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.
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.
Beadle (1989) measured the relative size of l SO ambulacral plate pairs in 30 Recent E.
In contrast, slopes and intercepts of ambulacral groove area relative (GA) to oral surface area (SA) or body mass (W) did not differ significantly between five-and six-armed bat stars (Fig.
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).
francis-canus were sufficiently large that individual tube feet could be seized with a hemostat, cut off, and drained into a centrifuge tube, and their ambulacral fluid (AF) analyzed in the same way.
The early juvenile stage [ILLUSTRATION FOR FIGURE 2L OMITTED] is characterized by a complete exteriorization of the stomodeal area and of the five ambulacral areas that end in primary podia.
huttoni, small squares of test from the ambulacral groove were surface sterilized and treated as above.
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.
The tube feet project from the ambulacral groove on the ventral surface of the arm; they are cylindrical and have conical ends.