|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Asteroidea - Platyasterida - Urasterellidae
It was assigned to Uractinina by Blake and Guensburg (1993); to Uractinida by Sepkoski (2002); to Asteroidea by Dean Shackleton (2005); and to Urasterellidae by Blake and Rozhnov (2007).
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 T. E. Guensburg 1993||Five-armed, stoutly constructed asteroid; aboral numerous, small, stout, closely abutted; marginals in one row; proximal marginals much larger than aborals, vertically elongate, becoming similar in size, longitudinally elongate distally; marginals eaqual in number to adambulacrals proximally, more numerous distally; unpaired interbrachial marginal (i.e. axillary) abuts oral ossicular pair; adambulacral stout, broad, with flat outer face, spine base small, of equal size, ossicular furrow margin angular; ambulacral massive, with prominent transverse ridge separating broad podial basins; podial pores lacking; lateral articular facets in ridge-and-groove arrangements, these well developed on ambulacrals, adambulacrals; oral ossicles relatively small.|