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Adambulacral :: Adambulacral (a.) Next to the ambulacra; as, the adambulacral ossicles of the starfish..

Pedata :: Pedata (n. pl.) An order of holothurians, including those that have ambulacral suckers, or feet, and an internal gill..

Spatangoidea :: Spatangoidea (n. pl.) An order of irregular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side..

Rosette :: Rosette (n.) Any structure having a flowerlike form; especially, the group of five broad ambulacra on the upper side of the spatangoid and clypeastroid sea urchins. See Illust. of Spicule, and Sand dollar, under Sand..

Ambulacral :: Ambulacral (a.) Of or pertaining to ambulacra; avenuelike; as, the ambulacral ossicles, plates, spines, and suckers of echinoderms..

Interambulacrum :: Interambulacrum (n.) In echinoderms, one of the areas or zones intervening between two ambulacra. See Illust. of Ambulacrum..

Interambulacral :: Interambulacral (a.) Of or pertaining to the interambulacra.

Micraster :: Micraster (n.) A genus of sea urchins, similar to Spatangus, abounding in the chalk formation; -- from the starlike disposal of the ambulacral furrows..

Antambulacral :: Antambulacral (a.) Away from the ambulacral region.

Interambulacra :: Interambulacra (pl. ) of Interambulacru.

Trivium :: Trivium (n.) The three anterior ambulacra of echinoderms, collectively..

Ambulacra :: Ambulacra (pl. ) of Ambulacru.

Asteridea :: Asteridea (n. pl.) A class of Echinodermata including the true starfishes. The rays vary in number and always have ambulacral grooves below. The body is star-shaped or pentagonal.

Petal :: Petal (n.) One of the expanded ambulacra which form a rosette on the black of certain Echini.

Bivium :: Bivium (n.) One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (trivium), which includes three ambulacra..

Pentremites :: Pentremites (n.) A genus of crinoids belonging to the Blastoidea. They have five petal-like ambulacra.

Ambulacriform :: Ambulacriform (a.) Having the form of ambulacra.

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