ambulacral groove
A groove or furrow bordered by large spines extending along the oral surface of each arm of sea stars, that contain two to four rows of small tubular projections called feet or podia.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • Ambulacral — is a term typically used in the context of anatomical parts of the phylum Echinodermata or class Asteroidea. Echinoderms can have ambulacral parts that include ossicles, plates, spines, and suckers. For example, sea stars or star fish have an… …   Wikipedia

  • ambulacral ridge — (ECHINODERMATA: Asteroidea) The internal ridge of the external ambulacral groove …   Dictionary of invertebrate zoology

  • Crinoid — Crinoids Temporal range: Ordovician Recent …   Wikipedia

  • Madreporite — The madreporite is an opening used to filter water into the water vascular system of echinoderms. It is visible as a small red or yellow button like structure, looking like a small wart, on the aboral surface of the central disk of a starfish.The …   Wikipedia

  • brachiole — n. [L. dim. brachium, arm] (ECHINODERMATA: Crinoidea) The slender arm or arms extending from the ambulacral groove …   Dictionary of invertebrate zoology

  • lappet — n. [A.S. laeppa, a loose hanging part] 1. A fold, small flap, lobe or loose hanging portion. 2. (ARTHROPODA: Crustacea) In Mysidacea, a ventrally projecting subdivision of the pleura. 3. (CNIDARIA: Scyphozoa) A flaplike projection on the bell… …   Dictionary of invertebrate zoology

  • epineural canal — noun zoology : a canal derived from the ambulacral groove and running between the radial nerve and the external epithelium in ophiuroids and echinoids …   Useful english dictionary

  • Stelleroidea — Taxobox name = Stelleroidea image width = 250px image caption = Ochre Sea Star on beach at Olympic National Park regnum = Animalia phylum = Echinoderm superclassis = Stelleroidea subdivision ranks = Classes subdivision = Asteroidea Ophiuroidea… …   Wikipedia

  • echinoderm — /i kuy neuh derrm , ek euh neuh /, n. any marine animal of the invertebrate phylum Echinodermata, having a radiating arrangement of parts and a body wall stiffened by calcareous pieces that may protrude as spines and including the starfishes, sea …   Universalium

  • Helicoplacus — Taxobox name = PAGENAME fossil range = Early Cambrian image caption = regnum = Animalia phylum = Echinodermata classis = ordo = familia = genus = PAGENAME species = H. guthi binomial = binomial authority = Helicoplacus (often misspelled… …   Wikipedia

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