interambulacrum


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interambulacrum

[¦in·tər‚am·byə′la·krəm]
(invertebrate zoology)
In echinoderms, an area between two ambulacra.
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.
The ''high side" is centered on interambulacrum 3 (e.g., contains genital plate 3).
In irregular echinoids, the periproct migrates from the apical system into the posterior interambulacrum. The periproct defines an anterior-posterior (or "longitudinal") axis, and the test displays bilateral symmetry about this axis.
Morphology of the Interambulacra.--In juvenile sand dollars, each oral interambulacrum is "continuous"; the interambulacral plates form an unbroken series from the peristome to the margin.
parma tests usually have at least one discontinuous interambulacrum (fig.
Periproct Position.--In irregular echinoids, the periproct lies between the two plate columns of the posterior interambulacrum (area 5).
The posterior interambulacrum (area 5) is discontinuous at a size of 9 mm, the posterior paired interambulacra (areas 1 and 4) are discontinuous at 18 mm, and the anterior paired interambulacra (areas 2 and 3) are discontinuous at 32 mm (Nisiyama 1968, fig.

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