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Neogene of Tropical America Cainozoic Research, 6(1-2), pp. 61-70, March 2009 The Gastropod Genus Nerita in the Neogene of Tropical America ³ Geerat+J. Melissa+A. ² & Bernard+M. Landau Vermeij ¹, Frey 'Department of Geology, University ofCalifornia at Davis, One Shields Avenue, Davis, CA 95616, United States; e-mail: [email protected] 2 Center for PopulationBiology, University of California at Davis, One Shields Avenue. Davis, CA 95616, United States; e-mail: [email protected] 3 InternationalHealth Centers, Av. Infante D. Henrique, Areias Sdo Jodo, 8200 Albufuera, Portugal; e-mail: [email protected] Received 8 November2007; revised version accepted 14 January 2008. The Nerita is in the Cantaure neritid neritaemorph gastropod genus Linnaeus, 1758, representedby two new species Formation (Early Nerita the known member Nerita clade Miocene: Burdigalian)of Venezuela. (Nerita) rugulosa n. sp. is earliest of s.s., a of tropical American species that also includes the Recent West Indian N. peloronta Linnaeus, 1758,and N. versicolor Gmelin, 1791, and the east- differs from ern Pacific N. scabricosta Lamarck, 1822. Nerita rugulosa these species by having fewer, more prominent spiral ribs and a is related Atlantic conspicuously ridged, pustulose septum. Nerita (Theliostyla)paucigranosa n. sp. to the Recent western N. fulgurans Gmelin, 1791, and the eastern Pacific N. funiculata Menke, 1850, but differs from these species by its larger size and by having fewer, moreprominent septal pustules. We report N. (T.) exuvioides Trechmann, 1935, previously known from the Point Hilaire beds of Carri- acou and the Gatun Formation of Panama,from the Baitoa Formation (early Middle Miocene) ofthe Dominican Republic. Nerita oli- gopleuraDali & Ochsner, 1928, from the Pliocene ofthe GalapagosIslands, is here tentatively assigned to the subgenusIlynerita von Martens, 1887. Members of the Nerita ascensionis Gmelin, 1791,complex in the southwest Atlantic are removed from Theliostyla Mörch, 1852, and recognized as related to N. magdalenaeGmelin, 1791.from the southwestern Indian Ocean. Nerita magdalenaeCol- lignon & Cottreau, 1927,from the Miocene ofMadagascar, is renamed N. valdespinosa. We assign Nerita chilensis Philippi, 1887, from the Navidad Formation of Chile,to the subgenusLisanerita Krijnen, 2002; and we more tentatively assign Nerita joaquinensisAddicott, of California 1970,from the Round Mountain Silt (Middle Miocene) to the same subgenus. KEY WORDS:: Nerita, systematics, new species. informative Introduction n. sp., a phylogenetically taxon in Nerita S.S., an exclusively tropical American clade. To place these taxa Gastropods characteristic of the rocky intertidal zone are in a broader context, we review other known Recent and infrequently encountered in the fossil record, but the ex- Neogene fossil species ofNerita in tropical America and tremely rich faunaofthe Cantaure Formation (Early Mio- comment on the taxonomic assignments and nomenclature cene: Burdigalian) ofVenezuela contains a diverse assem- of several other species. blage ofwell preserved, hard-bottom, intertidalto shallow- subtidal species of notably modern aspect. These include species of Thais, Acanthais (as Stramonita in Vermeij, Materials and Methods 2001), Stramonita, Plicopurpura, Neorapana, Microrhytis, various of the fossil examined is in Ocinebrina, Macron, Hesperisternia, and limpets, Most material we the Landau among others (Jung, 1965; Gibson-Smith et al., 1997; collection, but we have also examined specimens at CAS Vermeij & Yokes, 1997; Vermeij, 2001, 2006). An addi- (California Academy of Sciences, San Francisco) and tional rocky-shore genus in the faunais Nerita. Jung (1965) UCMP (MuseumofPaleontology, University ofCalifornia, identifiedthe single species he encounteredin the Cantaure Berkeley). All Recent material discussed is in the Vermeij Formation as N.fulgurans Gmelin, 1791, a Recent West collection. this form Indianspecies. Here we describe as the new spe- cies Nerita (Theliostyla) paucigranosa n. sp., and name a Shell dimensions measured are as follows: major diameter second, hitherto unknown form as N. (Nerita) rugulosa D, more or less perpendicular to the shell’s axis ofcoiling; -62- minordiameterD more or less to the axis of coil- s.s. to be The 2 parallel monotypic (Vermeij, 1984; Krijnen, 2002). ing; and height H, distance from dorsal surface to base. West Indian N. versicolor Gmelin, 1791, has generally 12 Relative was calculated as R = x D been the taxon height H(D| 2) . assigned to subgenus Ritena Gray, 1858, a based on the Recent Indo-WestPacificN. plicata Linnaeus, 1758 (see Krijnen, 2002); whereas the eastern Pacific N. Shell Morphology scabricosta Lamarck, 1822, has been placed in either Ritena (Keen, 1971) or Cymostyla von Martens, 1887, In