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.
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Number of plates of the posterior ambulacra (rows Ia and Vb) entering the subanal fasciole.
Correlatively, there is a strong alteration of the radiating pattern of the ambulacra. The differences that separate the two extreme ontogenetic stages of E.
Morphometrics and cladistics: measuring phylogeny in the sea urchin Echinocardium
The ambulacra (or interambulacra) may differ in morphology, and thus the outline of the test can be quite variable.
Together, these two papers provide a comprehensive model for the evolution of the characteristic features of the dendrasterid test, including the peristome, periproct, apical system, ambulacra, and interambulacra.
During development this condition is gradually altered such that in the adult all the ambulacra and all the interambulacra are almost equally well developed."
Each of the five ambulacra contains a pair of these plates (fig.
Retrodisplacement of the oral and anal openings in dendrasterid sand dollars

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