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Vexillum</I> of the Subgenus <I>Pusia</I

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Vexillum</I> of the Subgenus <I>Pusia</I BULLETIN OF MARINE SCIENCE, 28(3): 543-549, 1978 CORAL REEF PAPER A NEW VEXILLUM OF THE SUBGENUS PUSIA (GASTROPODA: VEXILLIDAE) FROM THE BAHAMAS William G. Lyons and Sally D. Katcher ABSTRACT Vexilllllll (PlIsia) chickcharneorum, new species, is described from three Bahamian Islands, and is compared with other similar Caribbean PlIsia. A summary of proposed names for Caribbean Pusia is presented, with additional comments on several species. Western Atlantic species of the genus slilcata GmcIin, 1791 (p. 3455) (Cerno- Vexillum Roding, 1798, are divided among horsky, personal communication), and in any the subgenera Costellaria Swainson, 1840 event was erected for the similar Indo-Pacific and Plisia Swainson, 1840, all species of species properly known as VexilLum (Pusia) Vex ilium s.s. being confined to the Indo- microzonias (Lamarck, 1811), the type spe- Pacific region. Costellaria species bury in cies of Pusia (Cernohorsky, 1970). March mud and sand, whereas Pusia species inhabit (1852) improperly listed microzonias and rubble, coral reefs, and the undersides of V. (P.) cavea (Reeve, 1844) among Antillean stones (Cernohorsky, 1970). Specimens of species, followed soon thereafter by Krebs an apparently unnamed species of Pusia (1864), who included V. (P.) semicostatum were collected by one of us (WGL) at Great (Anton, 1839) in his list of West Indian Exuma and Cat Island, Bahamas, during species; the last two are also properly Indo- 1974 and 1976, and additional material from Pacific species. Dall (1889) tentatively listed Great Abaco was provided by Mr. Colin semicostatum and also included cavea, V. Redfern. We were initially reluctant to be- (P.) ebenus (Lamarck, 1811) and V. (P.) lieve that a locally common and distinctive speciosa (Reeve, 1844) from the western species from shallow Bahamian reefs might Atlantic, but ebenus is an eastern Atlantic be undescribed, but the following review species and speciosa belongs to the Indo- revealed no suitable previous names. Pacific fauna. VexilLlIm (Pusia) dermestinum (Lamarck, Cernohorsky (1970) combined 18 primary 181\) was the only Plisia known from the names and supposed synonyms into six "bio- tropical western Atlantic until five additional species" (pp. 3, 5) of western Atlantic Pusia species were described by Reeve (1844-45). (Table 1), based upon comparable variation In the period since Reeve's monograph, at he had noted in Indo-Pacific material; he did least 18 more names have been proposed not include V. (P.) cllbanum Aguayo and for western Atlantic Plisia by C. B. Adams Rehder, 1936, and V. (P.) arestum Rehder, (1845; 1850), March (1852), Dohrn (1862), 1943. In addition, he designated V. (P.) Sowerby (1874), Melvill (1925), Aguayo and variatum (Reeve, 1845) a synonym of the Rehder (1936), Rehder (1943), McGinty Indo-Pacific V. (P.) unifascialis (Lamarck, (1955), Nowell-Usticke (1959; 1968), and 1811), but varia tum properly belongs to the Sarasua (1975). Caribbean fauna (Abbott, 1974; Cern 0- Additionally, several erroneous names horsky, personal communication). Although have been used for western Atlantic Plisia. Abbott recognized Cernohorsky's revision, Voluta [= Vexillwn (PlIsia)] suLcata Gmelin, he listed nine western Atlantic species within 179 I (p. 3465) was long applied to the the subgenus Pusia, excluding V. (P.) epi- Caribbean species now known as Vexil/um phaneum which he included in CostelLaria. (Pusia) aLbocinctum (C. B. Adams, 1845), Nowell-Usticke (1968) named Mitra mi- but the former name is a homonym of V oluta nutus and M. hanleyi form antiguensis from 543 544 BULLETIN OF MARINE SCIENCE, VOL. 28, NO.3. 1978 Table 1. Primary "biospecies" and supposed synonyms of western Atlantic Vexi/lum, subgenus Pusia, as combined by Cernohorsky (1970) 1. dermestinum (Lamarck, 1811) 3. epiphaneum (Rehder, 1943) a/bicostatum (C. B. Adams, 1850) 4. histrio (Reeve, 1844) 2. exiguum (C. B. Adams, 1845) al'ticulatum (Reeve, 1845) han/eyi (Dohrn, 1862) a/boeinc/um (C. B. Adams, 1845) gemmatum (Sowerby. 1874) bifaseiatul11 (Morch, 1852) roseocaudatum (Sowerby, 1874) cruzanum (Nowell-Usticke, 1959) sykesi (Melvill, 1925) 5. puel/a (Reeve, 1845) moise; (McGinty, 1955) a/bol11acu/atum (Sowerby, 1874) hayesae (Nowell-Usticke, 1959) 6. pu/cheJlum (Reeve, 1844) the West Indies; the first is a homonym of other species described from unknown lo- Mitra minuta Roding, 1798, and the second, calities, but found none referable to the described as a form, is not available accord- species at hand. We conclude, therefore, that ing to Article 15 of the International Code the species has not been previously named. of Zoological Nomenclature. Both, however, Specimens of the new species are deposited appear to be Pusia, and should be added to in the molluscan collections of the British the list of names proposed for Caribbean Museum (Natural