|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Asteroidea - Valvatida - Ophidiasteridae
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.
|D. B. Blake and R. Reid 1998||Distinguished by interbrachial marginals slightly enlarged, approximately square in outline with enlarged marginal granule depressions lacking or nearly so; interbrachial series lacking, smaller ossicle not intercalated between large carinals. Ophidiasterid close to those of Ferdinia-group sensu Marsh and Campbell (1991). Arms, disk somewhat flattened (rather than columnar), a shape suggestive of that of goniasterids. Ossicles of primary series in well-defined longitudinal row with no scattered enlarged primary ossicles. Arm types, marginal, abactinal series clearly defined. Carinal row well defined; two lateral rows proximally, one row terminating at mid-arm. Marginals larger than abactinals, actinals; marginal rows without intercalated ossicles; inferomarginals larger proximally but ossicles of two series becoming approximately equisized distally. Ventral interbrachial areas large, with multiple ossicular rows. Furrow adambulacral spines flattened, elongate; six or more in palmate arrangement on each ossicles; subambulacral spines more robust than those of furrow series, flattened; granular tissue covering lacking.|