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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.    Eulimacrostoma   microsculpturata    Souza &amp; 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:    Eulimacrostoma   chascanon    (Watson, 1883),  comb. nov. ,    Eulimacrostoma   fusus    (Dall, 1889),  comb. nov. ,    Eulimacrostoma   lutescens    (Simone, 2002),  comb. nov. , and    Eulimacrostoma   patula    (Dall &amp; Simpson, 1901),  comb. nov.  Newly available material of    Eulimacrostoma   patula    expands the known geographic distribution of this species in the Caribbean to the north coast of Brazil.    Eulimacrostoma   chascanon    and    Eulimacrostoma   fusus    and    Eulimacrostoma   lutescens    are known only by the type series which was re-examined. A redescription is provided for    Eulimacrostoma   chascanon    and    Eulimacrostoma   fusus   . Species within    Eulimacrostoma    differ mainly by teleoconch sculpture, the presence or absence of an umbilical fissure, and shell dimensions. Lectotypes are designated for    Eulimacrostoma   chascanon   ,    Eulimacrostoma   fusus   , and    Eulimacrostoma   patula   .

zoosystematics and evolution

Eulimacrostoma    gen. nov., a new genus of   Eulimidae   (  Gastropoda  ,   Caenogastropoda  ) with description of a new species and reevaluation of other western Atlantic species