Abstract
A new genus and a new species of Eulimidae are described based on the shell morphology and on the host-parasite relationship of the type species. Eulimacrostomamicrosculpturata Souza & Pimenta gen. nov. and sp. nov. parasitizes a starfish of the genus Luidia and has an elongated, conical, straight, or slightly curved shell, a protoconch with a brownish spiral band and convex whorls, a peculiar large and broad aperture with a strongly protruding outer lip, and microsculpture of axial lines on the teleoconch. Four other species are included in the genus, all from the western Atlantic: Eulimacrostomachascanon (Watson, 1883), comb. nov., Eulimacrostomafusus (Dall, 1889), comb. nov., Eulimacrostomalutescens (Simone, 2002), comb. nov., and Eulimacrostomapatula (Dall & Simpson, 1901), comb. nov. Newly available material of Eulimacrostomapatula expands the known geographic distribution of this species in the Caribbean to the north coast of Brazil. Eulimacrostomachascanon and Eulimacrostomafusus and Eulimacrostomalutescens are known only by the type series which was re-examined. A redescription is provided for Eulimacrostomachascanon and Eulimacrostomafusus. Species within Eulimacrostoma differ mainly by teleoconch sculpture, the presence or absence of an umbilical fissure, and shell dimensions. Lectotypes are designated for Eulimacrostomachascanon, Eulimacrostomafusus, and Eulimacrostomapatula.
Highlights
Eulimidae Philippi, 1853 is a diverse group of marine gastropods comprising more than 1,000 valid species and more than 90 valid genera (MolluscaBase 2018)
The availability of a single specimen hampered the description of the taxa, but recently we identified shells of the same species from nearby localities in malacological collections, which enabled the present description
In addition to the type series of Eu. lutescens, we find two other shells collected from the type locality
Summary
Eulimidae Philippi, 1853 is a diverse group of marine gastropods comprising more than 1,000 valid species and more than 90 valid genera (MolluscaBase 2018). Warén (1983) suggested that all species in a given genus parasitize a single class of Echinodermata, with the exception of Vitreolina Monterosato, 1884, which is known to exploit ophiuroids and echinoids. Copyright Leonardo Santos de Souza, Alexandre Dias Pimenta. One eulimid attached to the starfish Luidia ludwigi scotti Bell, 1917 (Luidiidae), collected in the upper bathyal zone off Florida, USA, was studied by the authors and did not correspond to any other species and genus known to parasitize asteroids or other echinoderms. The availability of a single specimen hampered the description of the taxa, but recently we identified shells of the same species from nearby localities in malacological collections, which enabled the present description
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