RIOS & LEAL A new bathyal marginellid APEX 8(1-2) 27-30, mars 1993

Volvarina pontesi, a new bathyal marginellid (, ) from off Brazil

EhézerdeC RIOS

Museu Oceanografico E de C Rios, Fundaçâo Umversidade do Rio Grande 96200 Rio Grande, Brasil

and

José H LEAL(1)

Rosenstiel School of Marme and Atmospheric Science 4600 Rickenbacker Causeway, Miami, FL 33149-1098, USA

KEY-WORDS , South Atlantic, Bathyal, , new species

ABSTRACT Volvarina pontesi is descnbed from the bathyal zone off southeastern and southern Brazil The new taxon differs from other congenenc species by its large size and unusually elongated spire

INTRODUCTION RiOS (1985), having in mind future taxonomie An unknown marginellid was obtained at work with the present species, introduced the bathyal depths off southern Brazil during the nomen nudum Ledavolvanna on the third GEOMAR IV (Marine Geology FV) cruise cover of his 1985 book Acronyms used performed by N Oc Almirante Saldanha of throught the text are MNHN, Muséum the "Diretona de Hidrografia e Navegaçâo" National d'Histoire Naturelle, Pans, France, (DHN) of the Brazilian navy in 1972 MNRJ, Museu Nacional, Rio de Janeiro, Additional material of the same species was Brazil, MORG, Museu Oceanografico E de collected on the slope of southern and C Rios, Rio Grande, Brazil, USNM, National southeastern Brazil by the RV Atlântwo Sul of Museum of Natural History, Smithsoman "Fundaçâo Umversidade do Rio Grande" Institution, Washington, USA (FURG) m 1987, and by the RV Manon Dufresne dunng the French-Brazilian MD55 cruise realized by "Tenes Australes et Antarctiques Françaises" (TAAF) in 1987 The small number of live-collected specimens (1) Present address Division of Mollusks - hampered further anatomical studies, but shell NHB118, National Museum of Natural and radular moqjhokigy allocate the new History, Smithsonian Institution, Washington, species in the Volvarina Hinds, 1844 DC 20560, USA

27 APEX 8(1-2): 27-30, mars 1993 A new bathyal marginellid RIOS & LEAL

Family Marginellidae Fleming, 1828 Paratypes. Paratype 1, MNRJ 4850, length Genus Volvarina Hinds, 1844 13.2 mm; paratype 2, USNM 749862, length 13.3 mm; both from type locality; paratype 3, Volvarina pontesi sp.n. MORG 24983, off Torres, Rio Grande do Sul (Figures 1-8) State, RV Atlanüco Sul, 200 m depth, length 13.6 mm; paratypes 4-8, MORG 26075, off Shell (Figures 1-6) solid, cylindrical- Rio de Janeiro State, Brazil (23°42' S - 42°07' fiisiform, tapering at base, imperforate, W), Bouchet, Leal & Métivier 05/1987, RV reaching 15.1 mm length and 4.3 mm width, Marion-Dufresne MD55 cruise, station CB- smooth, glossy. Protoconch round, white, with 104, 430-450 m depth, Blake trawl, muddy 1.5 whorls, 0.9 mm diameter. Transition from bottom, lengths 13.5-14.0 mm; paratypes 9- protoconch to teleoconch inconspicuous. Spire 12, MNHN, unnumbered: paratype 9, length high, acute, apical angle about 20°. Suture 14.4 mm; paratype 10, length 13.5 mm; distinct, not canaliculated, covered by transparent enamel. Teleoconch with four or paratype 11, length 14.1 mm; paratype 12, five straight whorls. Aperture elongate length 13.5 mm; last four from off Rio de (length/width about 7), about 0.5 of shell Janeiro State, Brazil (23°47' S - 42° 10' W), length, narrower adapically. Outer lip straight Bouchet, Leal & Métivier 05/1987, RV or slightly concave. Columella with 4 small, Marion-Dufresne MD55 cruise, station CB- abapical plicae, all of same size. Anterior 105, 610 m depth, Blake trawl, muddy bottom. canal shallow, wide. Outer lip straight, smooth internally. Parietal region smooth. Etymology. Named after fisherman Periostracum absent. Leopoldino R. Pontes from Rio Grande, Brazil, who provided material to the Museu (Figures 7 & 8) rachiglossate, Oceanografico (MORG) for three decades. formula 0-R-O, with about 28 rows and 0.17- Mr. Pontes collected extensively mollusks and 0.20 mm length. Rachidian tooth multicuspid, shells aboard the fishing vessels Pescal 2, asymmetrical, with 19-23 cusps. Four to six Mestre Gerônimo and Akaroa. large cusps unevenly distributed among small cusps. Remarks. General shell morphology and radula allocate the new species in the genus Holotype. MORG 17889, 15.1 mm length, Volvarina (COAN, 1965; COAN & ROTH, 4.3 mm width, N.Oc. Almirante Saldanha 1976; ROTH, 1978). The comb-like radular GEOMAR IV cruise, station 2820, Van Veen grab. tooth is somewhat similar to those in Volvarina bilineata (Krauss, 1848) Type Locality. Off Itajai, Santa Catarina (Coo VERT & Coo VERT, 1987) and State, Brazil (27°00' S - 46°10' W), 1140 m Volvarina philippinarum (Redfield, 1848) depth, sandy mud bottom.

