Echinoidea - Spatangoida - Hemiasteridae

Alternative spelling: Trachyaster

Full reference: A. Pomel. 1869. Revue des échinodermes et de leur classification pour servir d'introduction à l'étude des fossiles. Deyrolle, Paris 1-67

Parent taxon: Hemiaster according to P. M. Kier 1984

See also Fischer 1966 and Pomel 1883

Sister taxa: Hemiaster (Bolbaster), Hemiaster (Gregoryaster), Hemiaster (Hemiaster), Hemiaster (Holanthus), Hemiaster (Integraster), Hemiaster (Leymeriaster), Hemiaster aequisgranensis, Hemiaster alamedensis, Hemiaster amelianus, Hemiaster antillensis, Hemiaster arcolensis, Hemiaster arcticus, Hemiaster atavus, Hemiaster beecheri, Hemiaster bufo, Hemiaster californicus, Hemiaster calvini, Hemiaster cholamensis, Hemiaster comanchei, Hemiaster delawarensis, Hemiaster dewalquei, Hemiaster elegans, Hemiaster globulosus, Hemiaster gonzalezmunozi, Hemiaster hattaensis, Hemiaster humphreysanus, Hemiaster kuemmeli, Hemiaster moscovensis, Hemiaster orbignyi, Hemiaster oregonensis, Hemiaster parastatus, Hemiaster paronai, Hemiaster proclivus, Hemiaster regulusanus, Hemiaster sabinal, Hemiaster scutiger, Hemiaster sibiricus, Hemiaster stella, Hemiaster texanus, Hemiaster ungula, Hemiaster welleri, Hemiaster wetherbyi, Hemiaster zululandensis

Subtaxa: Hemiaster (Trachyaster) decipiens Hemiaster (Trachyaster) herrarae Hemiaster (Trachyaster) minutus

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Ecology: slow-moving shallow infaunal deposit feeder-detritivore

Distribution:

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