Genostoma kozloffi sp. nov. and G. inopinatum sp. nov. (Turbellaria: Neorhabdocoela: Genostomatidae) from leptostracan crustaceans of the genus Nebalia
Hyra, G.S. (1993). Genostoma kozloffi sp. nov. and G. inopinatum sp. nov. (Turbellaria: Neorhabdocoela: Genostomatidae) from leptostracan crustaceans of the genus Nebalia. Cah. Biol. Mar. 34(1): 111-126
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723; e-ISSN 2262-3094
Two new species of the turbellarian genus Genostoma, living under the carapace of leptostracan crustaceans of the genus Nebalia, are described. Genostoma kozloffi is a symbiont of N. pugettensis in the San Juan Archipelago of Washington State; G. inopinatum is associated with N. bipes at Roscoff on the Atlantic coast of France. The two species differ from one another, and also from G. tergestinum and G. marsiliense, both found on N. bipes at Mediterranean localities, in the shape of the body, relative pharynx size, and the structure of the reproductive system. The arrangement of the reproductive organs and sperm morphology in species of Genostoma suggest that Doerler (1900) and von Graff (1903) were correct in placing the genus in the order Rhabdocoela (now usually Neorhabdocoela), rather than in the Alloecoela (now Prolecithophora) as proposed by Reisinger (1924). Reisinger's synomizing of Genostoma with Calandruccio's (1897) genus Hypotrichina is rejected, because these symbionts of Nebalia are decidedly different from the type species of Hypotrichina, which is a free-living member of the Otoplanidae (Prolecithophora).
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