Eulima ephamilla Watson 1883

• Main Authors: Souza, Leonardo Santos De, Pimenta, Alexandre Dias, Barros, José Carlos Nascimento De
• Format: Text
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Littorinimorpha; Eulimidae; Eulima; Eulima ephamilla; Gardner; Coates; Barros; Aldrich; Northeast Atlantic
• Online Access: https://dx.doi.org/10.5281/zenodo.4557496; https://zenodo.org/record/4557496

Eulima ephamilla Watson, 1883 (Figure 5 A–E) Eulima ephamilla Watson, 1883: 116–117. Watson (1886: plate 35, figure 6a–c). Eulima (“ Liostraca ”) stenostoma auct. non Jeffreys, 1858: Dall (1889a: 126). Eulima ( Leiostraca ) rectiuscula Dall, 1890: 160 (in part). Melanella ephamilla (Watson, 1883): Lange-de-Morretes (1949: 82); Rios (1994: 103, plate 34, figure 426 [reproduced from original illustration]); Rios (2009: 191, figure 468 [reproduced from original illustration]). Balcis ephamilla (Watson, 1883): Rios (1975: 61, plate 16, figure 239 [reproduced from original illustration]); Rios (1985: 54, plate 20, figure 242 [reproduced from original illustration]). Type material. Lectotype (herein designated): NHMUK 1887.2.9.1589 (Figure 5A, B). Paralectotypes (herein designated): NMW 1955.158.11088 [2 dd] (Figure 5C), from type locality. Holotype of Eulima rectiuscula Dall, 1890: USNM 87343 (Figure 5D, E), USFC stn. 2668 (30°58′30″N 79°38′30″W, 538 m), coll. 05/v/1886. Type locality. Brazil: off Pernambuco, Challenger stn. 122. Material examined. Type material. Measurements. Lectotype NHMUK 1887.2.9.1589, ~10 whorls (protoconch broken), SL= 8.5 mm; BWL= 3.4 mm; AL= 2.1 mm; SW= 1.8 mm; AW= 1.2 mm. Paralectotype NMW 1955.158.11088, ~10 whorls (protoconch broken), SL= 6.3 mm; BWL= 2.7 mm; AL= 1.6 mm; SW= 1.4 mm; AW= 0.9 mm. Paralectotype NMW 1955.158.11088, ~10 whorls (apex and aperture broken), SL= 8.0; BWL= 3.3 mm; AL= 1.6 mm; SW= 1.7 mm; AW= 0.9 mm. Holotype of Eulima rectiuscula , USNM 87343, ~8 whorls (apex broken), SL= 9.6; BWL= 4.0 mm; AL= 2.4 mm; SW= 2.0 mm; AW= 1.3 mm. Remarks. The shell numbered NHMUK 1887.2.9.1589 (Figure 5A, B) is the figured specimen by Watson (1886: plate 35, figure 6a–c) and is here designated as the lectotype. There are two other shells from the type locality stored in the NMW (NMW 1955.158.11088), which are here considered as paralectotypes. Watson (1883: 116) cited that “the specimen is dead and discoloured”, which could indicate that he referred to a single shell. However, Watson (1883) did not designate holotypes in his descriptions, and as other shells from the same locality were found, we prefer to consider that all were originally syntypes. See discussion for the status of types in the NMW. Watson’s (1883) description is appropriate to the lectotype and there is no need for a redescription. We only add that there is no presence of an umbilical fissure as stated by him in describing a “very minute furrow” behind the inner lip. Eulima ephamilla presents the general shape typical of Eulima sensu stricto, with an elongated, conical shell of slowly increasing diameter, flat whorls, narrow and elongated aperture as the type species of the genus, E. glabra (da Costa, 1778) (Warén 1989). MolluscaBase Eds. (2020a) cited Eulima rectiuscula Dall, 1890, from Georgia, USA, as a junior synonym of E. ephamilla without discussion. The holotype of E. rectiuscula (Figure 5D, E), collected from the USFC stn. 2668 ( vide original label), also has a broken protoconch, but the general outline and dimensions are indistinguishable from the holotype of E. ephamilla . When Dall (1890) described E. rectiuscula , he also referred to samples of this species from the Caloosahatchee, a Plio-Pleistocene formation in Florida (Allmon et al. 1996). These fossil specimens were later recognized as a distinct species described by Gardner & Aldrich (1919: 39, plate 2, figure 5), currently known as Eulima dalli . In addition to the differences pointed by Gardner & Aldrich (1919), we add that the outer lip of E. ephamilla is more retracted at the proximal area than that of E. dalli . Thus, we consider E. rectiuscula as a junior synonym of E. ephamilla and that E. dalli is a valid species known only from the Miocene and Pliocene (Olsson & Harbison 1953). Eulima ephamilla is known only from two localities distant from each other by more than 6,000 km. The general shape of Eulima ephamilla resembles