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SPIXIANA 39 111-13 München, Sep embe 2016 ISSN 0341-8391
A new species o he genus Gonyos omus om B azil
(Gas opoda, S ylomma opho a, S ophocheilidae)
Luiz Rica do L. Simone
Simone, L. R. L. 2016. A new species o he genus Gonyos omus om B azil
(Gas opoda, S ylomma opho a, S ophocheilidae). Spixiana 39 (1): 11-13.
Gonyos omus elinae is a new species collec ed om he Caboclos egion o São
Paulo, B azil, ex ending he dis ibu ion o he genus sou h o he ca e n en i on-
men o he cen al A lan ic ain o es . The new species di e s om he o he h ee
species in he genus in ha ing a di e en colou pa e n o he shell, a wide um-
bilicus, smoo he sculp u e, and a wide ape u e ha ing a s aigh inne lip. The
species can be al eady classi ied as endange ed.
Luiz Rica do L. Simone, Museu de Zoologia da Uni e sidade de São Paulo, Cx
Pos al 42494, 04299-970 São Paulo, SP, B azil;
e-mail: [email p o ec ed], [email p o ec ed]
In oduc ion
The genus Gonyos omus Beck, 1837 is endemic o
sou heas e n B azil, li ing in humid A lan ic ain o -
es . The genus is in equen , and samples ha e been
collec ed a ely. Because o ana omical cha ac e s,
such as he absence o u e e (Leme 1973, 1975), he
genus is placed wi hin he S ophocheilidae, despi e
conchological simila i y wi h some o halicids.
Only h ee species a e known in he genus:
Gonyos omus gonios omus (Fe ussac, 1821), he ype
species, occu ing in he cen al egion o Rio de
Janei o s a e; G. insula is Leme, 1974, is endemic o
Buzios Island, São Paulo; and G. eg egius (P ei e ,
1845), which occu s in he sou he n Rio de Janei o
and no he n São Paulo s a es (Leme 1974, Simone
2006).
Recen ly he Museum o Zoology o he Uni-
e si y o São Paulo (MZSP) ecei ed an impo an
collec ion o molluscs collec ed in ca es h oughou
B azil, by Ma ia Elina Bichue e and he eam o he
Fede al Uni e si y o São Ca los. In ha collec ion,
h ee samples wi h a o al o ou specimens om a
ca e a ea in sou he n São Paulo appea ed o belong
o he uncommon genus Gonyos omus. Analysis o
his ma e ial e ealed ha hey belong o a single
new species, o mally desc ibed he ein. This expands
he known geog aphic ange o he genus owa ds
he sou h.
Ma e ial and me hods
All samples a e d y shells collec ed inside ca es, pos-
sibly ca ied inside by ainwa e . The ype ma e ial o
he h ee p e iously known species o Gonyos omus we e
examined, and a e igu ed elsewhe e (Simone 2006: 202-
203).
Sys ema ics
Gonyos omus elinae spec. no .
Figs 1-7
Type ma e ial. Holo ype: MZSP 106226 (s a. LES2205)
(Figs 1-4). Pa a ypes: MZSP 106237, 1 shell om ype
locali y (s a. LES2204) (Fig. 5); MZSP 104837, 2 shells o
unce ain locali y (possibly same as he ype locali y)
(s a. LES2068) (Figs 6-7).
Type locali y. B azil, São Paulo, Caboclos Region,
Ipo anga, PETAR (Al o do Ribei a S a e Pa k), Chapéu
Mi im Ca e, 24°25'52" S 48°35'07" W (Bichue e e al.
leg., 15. i.2008).
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Diagnosis. Shell backg ound colou pale beige o
c eam, wi h b ownish-pu ple blo ches occupying
~40 % o su ace. Sculp u e axially elonga ed, minu e
nodes a anged in spi al ows (9-10 on penul ima e
who l). Ape u e wide, wi h ela i ely s aigh inne
lip. Umbilicus wide o genus.
Desc ip ion
Shell (Figs 1-6). Ou line usi o m; heigh abou
47 mm, wid h ~42 % o leng h; ~5.5 who ls (Fig. 4).
Backg ound colou pale beige o c eam, wi h b own
o b ownish-pu ple ma kings, blo ches, occupying
~40 % o su ace; blo ches i egula ly a anged in
spi al pa e n, esul ing in 4 equidis an bands on
las who l (Fig. 2). Lowe pa o body who l de oid
o colou ma kings; in ape u al iew (Figs 1, 5, 6)
la ge, ligh -colou ed egion, well delimi ed by
dis inc , oblique line beginning a junc ion o colu-
mella and pa ie al a eas, ex ending downwa ds,
joining whi e pe is ome; in do sal and basal iews
(Figs 2-3, espec i ely), ligh -colou ed a ea o ming
spi al ligh colou band su ounding umbilicus.
