orificial wall

1. In Gymnolaemata, an exterior zooidal wall that bears or defines the orifice through which the lophophore passes.
2. In Stenolaemata, an orifice through which the tentacles protrude.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • basal zooidal wall — (BRYOZOA) In Stenolaemata and Gymnolaemata, the interior or exterior zooidal supporting wall, normally parallel to the orificial wall …   Dictionary of invertebrate zoology

  • orifice — n. [L. os, mouth; facere, to make] 1. An opening into a cavity; a mouth like opening. 2. (ARTHROPODA: Crustacea) In sessile Cirripedia, the opening in the wall occupied by the operculum; see aperture. 3. (BRYOZOA) The opening on the margin of the …   Dictionary of invertebrate zoology

  • kenozooid — n. [Gr. kenos, empty; zoon, animal; eidos, like] (BRYOZOA) 1. In Stenolaemata, a polymorph without a lophophore, gut, muscles, and orifice. 2. In Gymnolaemata, a polymorph without an orificial wall or equivalent, lophophore, alimentary canal, and …   Dictionary of invertebrate zoology

  • mandible — n. [L. mandibula, jaw] 1. A jaw. 2. (ANNELIDA: Polychaeta) The ventral chitinous plates or rods, maybe dentate, against which the maxilla work. 3. (ARTHROPODA: Crustacea) One of the third pair of cephalic appendages. 4. (ARTHROPODA: Diplopoda)… …   Dictionary of invertebrate zoology

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