteaphila-Gruppe", Oreogetonidae). Studia dipterologica, Supplement 19 : 1-376. Halle/S., Ampyx Verlag. Parvu C. 1989. New contribution to the knowledge of Dolichopodidae (Diptera) of Romania (VI) with the description of two new species: Syntormon silvianus n. sp. and Asyndetus negrobovi n. sp. Travaux du Muséum national d'Histoire naturelle "Grigore Antipa", 30 : 57-65. Pollet M. 2000. A documented Red List of the dolichopodid flies (Diptera: Dolichopodidae) of Flanders [in Dutch with English summary]. Communications of the Institute of Nature Conservation, 8 : 1-190. Brussels. Pollet M. 2009. Diptera as ecological indicators of habitat and habitat change. In: Pape T., Bickel, D. & Meier, R. (eds.). Diptera Diversity: Status, Challenges and Tools. Koninklijke Brill NV : 302-322. Pollet M. 2011. Fauna Europaea: Dolichopodidae. [Accessed July 15, 2022]. In : Pape T, Beuk P. (eds). Fauna Europaea: Diptera, Brachycera. Fauna Europaea version 2.4. Available from: https://www.eu-nomen.eu/portal/taxon.php?GUID=urn:lsid:marinesp ecies.org:taxname:150930. Pollet M. & Brooks S.E. 2008. Long-Legged Flies (Diptera: Dolichopodidae). In : Capinera, J.L. (Ed.). Encyclopedia of Entomology. 2nd Edition. Springer : 2232-2241. Pollet M., Drake C.M., Jacobs M. & Stark A. 2025. Discovery of Two New European Tree Trunk-Dwelling Medetera Species (Diptera: Dolichopodidae). Taxonomy, 5 (1) : 7. doi:10.3390/taxonomy 5010007 Pollet M., Germann C. & Bernasconi M.V. 2011. Phylogenetic analyses using molecular markers reveal ecological lineages in Medetera (Diptera: Dolichopodidae). Canadian Entomologist, 143 : 662-673. doi:10.4039/n11-031 Pollet M. & Grootaert P. 1987. Ecological data on Dolichopodidae (Diptera) from a woodland ecosystem. I. Colour preference, detailed distribution and comparison between different sampling techniques. Bulletin de l'Institut royal des Sciences naturelles de Belgique, Entomologie, 57 : 173-186. Pollet M. & Grootaert P. 2023. The Botanic Garden Jean Massart (Brussels-Capital Region): a hotspot for long-legged flies (Diptera: Dolichopodidae) in Belgium or not? In: Grootaert P. & Drumon A. (Eds). Flies in the centennial Botanic Garden Jean Massart Bulletin de la Société d'Histoire naturelle et d'Ethnographie de Colmar ▪ 2025 ▪ 82 (21) : 157-165 163 ▪ (Brussels-Capital Region, Belgium). Belgian Journal of Entomology, 134 : 19-38. Pollet M. & Meuffels H. 2023. Verspreidingsatlas van Nederlandse slankpootvliegen (Diptera: Dolichopodidae). EIS Kenniscentrum Insecten en andere ongewervelden, Leiden, 349 pp. Available on https://natuurtijdschriften.nl/pub/1024284/Slankpootvliegen_DEF_co mpleet.pdf Pollini Paltrinieri L., Pollet M., Merz B. & Chvála M. 2025. Dolichopodidae (incl. Microphorinae) (last update: Jul 2024). In: Haenni J.