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 ?
Both bare tests had a gently sloping aboral surface with the "high" side located arouud interambulacrum 3 (IA3) and the "low" side around ambulacrum I (AI, see Fig.
Synapomorphy: fasciole crossing the ambulacrum on plates 6 or 7.
In regular echinoids, each ambulacrum (or interambulacrum) closely resembles the other four, and thus the test displays pentamerous radial symmetry.
It is encased in the connective tissue and calcite ossicles of the ambulacrum and is dorsoventrally flattened in cross section [ILLUSTRATION FOR FIGURE 9 OMITTED].