: one of the areas between two ambulacra in an echinoderm.

What is an ambulacral in zoology?

In zoology, an ambulacrum is an elongated area of the shell of an echinoderm in which a row of tube feet are arranged. It is pluralized as ambulacra.

What are ambulacral plates?

Ambulacral zones are made of plates that are pierced by single or double pores for the tube-feet. These pore-pairs are situated along the outer (adambulacral) margins of the ambulacral zone. The central suture line between the two columns of plates in each ambulacral zone is the perradial suture line.