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; class Stelleroidea, subclass Asteroidea)

An order of starfish that are characterized by the arrangement of arm ossicles in transverse rows, from axial elements (adambulacrals, ambulacrals) laterally. Only one row of marginal ossicles is present. There are three genera, two Palaeozoic and one Holocene.

Subjects: Zoology and Animal Sciences.

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