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A New Genus and Species of Cavernicolous Pomatiopsidae (Mollusca, Caenogastropoda) in Bahia, Brazil

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A New Genus and Species of Cavernicolous Pomatiopsidae (Mollusca, Caenogastropoda) in Bahia, Brazil Universidade de São Paulo Biblioteca Digital da Produção Intelectual - BDPI Sem comunidade Scielo 2012 A new genus and species of cavernicolous Pomatiopsidae (Mollusca, Caenogastropoda) in Bahia, Brazil Pap. Avulsos Zool. (São Paulo),v.52,n.40,p.515-524,2012 http://www.producao.usp.br/handle/BDPI/38182 Downloaded from: Biblioteca Digital da Produção Intelectual - BDPI, Universidade de São Paulo Volume 52(40):515‑524, 2012 A NEW GENUS AND SPECIES OF CAVERNICOLOUS POMATIOPSIDAE (MOLLUSCA, CAENOGASTROPODA) IN BAHIA, BRAZIL 1 LUIZ RICARDO L. SIMONE ABSTRACT Spiripockia punctata is a new genus and species of Pomatiopsidae found in a cave from Serra Ramalho, SW Bahia, Brazil. The taxon is troglobiont (restricted to subterranean realm), and is characterized by the shell weakly elongated, fragile, translucent, normally sculptured by pus‑ tules with periostracum hair on tip of pustules; peristome highly expanded; umbilicus opened; radular rachidian with 6 apical and 3 pairs of lateral cusps; osphradium short, arched; gill filaments with rounded tip; prostate flattened, with vas deferens inserting subterminally; penis duct narrow and weakly sinuous; pallial oviduct simple anteriorly, possessing convoluted by‑ pass connecting base of bulged portion of transition between visceral and pallial oviducts with base of seminal receptacle; spermathecal duct complete, originated from albumen gland. The description of this endemic species may raise protective environmental actions to that cave and to the Serra Ramalho Karst area. Key-Words: Pomatiopsidae; Spiripockia punctata gen. nov. et sp. nov.; Brazil; Cave; Tro- globiont; Anatomy. INTRODUCTION An enigmatic tiny gastropod has been collected in caves from the Serra Ramalho Kars area, southwestern The family Pomatiopsidae is represented in the Bahia state, Brazil. It has a pretty, fragile, translucent Brazilian region by only two species of the genus Id‑ shell in such preliminary gross anatomy, which already iopyrgus Pilsbry, 1911 (Simone, 2006: 94). However, reveals troglobiont adaptations, i.e., depigmentation, the taxon is much richer in remaining mainland ar- lack of eyes and small size. The sample has been brought eas, with both freshwater and semi-terrestrial habits by Maria Elina Bichuette, who is specialized in subter- (Ponder & Keyzer, 1998; Kameda & Kato, 2011). ranean fauna. Complementary analysis revealed a new Common features of the pomatiopsids are small size pomatiopsid for which no known genus can be attrib- (smaller than 15 mm), elongated to short spired, and uted. Both genus and species are hereby formally in- smooth shell with paucispiral protoconch. The main troduced, including a detailed anatomical investigation. distinction from other rissooideans is the diaulic pal- The description of this new taxon is not only academi- lial oviducts of the females; i.e., the typical pallial ovi- cally urgent, but the cave is also threatened for econom- duct has two separate openings to the pallial cavity ic reasons. The description of an endemic species helps (Davis, 1967, 1979; Ponder, 1988). in the argumentation for preserving this fragile location. 1. Museu de Zoologia, Universidade de São Paulo. Caixa Postal 42.494, 04218-970, São Paulo, SP, Brasil. E-mails: [email protected]; [email protected] 516 Simone, L.R.L.: A new Pomatiopsidae from Bahia MATERIAL AND METHODS pustules containing hair-like projections of periostra- cum. Freshwater environment. All specimens were fixed in 70% Ethanol. The dissections were performed under a stereomicro- Description: Outline turbiform to slightly turriform. scope by standard techniques, with the specimens Protoconch paucispiral, of single whorl. Outer sur- immersed under fixative. Digital photos of each step face simple, except for small pustules distributed in of the dissection were obtained, as well as drawings somewhat spiral alignment, absent in some specimens aided by a camera lucida. A scanning electron mi- (surface totally smooth). Peristome highly expanded croscope (SEM) was employed to view details of the and sprayed except for implantation on columellar shell and radula in the Laboratório de Microscopia surface. Umbilicus somewhat opened. Operculum Eletrônica of Museu de Zoologia da Universidade de thin. Pair of strong ventral retractor muscles of snout. São Paulo. Salivary gland reduced. Gonoducts closed (tubular); oviduct with bypass in posterior region. Spermathecal Anatomical abbreviations in the figures: ag, albumen duct originated from albumen gland. gland; an, anus; au, auricle; bm, buccal mass; br, sub- radular membrane; ce, cerebral ganglion; cg, capsule Type species: S. punctata new