P o oconch o 1.5 who ls, ounded p o ile, wi h
la ened supe io su ace, weakly ca ina e in supe-
io egion, sculp u ed by delica e ne o axial and
spi al lines (Fig. 7), ~10 spi al lines on i s who l;
occupying ~15 % o supe io shell su ace in apical
iew (Fig. 4); diame e ~3.5 mm. Spi e acumina e,
occupying ~55 % o shell leng h; spi e angle ~35-40 °;
su u e shallow, who ls weakly con ex. Teleoconch
sculp u e o well-de eloped g ow h-lines and axial
undula ions; su ace addi ionally w inkled by small,
axially elonga ed nodes on op o undula ions, a -
anged successi ely in spi al lines, ~9-10 on penul-
ima e who l (Fig. 2); each node ~3 imes as long as
wide. Body who l occupying ~2
/3 o shell leng h,
no mo e elonga ed han p e ious who ls. Ape u e
comple ely whi e, ~ wice longe han wide, ellip ical;
an e io no ch well-de eloped, almos siphon-like,
an e io ly di ec ed (Fig. 3); ou e lip weakly con ex,
edge hick, expanded, he eby inc easing shell wid h
~15 %; edge weakly na owe supe io ly, g adually
becoming wide in in e io po ion (Figs 1, 5, 6); edge
hinne in an e io no ch; supe io hal o inne lip
almos s aigh , callus hin, anslucen (Figs 1, 5, 6),
in e io hal simila o ou e lip, almos s aigh and
wi h uni o m wid h along i s leng h. Umbilicus ela-
i ely wide (Fig. 3), pa ially co e ed by expansion o
inne lip; possessing shallow spi al ma ginal u ow.
Measu emen s (in mm). Holo ype: 46.9 by 20.0;
MZSP 106237: 46.2 by 20.1; MZSP 104837 #1: 40.9
by 18.4; #2: 36.2 by 15.2 (subadul specimen wi hou
expanded pe is ome).
Habi a . Found dead inside ca es, possibly ca -
ied in by loods, so, conside ed acciden al in he
ca es, ha ing come om epigean, possibly a bo eal
en i onmen .
Dis ibu ion. Known only om he ype locali y.
E ymology. This species is named a e Ma ia Elina
Bichue e, Uni e sidade Fede al de São Ca los, who is
leading a eam conduc ing ex ensi e p ojec s on ca e
aunas and has dona ed se e al mollusc samples esul-
ing in a signi ican imp o emen o ou knowledge o
he B azilian malaco auna.
Figs 1-6. Gonyos omus elinae new species. 1. Holo ype MZSP 106226, ape u al iew (L 46.9 mm). 2. Same, do sal
iew. 3. Same, basal iew. 4. Same, apical iew. 5. Pa a ype MZSP 106237, ape u al iew (L 46.2 mm). 6. Pa a ype
MZSP 104837#1, ape u al iew (L 40.9 mm). 7. De ail o apex in p o ile, MZSP 104837#2 (wid h a cu -o = 8 mm).
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Discussion
Gonyos omus elinae can be dis inguished om G. go-
nios omus and G. insula is in ha ing a much wide
umbilicus, blo chy colou pa e n (ins ead o a uni-
o m b own colou ), and mo e uni o m g ow h o
spi e ( hose species ha e some a ia ion o he axis o
he i s who ls) (see Simone 2006: 203, igs 763-764).
G. elinae is mo e simila o G. eg egius, sha ing wi h i
he blo chy colou pa e n and he open umbilicus;
G. elinae di e s om G. eg egius in ha ing a blun e
p o oconch wi h mo e de eloped ca ina in he i s
who l (Fig. 7), mo e delica e p o oconch sculp u e,
blo ches on shell colou o ming wide bands ( hose
o G. eg egius a e minu e and mo e spa se, see Simone
2006: 202, ig. 762), and in ha ing he las who l mo e
uni o m in ela ion o spi e, while he las who l o
G. eg egius is clea ly b oade han expec ed i he
spi e g ow h was uni o m. Addi ionally, Gonyo-
s omus elinae has a wide, ligh colou ed spi al band
(i. e. no ma kings) in he basal pa o he body who l
(a ound he umbilicus) (Figs 1, 5, 6); he h ee o he
species ha e an unin e up ed pa e n o colou all
he way down o he pe iumbilical a ea (Simone 2006:
202-203). The new species has a comple ely whi e
pe is ome, which is conside ably mo e expanded
han in he h ee p e iously known Gonyos omus.
