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WCHS Zoology Chapter 16

Pentaradial symmetry a form of radial symmetry in the echindoerems in which body parts are arranged in fives around an oral-aboral axis.
water-vascular system A series of water-filled canals and muscular tube feet in echinoderms. Provides the basis for locomotion, food gathering, and attachment.
tube feet Muscular projections from the water-vascular systems of echinoderms that are used in locomotion, gas exchange, feeding, and attachment.
hemal system strand of tissue found in echindoerms. The hermal system is of uncertain function. It may aid in the transport of large molecules or coelomocytes, which engulf and transport waste particles within the body; distributes nutrients
dermal branchiae/papulae Thin folds of the body wall of a sea star that extend between ossicles and funciton in gas exchange and other exchange processes.
pedicellariae Pincerlike structures found on the body wall of many echinoderms. They are used in cleaning and defense; protective in nature.
ambulacral groove The groove along the length of the oral surface of a sea star arm. Ambulacral grooves contain tube feet.
bursae a membranous sac that invaginates from the oral surface of ophiuroid echinoderm. Functions in diffusion of gases and waste material.
aristole's lantern a series of ossicles making up the jawlike structure of echinoid echinoderms
respiratory trees a pair of tubules attached to the rectum of a sea cucumber that branch through the body cavity and function in gas exchange.
calyx 1. a boat-shaped or cuplike central body of an entoproct. the body and tentacles of an entoproct. 2. a cuplike set of ossicles that support the crown of a sea llily or feather star (class Crinoidea, phylum Echinodermata)
podid part of water vascular system
Created by: dmoudy