E. incolor Bouchet & Warén, 1986 (Figure 5F, G), from deep waters off Spain, and E. psila Watson, 1883 (Figure 6 A–M), from the western Atlantic. However, E. ephamilla can be distinguished from E. incolor by the relatively bigger shell (holotype of E. ephamilla , 10 whorls, SL= 8.5 mm vs. holotype MNHN-IM-2000-5660 of E. incolor , 11 whorls, SL= 6.6 mm) and by the more elongated shape of the aperture. The aperture of both species is oblong but the ratio AW/AL in E. ephamilla and E. incolor is very different (0.69 and 0.48, respectively). Eulima ephamilla differs from E. psila by the outline of the outer lip, which protrudes in the former (Figure 5B, E) and is straight in the later (Figure 6I). Geographical distribution. USA: Florida (Dall 1890); Brazil: Pernambuco (Watson 1883). Bathymetric distribution. From 538 m to 640 m (Watson 1883; Dall 1890). : Published as part of Souza, Leonardo Santos De, Pimenta, Alexandre Dias & Barros, José Carlos Nascimento De, 2021, Revision of the deep-sea Eulimidae (Gastropoda, Caenogastropoda) from off Northeast Brazil, pp. 451-504 in Zootaxa 4927 (4) on pages 460-462, DOI: 10.11646/zootaxa.4927.4.1, http://zenodo.org/record/4542923 : {"references": ["Watson, R. B. (1883) Mollusca of H. M. S. \" Challenger \" Expedition. Part XVII. Zoological Journal of the Linnean Society, 17 (99), 112 - 130. https: // doi. org / 10.1111 / j. 1096 - 3642.1883. tb 02043. x", "Watson, R. B. (1886) Report on the Scaphopoda and Gasteropoda collected by H. M. S. Challenger during the years 1873 - 1876. Report on the Scientific Results of the Voyage of H. M. S. Challenger, Zoology, 15 (2), 1 - 680 + 692 - 756, 50 pls.", "Jeffreys, J. G. (1858) XIV-Gleanings in British Conchology. Annals and Magazine of Natural History, 2, 117 - 133. https: // doi. org / 10.1080 / 00222935808696993", "Dall, W. H. (1889 a) A preliminary catalogue of the shell-bearing marine mollusks and brachiopods of the southeastern coast of the United States, with illustrations of many of the species. Bulletin of the United States National Museum, 37, 1 - 221, pls. 1 - 74.", "Dall, W. H. (1890) Contributions to the Tertiary fauna of Florida, with special reference to the Miocene silex-beds of Tampa and the Pliocene beds of the Caloosahatchie River. Part I. Pulmonate, opisthobranchiate and orthodont gastropods. Transactions of the Wagner Free Institute of Science of Philadelphia, 3, 1 - 200, pls. 1 - 12.", "Lange-de-Morretes, F. (1949) Ensaio de catalogo dos moluscos do Brasil. Arquivos do Museu Paraense, 7, 1 - 216.", "Rios, E. C. (1994) Seashells of Brazil. 2 nd Edition. Editora da Fundac \" o Universidade do Rio Grande, Rio Grande, 368 pp., 113 pls.", "Rios, E. C. (2009) Compendium of Brazilian seashells. Evangraf, Rio Grande, viii + 668 pp.", "Rios, E. C. (1975) Brazilian marine mollusks iconography. Museu Oceanografico do Rio Grande, Rio Grande, 331 pp., 91 pls.", "Rios, E. C. (1985) Seashells of Brazil. Editora da Fundac \" o Universidade do Rio Grande, Rio Grande, 328 pp., 102 pls.", "Da Costa, E. M. (1778) Historia Naturalis Testaceorum Britanniae or The British Conchology. Printed for the author, London, 254 pp.", "Waren, A. (1989) Designation of neotypes of ' Melanella alba (da Costa, 1778) ' and ' Eulima glabra (da Costa, 1778) ' (Proso- branchia). Journal of Conchology, 33, 219 - 224.", "Bouchet, P. & Waren, A. (1986) Revision of the northeast Atlantic bathyal and abyssal Aclididae, Eulimidae, Epitoniidae (Mollusca, Gastropoda). Bollettino Malacologico, Supplemento 2, 299 - 576. https: // doi. org / 10.5962 / bhl. title. 140762", "Allmon, W. D., Rosenberg, G., Portell, R. W. & Schindler, K. (1996) Diversity of Pliocene-Recent mollusks in the Western Atlantic: Extinction, Origination, and Environmental change. In: Jackson, J. B., Budd, A. F. & Coates, A. G. (Eds.), Evolution and Environment in Tropical America. The University of Chicago Press, Chicago, pp. 271 - 302.", "Gardner, J. A. & Aldrich, T. H. (1919) Mollusca from the Upper Miocene of South Carolina with descriptions of new species. Proceedings of the Academy of Natural Sciences of Philadelphia, 71, 17 - 53, pls. 1 - 4.", "Olsson, A. A. & Harbison, A. (1953) Pliocene Mollusca of southern Florida with special reference to those from North Saint Petersburg. Academy of the Natural Sciences of Philadelphia, Monograph, 8, 1 - 361."]}