Figures 1-8 (opposite). Volvarina pontesi sp.n.; 1-3. Holotype, MORG 17889, 13.8 mm length, 4.3 mm width; 4-6. Paratype 9, MNHN, 14.4 mm length, 4.0 mm width; 7-8. Radula. Scale bars: Figures 1-6 = 5 mm; Figure 7-8 = 0.05 mm.

28 RIOS & LEAL A new bathyal marginellid APEX 8(1-2) 27-30, mars 1993

29 APEX 8(1-2) 27-30, mars 1993 A new bathyal marginellid RIOS & LEAL

(COAN, 1965) Future studies in LITERATURE CITED comparative anatomy may, however, indicate that V pontesi belongs m a separate genus CARCELLES, AR, 1946 Notas sobre dos Volvarma pontesi is promptly distinguish­ especies Argentinas de Marginellidae Notas able from most Volvarma by its large size, delMuseo de La Plata 9, Zoologia 92 51-57 slender shape and rather high spire The new COAN, E V , 1965 A proposed reclassifica­ species is somewhat similar in shell morphol­ tion of the Family Marginellidae Veliger 7(3) ogy to the Patagonian-Magellanic Volvarma 184-194 warrenii (Marrat, 1876) [= V patagomca CoAN, EV & B ROTH, 1976 Status of (Martens, 1881] and V dozei (Rochebrune & the genus Hyalma Schumacher, 1817 MabiUe, 1889), from which it differs by a (Mollusca Gastropoda) Journal of Mollus- more elongate shell with relatively longer can Research 42 217-222 spire, white protoconch and early teleoconch CLENCH, W J & R D TURNER, 1950 The whorls, which are dark in V warrenii and V western Atlantic manne mollusks descnbed by dozei, and the absence of a well-delineated, C B Adams Occasional Papers on Mollusks white band in the middle of the body 1 (15) 233-403 whorl,present in the other two species COOVERT, GA «feHK COOVERT, 1987. (CARCELLES, 1946, POWELL, 1951) It Preparation of marginellid radulae somewhat resembles V gracilis C B Adams, Marginalia 2 {A) 20-26 1851 (see illustration in CLENCH & TURNER, POWELL, AWB, 1951 Antarctic and 1950) However, V gracilis is a much smaller subantarctic Mollusca Pelecypoda and Gas­ species, reaching around 7 mm m length, tropoda Discovery Reports 26 47-196 whereas adult V pontesi measures about 13 RJOS, EC, 1985 Seashells of Brazil 328 mm The relationship length of aperture/total pp Museu Oceanografico, Fundaçâo Univer- length in the new species is about 0 5, the sidade do Rio Grande same ratio is about 0 7 m F gracilis ROTH, B , 1978 New species and records of tropical west Amencan Marginellidae Acknowledgments (Mollusca ) Contributions in We are indebted to Philippe BOUCHET of Science of the Natural History Museum of the Muséum National d'Histoire Naturelle, Los Angeles County 292 1-18 Pans, who provided matenal collected dunng the French-Brazilian MD55 cruise of the Marion-Dufresne

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