a) One or two rings of tooth-like appendages surrounding the opening of the capsule of many mosses.

Its removal does not, however, leave the mouth of the capsule wide open, for around the margin are two circles of pointed teeth forming the peristome.

b) The parts of or surrounding the mouths of numerous invertebrates.

We can distinguish therefore in the body of a polyp the column, circular or oval in section, forming the trunk, resting on a base or foot and surmounted by the crown of tentacles, which enclose an area termed the peristome, in the centre of which again is the mouth. The mouth may be level with the surface of the peristome, or may be projecting and trumpet-shaped.

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  • Peristome — Péristome Schéma montrant l’emplacement du péristome. Le terme péristome, qui nous vient directement de la langue grecque et veut dire « autour de la bouche », est employé pour décrire diverses structures entourant l’ouverture d un… …   Wikipédia en Français

  • péristome — [ peristɔm; peristom ] n. m. • 1803; de péri et gr. stoma « bouche » ♦ Bot. Couronne dentelée selon laquelle l opercule se détache de l urne (chez les mousses). ♢ Zool. Région qui entoure la bouche de certains animaux inférieurs. Spécialt Sillon… …   Encyclopédie Universelle

  • péristomé — péristomé, ée (pé ri sto mé, mée) adj. Terme de botanique. Qui est muni d un péristome …   Dictionnaire de la Langue Française d'Émile Littré

  • Peristome — Per i*stome, n. [Pref. peri + Gr. ?, ?, mouth.] 1. (Bot.) The fringe of teeth around the orifice of the capsule of mosses. It consists of 4, 8, 16, 32, or 64 teeth, and may be either single or double. [1913 Webster] 2. (Zo[ o]l.) (a) The lip, or… …   The Collaborative International Dictionary of English

  • peristome — [per′ə stōm΄] n. [ModL peristoma: see PERI & STOMA] 1. Bot. the fringe of teeth around the opening of the spore case in mosses 2. Zool. the area or parts surrounding the mouth or a mouthlike part of various invertebrates peristomial [per′istō′mē… …   English World dictionary

  • Peristome — The word peristome is derived from the Greek peri, meaning around or about , and stoma, mouth . It is a term used to describe various anatomical features that surround an opening to an organ or structure. The term is used in plants and… …   Wikipedia

  • Péristome — Schéma montrant l’emplacement du péristome …   Wikipédia en Français

  • peristome — noun Etymology: New Latin peristoma, from peri + Greek stoma mouth more at stomach Date: circa 1796 1. the fringe of teeth surrounding the orifice of a moss capsule 2. the region around the mouth in various invertebrates • peristomial adjective …   New Collegiate Dictionary

  • peristome — n. [Gr. peri, around; stoma, mouth] 1. The region surrounding the mouth. 2. (ANNELIDA) Segment modified to form part of the head and surround the mouth; buccal segments; see prostomium. 3. (ARTHROPODA: Insecta) Membranous tissue around the base… …   Dictionary of invertebrate zoology

  • peristome — peristomal, peristomatic /per euh steuh mat ik/, peristomial, adj. /per euh stohm /, n. 1. Bot. the one or two circles of small, pointed, toothlike appendages around the orifice of a capsule or urn of mosses, appearing when the lid is removed. 2 …   Universalium

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