describing shells of the genus Nerita, we employ a whose Indo-West Pacific type species (Nerita undata Lin- different from that slightly terminology used by previous naeus, 1758) has recently been clarified (Krijnen, 2002; authors. In the is in the form of loose nerites, outer lip a Krijnen et al., 2006). spiral, whose growing end is atthe adapical end ofthe shell ventral to the apex. In the abapical direction, the spiral ex- Molecularphylogenetic analyses now show, however, that tends around to the abapical end of the aperture and then Recent high-spired forms of Nerita in tropical America continues less distinct This which form clade as a more or ridge. ridge, a strongly supported monophyletic comprising we call the abapertural ridge, marks the abapertural limitof N. peloronta, N. versicolor, and N. scabricosta. Within this the septum and peters out on the adapical side of the sep- clade, the West IndianN. peloronta appears as a sister spe- tum. We use the term septum for the convex, flat, or con- cies to the West Indian N. versicolor, together, these spe- surface the the ventral surface cies sister the Pacific scabricosta cave adjacent to aperture on are to eastern N. (M. of the shell. Other authors have referred the in All members ofthe clade inhabitthe to septum as Frey, preparation). the parietal shield or columellararea. The abapertural ridge upperrocky shore. They have two medianteeth as well as a is indistinct of absent or extremely in species the subgenera square adapical toothon the septal edge. The septal surface and Amphinerita von Martens, 1887, Linnerita Vermeij, is typically sculptured with irregular ridges, although in N. 1984. In fact, in Nerita umlaasiana Krauss, 1848 (type peloronta it is more or less smooth. The denticlesinside the species ofAmphinerita) and related Recent Indo-West Pa- outer lip are always present in adults. In N. versicolor and cific species, the septum is covered with an extensive, N. rugulosa n. sp. (see below), the adapical-most tooth on glossy-smooth callus that extends onto the dorsal side of the outer lip is enlarged and ventrally protruding; in the the last whorl the This of other the tooth is opposite aperture. case partial species, enlarged protruding abapical to a shell envelopment was overlooked by Vermeij (2005) in small tooth. his of survey enveloped molluscs. Morphologically, shells ofNerita s.s. veryclosely resemble In adults of many species ofNerita s.l., the septal surface is those of Cymostyla. The only consistent differencebetween sculptured with ridges thatrun from the septal edge ofthe these two groups is that the abapical-most outer-lip toothin aperture to the abapertural ridge. These are here called sep- Nerita s.s. is somewhat enlarged (though not as much as the tal ridges. In most cases, these ridges are expressed only on adapical-most tooth), whereas in species of Cymostyla the the abapical half to two-thirds of the septal surface. In abapical-most tooth is not enlarged. Nerita s.s. resembles many groups, the ridges bear granules or pustules. The ap- Ritena in many characters as well, including the heavily ertural edge of the septum often bears denticles, but these ridged septum, numberand prominence ofteeth on the sep- do not bear a relationship to the septal ridges. In juvenile tal margin, and enlargement of the abapical and adapical and denticles specimens, septal ridges, septal denticles, on teeth. Nerita s.s., however, has more numerous outer-lip the inner thickened of the outer often absent. teeth and ribs. edge lip are spiral Nerita versicolor converges in aper- tural characteristics on N. (R.) plicata, but its apertural teeth are more numerous and smaller, and the teeth on the Systematic Paleontology abapical and adapical end of the outer lip protrude much less than in N. (R.) plicata. The new species N. rugulosa Genus Nerita Linnaeus, 1758 describedbelow has the high spire, septal ridges, andaper- turalteeth ofRecent members ofNerita s.s., and therefore — Nerita fall within the clade defined Type species peloronta Linnaeus, 1758, Recent, appears to Nerita s.s. as by West Indies (see Abbott, 1958). molecularcriteria. It represents either a direct ancestor or a sister species to the Recent members ofNerita s.s. Subgenus Nerita Linnaeus, 1758 of the ofN. the Regardless exact placement rugulosa n. sp., Remarks — The taxon Nerita is based onthe Recent West new fossil species yields additional insights into the bio- Indian “bleeding tooth”. Nerita peloronta, a species living geographic history of high-spired Nerita in tropical Amer- high in the intertidal zone on rocky shores in the West In- ica. Contemporary geographic ranges ofN. peloronta and is characterized dies. This species uniquely by two strong, N. versicolor extend across the tropical western
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