Ambulacral
one of the radial areas in an echinoderm, as the sea urchin, bearing the tube feet by which the creature moves.
Historical Examples
The ambulacral zones are depressed, leaving prominent elevations which make a very conspicuous figure on the top.
The Sea-beach at Ebb-tide Augusta Foote Arnold
ambulacral zones: The five areas containing the rows of tube-feet.
The Sea-beach at Ebb-tide Augusta Foote Arnold
Interambulacral areas: The five areas between the ambulacral zones.
The Sea-beach at Ebb-tide Augusta Foote Arnold
ambulacral grooves follow the center of all the arms and branches.
The Sea-beach at Ebb-tide Augusta Foote Arnold
In this family the ambulacral plates have but three pairs of pores.
The Sea-beach at Ebb-tide Augusta Foote Arnold
In both cases also we find the ocular spots at the tips of the ambulacral areas.
Elementary Zoology, Second Edition Vernon L. Kellogg
In this family the ambulacral plates have several pairs of pores.
The Sea-beach at Ebb-tide Augusta Foote Arnold
The same observations apply to smaller segments, and even to single detached rows of ambulacral feet.
Jellyfish, Starfish, and Sea-Urchins: Being a Research on Primitive Nervous Systems G. J. Romanes
The ambulacral zones, in five petal-like lines, form a distinct figure on the upper surface.
The Sea-beach at Ebb-tide Augusta Foote Arnold
ambulacral appendages take the form of: circumoral tentacles, sucking-feet, papillae; of these alone is always present.
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 Various
noun (pl) -ra (-rə)
any of five radial bands on the ventral surface of echinoderms, such as the starfish and sea urchin, on which the tube feet are situated
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