|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Asteroidea - Valvatida - Pycinasteridae
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|H. W. Rasmussen 1950||An asteroid whose interradial marginals have been tall, evenly tumid, more or less wedge-shaped and abactinally swollen. The marginals of the arm have been distinctly lower, evenly tumid and not wedge-shaped. The outer surface of the marginals has been covered by closely placed spine-pits. There is often also a larger facet for the attachment of a spine at the junction between the lateral and abactinal parts of the outer surface. The surface directed towards the body cavity is evenly curved and without irregularities.|