Tube feet are soft tissues which are embedded within the ambulacral
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
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
This study also included measurements of ambulacral
plate size in D.
row 1 and interambulacral row 3.
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).
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
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.