ambulacrum
/ˌambjʊˈleɪkrəm
/ /ˌambjʊˈlakrəm/noun (plural ambulacra /ˌambjʊˈleɪkrə/ /ˌambjʊˈlakrə/) Zoology
(In an echinoderm) each of the radially arranged bands, together with their underlying structures, through which the double rows of tube feet protrude.Furthermore, the placement of the ambulacra relative to the radials appears to be incorrect....
- It is contained by four rows of plates with the plates smaller along the dorsal side, probably indicating an ambulacrum.
- Four different groups of blastoids with moderately wide ambulacra evolved from groups with narrow ambulacra.
Derivatives
ambulacral
- The ambulacral grooves are narrow and the ambulacral ossicles are not exposed.
- In asteroids, the ambulacrals arch to form a deep ambulacral groove.
- Its wide ambulacral grooves and open filtration fan made it adapted for motile particle capture in a wide variety of environments.
Origin
Early 19th century: Latin, 'avenue', from ambulare 'to walk'.