Peristethium see mesosternum

peristigmatic glands (ARTHRO: Insecta) Glands that secrete a hydrophobic material preventing wetting of the spiracles.

peristome n. [Gr. peri, around; stoma, mouth] 1. The region surrounding the mouth. 2. (ANN) Segment modified to form part of the head and surround the mouth; buccal segments. see prostomium. 3. (ARTHRO: Insecta) Membranous tissue around the base of the mouth. 4. (bryo) Modifications of the area around the orifice. 5. (ECHINOD: Ophi-uroidea) Membranous area surrounding the mouth; on the aboral surface of the jaw. 6. (MOLL: Gastropoda) Thickened rim or lip around the mouth; the margin of the aperture.

peristomium n. [Gr. peri, around; stoma, mouth] (ANN: Oli-gochaeta) The lateral and ventral margins of the mouth, behind the prostomium.

perisympathetic system (ARTHRO: Insecta) Neurohemal organs connected to the transverse nerves of the ventral sympathetic nervous system, that release the products of the neurosecretory cells in the ventral ganglia.

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