‑P., Bächli G., Bernasconi M., Dufour C., Fisler L., Gonseth Y., Lods‑Crozet B., Monnerat C. & Pollini Paltrinieri L. (eds.) 2024. Diptera – Checklist. Fauna Helvetica, 35 : 274-298. info fauna & Société entomologique de Genève, Neuchâtel, 590 pp. Available on https://www.infofauna.ch/sites/default/files/files/publica tions/FaunaHelvetica35_Diptera_Checklist_Dolichopodidae.pdf TAXREF 2025. TAXREF v18.0, référentiel taxonomique pour la France. PatriNat (OFB-CNRS-MNHN-IRD), Muséum national d'Histoire naturelle, Paris. Available on https://inpn.mnhn.fr/ telechargement/referentielEspece/taxref/18.0/menu Touroult J., Pollet M. & Pascal O. 2018. Overview of Mitaraka survey: research frame, study site and field protocols. In Touroult J. (Ed.) “Our Planet Reviewed” 2015 large-scale biotic survey in Mitaraka, French Guiana. Zoosystema, 40 (13) : 327-365. doi:10.5252/zoosystema2018v40a13 Touroult J., Ichter J., Pollet M., Pascal O., Poirier E., Rougerie R., Decherf B., Andrei-Ruiz M.-C., Hugot L. & Dusoulier F. 2023. Our Planet Reviewed in Corsica 2019-2021: a large-scale survey of neglected biodiversity on a Mediterranean island. Bulletin de la Société entomologique de France, 128 (4) : 353-382. doi:10.32475/bsef_2285 Ulrich H. 2004. Predation by adult Dolichopodidae (Diptera): a review of literature with an annotated prey-predator list. Studia dipterologica, 11 (2) : 369-403. Soumis le 5 novembre 2025│Publié le 12 décembre 2025 doi:10.5281/zenodo.17763080 ▪ Tissot B. & Pollet M. ▪ 164 APPENDIX 1  CHECK LIST OF DOLICHOPODIDAE OF THE VOSGES MASSIF, WITH NUMBERS (SUM OF RELIABLY IDENTIFIED MALES AND FEMALES) PROVIDED PER DATASET. Abbreviation use in the table: TC "Tourbière des Charmes" NR, TGF "Tanet-Gazon-du-Faing" NR, TM "Tourbière de Machais" NR; ¥ species new to France Species TC TGF TM MP surveys Number of specimens 2014-2015 2009-2010 2009-2020-2021 1993 2010 Achalcus flavicollis (Meigen, 1824) - 1 - 1 - 2 Anepsiomyia flaviventris (Meigen, 1824) (Figure 2A) - - 1 - 179 180 Argyra argentina (Meigen, 1824) - - - - 2 2 Argyra auricollis (Meigen, 1824) - - - 1 26 27 Argyra diaphana (Fabricius, 1775) - 1 - - 15 16 Argyra leucocephala (Meigen, 1824) - - - - 1 1 Argyra perplexa Becker, 1918 - - - - 5 5 Campsicnemus alpinus (Haliday, 1833) - - - 1 - 1 Campsicnemus armoricanus Parent, 1926 - - - 3 2 5 Campsicnemus compeditus Loew, 1857 - - 2 1 - 3 Campsicnemus curvipes (Fallén, 1823) - - 4 25 60 89 Campsicnemus loripes (Haliday, 1832) - 1 1 8 56 66 Campsicnemus lumbatus Loew, 1857 - - - 2 - 2 Campsicnemus marginatus Loew, 1857 - - - 1 - 1 Campsicnemus scambus (Fallén, 1823) - - - 1 - 1 Campsicnemus umbripennis Loew, 1856 - - - 1 1 2 Chrysotimus molliculus (Fallén, 1823) - - - - 6 6 Chrysotus gramineus (Fallén, 1823) - - 6 13 43 62 Chrysotus obscuripes Zetterstedt, 1838 - - - 29 - 29 Chrysotus suavis Loew, 1857 - - - 1 - 1 Diaphorus nigricans Meigen, 1824 1 - - - 1 Diaphorus oculatus (Fallén, 1823) - - 1 3 - 4 Dolichopus atratus Meigen, 1824 - 72 510 2 - 584 Dolichopus atripes Meigen, 1824 1 - 206 20 74 301 Dolichopus campestris Meigen, 1824 - - - - 9 9 Dolichopus lepidus Staeger, 1842 11 3 10 6 17 47 Dolichopus nigricornis Meigen, 1824 27 152 237 4 267 687 Dolichopus