They ha e less expanded pe is ome, wi h ligh o
da k pink pigmen a ion.
Despi e he lack o in o ma ion on he so pa s,
he gene ic a ibu ion o he new species o Gonyos o-
mus is ela i ely simple. The ounded and sculp u ed
p o oconch is ypical o he genus, local o halicids
cha ac e is ically possess mo e poin ed p o oconchs.
The ounded p o oconch and he an e io ly angu-
la e ape u e, ypical o Gonyos omus, es ic he
compa ison o ew local o halicid gene a. The new
species canno be a ibu ed o Mo icandia Pilsb y &
Vana a, 1898 because i is lacking he cha ac e is ic
club-shaped ou line o ha genus, whose las who l
is na owe han he middle po ion o he shell, and
in lacking a clea old a he junc ion o he pa ie al
and columella po ions o he inne lip. I canno
be a ibu ed o he genus Eudolicho is Pilsb y, 1896
(which only occu s in he in sup a-Amazon egion
o no he n Sou h Ame ica), in being much mo e
elonga ed, in lacking he cha ac e is ic dome-shaped
spi e, and in lacking a ans e se old in middle le el
o he inne lip.
The genus Gonyos omus was p e iously con-
side ed endemic o Sou heas e n B azil, occu ing
nea Espí i o San o, Rio de Janei o and São Paulo.
The p esen eco ds o G. elinae a e he i s occu -
ence in sou he n São Paulo, ex ending he known
dis ibu ion o he genus by ~200 km sou hwa d o
he ca e en i onmen o he middle egion o he
A lan ic ain o es .
The desc ip ion o new species o B azilian land
snails is ou ine (e. g. Simone 2012, 2013), demons a -
ing ha he egional malaco auna is s ill only poo ly
known. P ese a ion e o s a e u gen ly necessa y
in all na u al places, in o de o p o ec he species
ha a e no ye known. The ca e a ea o sou h São
Paulo has been shown pa icula ly ich in e es ial
species, and he desc ip ion o he new species p o-
ides addi ional mo i a ion o p ese a ion o he
PETAR (Pa que Es adual Tu ís ico do Al o Ribei a,
o Tou is ic S a e Pa k o High Ribei a Ri e ) egion.
Based on he sca ci y o he ma e ial, he new species’
geog aphic es ic ion, and because he su ound-
ing a ea has been de as a ed o plan a ions and
ag icul u e, G. elinae can be al eady classi ied as
endange ed.
Acknowledgemen s
I hank Ma ia Elina Bichue e, DEBE, Uni e sidade Fe-
de al de São Ca los, o he dona ion o he specimens
s udied he ein, and o help ul commen s on he pape
and en i onmen al da a. I hank he edi o and he wo
anonymous e e ees o use ul commen s on he pape .
FAPESP (p ocesses 2003/00795-1 and 2008/05678-7)
inancially suppo ed M. E. Bichue e’s ield wo k.
Specimens we e collec ed unde IBAMA license 10215
and 28992-1.
Re e ences
Leme, J. L. M. 1973. Ana omy and sys ema ics o he
Neo opical S ophocheiloidea (Gas opoda, Pul-
mona a) wi h he desc ip ion o a new amily.
A qui os de Zoologia 23: 295-337.
– – 1974. Gonyos omus insula is, uma no a espécie de
S ophocheilidae (Pulmona a) da Ilha de Búzios, São
Paulo, B asil. Papéis A ulsos de Zoologia 28: 1-9.
– – 1975. Ensaios ilogené icos em Pulmona a e sua
impo ância na no a concei uação da supe amília
S ophocheiloidea (Gas opoda, S ylomma opho a).
A qui os do Museu Nacional 55: 79-84.
Simone, L. R. L. 2006. Land and eshwa e molluscs o
B azil. 390 pp., São Paulo (EGB, FAPESP).
– – 2012. A new genus and species o ca e nicolous Po-
ma iopsidae (Mollusca, Caenogas opoda) in Bahia,
B azil. Papéis A ulsos de Zoologia 52: 515-524.
– – 2013. Habeas, a new genus o Diplomma inidae
om cen al Bahia, B azil (Caenogas opoda), wi h
desc ip ion o h ee new species. Jou nal o Con-
chology 41: 519-525.
