labial nephridia
(ARTHROPODA: Insecta)
Tubules in the head of Collembola and Thysanura, whose terminal sac may play some excretory role.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • bivalve — bivalvular /buy val vyeuh leuhr/, adj. /buy valv /, n. 1. Also called lamellibranch. Zool. any mollusk, as the oyster, clam, scallop, or mussel, of the class Bivalvia, having two shells hinged together, a soft body, and lamellate gills. adj. 2.… …   Universalium

  • mollusk — molluskan, molluscan /meuh lus keuhn/, adj., n. mollusklike, adj. /mol euhsk/, n. any invertebrate of the phylum Mollusca, typically having a calcareous shell of one, two, or more pieces that wholly or partly enclose the soft, unsegmented body,… …   Universalium

  • gastropod — /gas treuh pod /, n. 1. any mollusk of the class Gastropoda, comprising the snails, whelks, slugs, etc. adj. 2. Also, gastropodous /ga strop euh deuhs/. belonging or pertaining to the gastropods. [1820 30; < NL Gast(e)ropoda a class of mollusks.… …   Universalium

  • Bivalvia — Taxobox name = Bivalvia fossil range = Cambrian Recent image width = 250px image caption = Acephala from Ernst Haeckel s Kunstformen der Natur , 1904 regnum = Animalia phylum = Mollusca classis = Bivalvia classis authority = Linnaeus, 1758… …   Wikipedia

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