History) [BM(NH)], Lon- Pusia, as should Pusia splendidula Sarasua, don; the Academy of Natural Sciences of 1975, an apparent synonym of V. (P.) vari- Philadelphia (ANSP), Pennsylvania; the atum, described from Cuba. American Museum of Natural History Photographic illustrations of type speci- (AMNH), New York, New York; the Na- mens of all but two of the previously men- tional Museum of Natural History, Smith- tioned species were examined for this study. sonian Institution (USNM), Washington, Of the remaining two species, Vexillum D.C.; the Florida Department of Natural (Pusia) articulatum (Reeve, 1845), described Resources Marine Research Laboratory from an unknown locality, mayor may not (FSBC I), St. Petersburg, Florida, and the be a synonym of V. (P.) albocinctum (c. B. Redfern collection. Adams) as proposed by Cernohorsky (1970). The type could not be located in the British Vexillum (Pusia) chickcharneorum Museum (Natural History). Reeve (1845) new species described the species from a specimen in the Norris collection; according to Dance (1966), Figures 1-4 some types from that collection went to the Holotype.-Length 10.5 mm; north side of British Museum, but the remainder of the Stocking Is., Gt. Exuma, Bahamas; 23-25 collection went to Tomlin, whose collection June 1974; USNM 758543. is now in the National Museum of Wales at Cardiff. Reeve's type may yet reside among Paratypes.-1 paratype, 8.1 mm; north side this latter material. In any event, Reeve's Stocking Is.; 23-25 June 1974; ANSP illustration of articulatum (pI. 36, fig. 302) 345016.-2 paratypes, 7.3, 9.1 mm; same does not resemble our specimens. Pusia data; AMNH 183747.-2 paratypes, 8.4,9.0 bifasciata March, 1852 was not traced, but mm; same data; BM(NH) 1977165.-25 that name is a nomen nudum and a secondary paratypes, to 9.9 mm; same data; FSBC I homonym of Mitra [= Vexillum] bifasciata 17864.-1 paratype, 5.5 mm; northeast side Swainson, 1821, so it is not available. Cat Is., Bahamas; 12 July 1976; USNM We also searched the major treatments of 758544.-2 paratypes, 6.8, 11.2 mm; same Reeve (1844-45) and Sowerby (1874) for data; FSBC I 17866. LYONS AND KAICHER: NEW SPECIES OF VEXlLLUM 545 Figures 1-7. Caribbean Vexilllllll (PlIsia): 1, VexillulII cllickcllameortlm n. sp., juvenile paratype, 5.5 mOl, Cat Is., USNM 758544 (X 10); 2, subadult paratype, 8.1 mOl, Stocking Is., ANSP 345016 (X 5); 3, adultparatype, 11.2 mOl, Cat Is., FSBC I 17866 (X 5); 4, adult holotype, 10.5 mOl, Stocking Is., USNM 758543 (X 5); 5, immature V. ?chickchameo/'lllll, 7.9 mOl, Andros, FSBC I 17863 (X 5); 6, V. ulhocillctum (C. B. Adams), holotype, 15.0 mOl, Jamaica, MCZ 177080 (X 5) [after Clench and Turner, 1950]; 7, V. cuballwn Aguayo and Rehder, holotype, 12.0 mm, Cuba, USNM 420978 (X 5). Other materiat.-l, 5.0 mm; east end Stock- Description.-Shell small, to about 11.2 mm ing Is.; 22 June 1974; FSBC I 17865.-1, total length; mature specimens ovate in out- 9.0 mm; Thurstone Bay, northeast of Trea- line. Protoconch of two smooth, glassy, sure Cay, Gt. Abaco; 16 November 1974; brown whorls. As many as six postembry- Redfern collection.-4, 7.9-9.0 mm; Powell onic whorls, each with nearly straight axial Cay and High Cay, Gt. Abaco; Redfern col- ribs crossed by 4-9 very faint spiral striae; lection. ribs numbering 13-14, 16-18, 18-20, 18- 546 BULLETIN OF MARINE SCIENCE, VOL. 28, NO.3. 1978 20, and 16-19 on first through fifth whorls; length from about 7.0-9.0 mm, are quite one shell with complete sixth whorl bearing globose (Fig. 2), and are apparently sub- 16 ribs. Aperture narrow, with thickened adults. Only three specimens are sufficiently callus posteriorly and four, occasionally five, large (9.9-11.2 mm) to demonstrate the more columellar plicae decreasing in strength ante- elongate adult form. The most recently dead riorly; a deep excavation between callus and adult shell (Fig. 3) is heavily eroded on the plicae. Base and anterior dorsal surface of spire by encrusting coralline algae, and a body whorl ornamented with four or five second specimen is badly abraded from surf nodulose spiral cords of varying strength, rolling. The third shell, although drilled followed anteriorly on base by about four both dorsally and laterally by a muricid, best oblique cords originating at columellar plicae. demonstrates the characters of the species Outer lip curved throughout, with small cren- and is selected as holotype (Fig. 4). ulations indicating terminations of nodulose We examined one immature specimen cords on anterior half. Living or freshly which we doubtfully assign to chickcharne- dead shells black, with very broad, well de- orum. The shell (length 7.9 mm; Fig. 5) has fined, white bands occupying most of each 514 whorls, with 12, 15, 16, 16, and 13 ribs whorl of spire, nearly all of posterior half of on the first five, respectively. Rib counts are body whorl; black color fading to rich chest- fewer on every whorl, but rib shape, and nut brown on older shells.
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