ambulacrum

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ambulacrum

[‚am·byə′lak·rəm]
(invertebrate zoology)
In echinoderms, any of the radial series of plates along which the tube feet are arranged.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
On the actinal surfaces, there are five sets of plates at the mouth (mouth frame); each set is composed of two oral plates, one on each side of the ambulacral furrow.
Arrangement of the ambulacral pores enclosed in the internal fasciole.
columbiana fully extended its proboscis and maneuvered it deeply into one of the sea star's ambulacral grooves (Fig.
This study also included measurements of ambulacral plate size in D.
arm legth (mm); GA, ambulacral groove area ([mm.sup.2]); W, wet mass(g).
For instance, interambulacral areas were slightly stiffer than ambulacral areas in Echinus esculentus, and that difference influenced deformations and bending stresses calculated using finite element analysis (Philippi and Nachtigall, 1996).
Ambulacral fluid from starfish is sufficiently hyperosmotic to ambient seawater (about 6 mosmol [kg.sup.-1]) that some water would be drawn into this compartment from the medium, as well as from the perivisceral coelomic fluid (PCF) which is variably 1.5 mosmol [kg.sup.-1] more concentrated than seawater (Ferguson, 1990a).
The radial nerves and the aquiferous tubes provide the primary organization of the ambulacral zone of the oral surface of the juvenile.
For ophiuroids, a piece of arm was used; for echinoids, a portion of test was taken from the ambulacral groove area.
On the oral side, five pairs of elongate oral plates are present, one on each side of the radial canal, and five pairs of triradiate ambulacral spicules are present at the base of the tube feet.