pygomere
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asetal — adj. [Gr. an, without; L. seta, bristle] (ANNELIDA: Oligochaeta) Pertaining to being without setae; as in the peristomium and pygomere of earthworms … Dictionary of invertebrate zoology
periproct — n. [Gr. peri, around; proktos, the anus] 1. The distal piece or segment of the body containing the anus. 2. (ANNELIDA: Oligochaeta) The pygomere or pygidium. 3. (ARTHROPODA) see telson. 4. (ECHINODERMATA) The circular membrane containing the anus … Dictionary of invertebrate zoology