Perhaps the most important ossicular series defining the Asteroidea is the ambulacral column, found along the oral surface of the disk and radiating arms and associated with two or four rows of podia.
A morphological study of the problematic Ordovician stelleroid Stenaster and the paleobiology of the earliest asteroids and ophiuroids.
Gale, A. Phylogeny and classification of the Asteroidea (Echinodermata).
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