picipes Meigen, 1824 - - - - 11 11 Dolichopus plumipes (Scopoli, 1763) - 1 - - 1 Dolichopus popularis Wiedemann, 1817 - 1 - 1 96 98 Dolichopus rupestris Haliday, 1833 3 7 - - 10 Dolichopus signatus Meigen, 1824 - 1 1 - - 2 Dolichopus stenhammari Zetterstedt, 1843 ¥ - - 37 - - 37 Dolichopus tanythrix Loew, 1869 16 - 105 22 4 147 Dolichopus trivialis Haliday, 1832 - - - 1 - 1 Dolichopus ungulatus (Linnaeus, 1758) - - 1 3 32 36 Dolichopus urbanus Meigen, 1824 - 61 3 - 31 95 Dolichopus vitripennis Meigen, 1824 13 1 2 9 14 39 Ethiromyia chalybea (Wiedemann, 1817) - - - - 1 1 Gymnopternus aerosus (Fallén, 1823) 2 - 14 87 1 121 1 224 Gymnopternus brevicornis (Staeger, 1842 ) 3 - 6 25 1 358 1 392 Gymnopternus celer (Meigen, 1824) - - 1 8 187 196 Gymnopternus cupreus (Fallén, 1823) - 1 - - 129 130 Hercostomus chetifer (Walker, 1849) - - - - 23 23 Hercostomus longiventris (Loew, 1857) - - - - 17 17 Hercostomus pilifer (Loe w, 1859) - - - - 4 4 Hercostomus vivax (Loew, 1857) - 12 6 - - 18 Hydrophorus bipunctatus (Lehmann, 1822) - - - 1 21 22 Hydrophorus praecox (Lehmann, 1822) - - - - 26 26 Liancalus virens (Scopoli, 1763) - - 1 2 3 6 Medetera brevitarsa Parent, 1927 ¥ - - - - 7 7 Bulletin de la Société d'Histoire naturelle et d'Ethnographie de Colmar ▪ 2025 ▪ 82 (21) : 157-165 165 ▪ Species TC TGF TM MP surveys Number of specimens 2014-2015 2009-2010 2009-2020-2021 1993 2010 Medetera dichrocera ( Kowarz, 1877 ) - - 1 - - 1 Medetera jacula (Fallén, 1823) - - - - 1 1 Medetera striata Parent, 1927 - - - - 1 1 Melanostolus melancholicus (Loew, 1869) - - - - 1 1 Neurigona erichsoni (Zetterstedt, 1843) - - - - 1 1 Neurigona pallida (Fallén, 1823) 8 - 19 - - 27 Neurigona quadrifasciata (Fabricius, 1781) 1 3 6 - 25 35 Neurigona suturalis (Fallén, 1823) - - 1 - - 1 Poecilobothrus chrysozygos (Wiedemann, 1817) - - - - 25 25 Rhaphium albifrons Zetterstedt, 1843 - - - 1 - 1 Rhaphium albomaculatum (Becker, 1891) - - 5 - - 5 Rhaphium appendiculatum Zetterstedt, 1849 - - - - 9 9 Rhaphium auctum Loew, 1857 - - - - 50 50 Rhaphium elegantulum (Meigen, 1824) - - 1 - - 1 Rhaphium ensicorne Meigen, 1824 - - 1 - 3 4 Rhaphium longicorne (Fallén, 1823) 83 26 506 - - 615 Rhaphium monotrichum Loew, 1850 - - - 1 1 2 Sciapus platypterus (Fabricius, 1805) 1 - 1 - 14 16 Sybistroma crinipes Staeger, 1842 - - - - 3 3 Sybistroma obscurellus (Fallén, 1823) - - - - 20 20 Sympycnus aeneicoxa (Meigen, 1824) - - - 57 11 68 Sympycnus cirripes (Haliday, 1851) - - - 1 2 3 Sympycnus pulicarius (Fallén, 1823) - - - 1 20 21 Syntormon denticulatum (Zetterstedt, 1843) - - 2 1 4 7 Syntormon submonilis Negrobov, 1975 ¥ - - - - 14 14 Syntormon sulcipes (Meigen, 1824) - 2 6 3 3 14 Syntormon tarsatum (Fallén, 1823) - - - 27 - 27 Syntormon zelleri (Loew, 1850) - - 1 - - 1 Systenus bipartitus (Loew, 1850) ¥ 1 - - - - 1 Systenus pallipes (Roser, 1840) (Figure 2B) - - 2 - - 2 Xanthochlorus ornatus (Haliday, 1832) - - - - 2 2 No. of species 14 17 34 37 54 82 No. of specimens 171 346 1 707 374 4 058 6 656