species. gland; cm, columellar muscle; co, bulged region of oviduct; cv, ctenidial vein; dd, duct to digestive List of included taxa: S. punctata new species. gland; df, dorsal folds of buccal mass; dg, digestive gland; es, esophagus; fe, fecal pellets; fp, female pores; Etymology: The generic epithet is a contraction of ft, foot; gi, gill; in, intestine; ir, insertion of m4 in Latin words spiri, from spira, and pocillum a little cup. subradular cartilage; is, insertion of m5 in subradular Meaning something like a spiral small cup. This name cartilage; jw, jaws; ki, kidney; m2‑m12, odontophore is also used by my father, Egydio do Carmo de Sim- muscles; mb, mantle border; mj, jaw and peribuccal one, to designate any female pet in which he does not muscles; mo, mouth; ne, nephrostome; oc, odonto- know the name. phore cartilage; od, odontophore; of, Spermathecal oviduct; op, opercular pad; os, osphradium; ov, pal- Pronunciation: in English terms the genus must be vo- lial oviduct; oy, ovary; pa, penis aperture; pc, peri- calized as “speereepowqueeah”. cardium; pd, penis duct; pe, penis; pg, anterior fur- row of pedal glands; pl, pleural ganglion; pn, pedal glanglion; pt, prostate; ra, radula; rm, snout ventral Spiripockia puncata new species retractor muscle; rn, radular nucleus; rs, radular sac; (Figs. 1‑33) rt, rectum; sa, salivary gland aperture; sc, subradular cartilage; sd, sperm duct; sg, salivary gland; sn, snout; Types: Holotype MZSP 105000. Paratypes: MZSP st, stomach; su, subesophageal ganglion; sv, seminal 104435, 19 specimens, MNRJ 30503, 1 specimen, vesicle; sy, statocyst; te, cephalic tentacle; tg, integu- USNM 2060411, 1 specimen, all from type locality. ment; tn, tentacular nerve; ts, testis; ve, ventricle; vd, vas deferens; vo, visceral oviduct. Type locality: BRAZIL. Bahia; Serra Ramalho Karst area, Middle São Francisco River basin, Lapa dos Abbreviatons of institutions: MNRJ, Museu Na- Peixes cave, 13°49’21.78”S, 43°57’24.39”W (M.E. cional da Universidade Federal do Rio de Janeiro; Bichuette col., 29/vii/2005). MZSP, Museu de Zoologia da Universidade de São Paulo; USNM, National Museum of Natural History, Diagnosis: Shell weakly elongated; walls thin, fragile, Smithsonian Institution. translucent, unpigmented. Sculptured by pustules somewhat spirally aligned, possessing periostracum hair on tip of pustules (sometimes absent). Peristome Systematics expanded in plane ~90° in relation to last quarter whorl. Umbilicus opened. Strong pair of ventral Family Pomatiopsidae snout retractor muscles passing through nerve ring. Genus Spiripockia new genus Radular rachidian with 6 apical and 3 pairs of lateral cusps, ~10 terminal cusps in radular lateral and mar- Diagnosis: Turbiform shell with highly expand- ginal teeth. Eyes absent. Head-foot unpigmented. Os- ed peristome. Walls translucent, smooth except for phradium short, arched. Gill filaments with rounded Papéis Avulsos de Zoologia, 52(40), 2012 517 tip. Salivary glands short, small. Odontophore lacking DESCRIPTION pair of ventral tensor muscles (m11). Genital pallial gonoducts closed (tubular). Prostate flattened, with Shell (Figs. 1‑5, 8‑14): Up to 5 mm; about as wide as vas deferens inserting subterminally. Penis duct nar- long, turbiform to slightly turriform. Spire angle ~50°. row and weakly sinuous. Pallial oviduct simple ante- Color pale beige to white, translucent. Protoconch riorly; posterior region possessing convoluted bypass occupying ~20% of shell width and ~7% of length; connecting base of bulged portion of transition be- globose, smooth, transparent (Figs. 3, 5, 10, 13). tween visceral and pallial oviducts with base of semi- Transition protoconch-teleoconch weak, orthocline. nal receptacle; spermathecal duct complete, opening Teleoconch up to 4 convex whorls; suture deep, with close to anus level. Nerve ring with well delimited ~90°; whorls somewhat uniform, except for last whorl ganglia. in adult specimens, with bluntly pointed projection FIGURES 1‑11: Spiripockia punctata shell and operculum: 1) holotype, dorsal view (H 4.6 mm); 2) same, apertural-slightly anterior view; 3) same, apertural view; 4) paratype MZSP 104435 2♀ with specimens extracted, apertural view (H 3.3 mm); 5) same, apical-slightly apertural view; 6) holotype operculum, outer view (H 1.2 mm); 7) same, inner view; 8) young paratype, apertural view; 9) same, another specimen, left view; 10) paratype 6♀, apertural-slightly left view (H 3.4 mm); 11) same, anterior-slightly apertural view. 518 Simone, L.R.L.: A new Pomatiopsidae from Bahia located approximately in opposed side from aper- line (Figs. 8-9); gradually after 2-3 whorls sculpture ture (Figs. 2, 5, 11) (more visible in apical or ante- changing to adult pattern. Peristome expanding in rior views); projection absent in younger specimens plane ~90° in relation to terminal region of body (Figs. 8-9); being clearly derived from previous ap- whorl
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