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.
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.
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.
In Dendraster and Merriamaster, the discontinuous condition appears at about the same time in each interambulacrum (fig.