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ambulacral

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adambulacral

Overview page. Subjects: Zoology and Animal Sciences.

In Echinodermata, applied to the ossicles and spines that occur at the outer ends of the ambulacral plates (see ambulacrum), with which they alternate.

See overview in Oxford Index

Asteroidea

Overview page. Subjects: Zoology and Animal Sciences.

; subphylum Asterozoa, class Stelleroidea)

A subclass which includes all extant starfish, characterized by the possession of poorly demarcated, broad arms containing a large...

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Asterozoa

Overview page. Subjects: Zoology and Animal Sciences — Earth Sciences and Geography.

(phylum Echinodermata)

A subphylum whose members have radial symmetry of projecting rays and a star-shaped body. It contains the one class Stelleroidea.

See overview in Oxford Index

Atelostomata

Overview page. Subjects: Zoology and Animal Sciences.

(subphylum Echinozoa, class Echinoidea)

A superorder of irregular echinoids characterized by the lack of compound ambulacra, Aristotle's lantern, girdle, or gill slits. The apical...

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Blastozoa

Overview page. Subjects: Earth Sciences and Geography.

(phylum Echinodermata)

A subphylum, whose validity is not universally accepted, that includes the extinct classes Eocrinoidea, Rhomoifera, Blastoidea, and Parablastoidea.

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Camerata

Overview page. Subjects: Earth Sciences and Geography.

(class Crinoidea)

Subclass of echinoderms (Echinodermata), with thecal plates typically united by rigid structures composed of numerous small, polygonal plates, and some lower...

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Cassiduloida

Overview page. Subjects: Zoology and Animal Sciences.

(subphylum Echinozoa, class Echinoidea)

An order of irregular echinoids that have petaloid ambulacra on the upper surface. The periproct is outside the apical system. There are...

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Cidaroida

Overview page. Subjects: Zoology and Animal Sciences.

(class Echinoidea, subclass Perischoechinoidea)

An order of regular echinoids that have a radially symmetrical, subspherical test. The ambulacra are in two columns, with each plate...

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circum-oral canal

Overview page. Subjects: Earth Sciences and Geography.

Part of the water-vascular system in echinoderms (Echinodermata). The madreporite allows water into a canal that feeds the circum-oral canal, located close to the upper surface of...

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Clypeasteroida

Overview page. Subjects: Zoology and Animal Sciences.

; subphylum Echinozoa, class Echinoidea)

An order of irregular echinoids with ambulacra that are wider than the interambulacra on the lower surface. Accessory tube feet are...

See overview in Oxford Index