|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Asteroidea - Hemizonida - Helianthasteridae
It was assigned to Lepidasteridae by Schuchert (1915); to Taeniactininae by Spencer (1927); to Helianthasterinae by Owen (1965); to Taeniactinidae by Spencer and Wright (1966); to Hemizonida by Sepkoski (2002); and to Helianthasteridae by Welsh (1984) and Blake (2009).
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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.
|J. R. Welsh 1984||Helianthasteridae with 24-35 arms; ambulacrals rectangular, counterparts on two sides of arm arranged opposite; adambulacrals wide, curved, offset from corre- sponding ambulacrals, with one to several spines; madreporite large, circular, aboral; aboral skeleton unknown.|