†order Hemizonida Spencer 1951

Asteroidea - Hemizonida

Alternative spelling: Hemizonina

Synonym: Gnathasterina Spencer 1951

Full reference: W. K. Spencer. 1951. Early Palaeozoic starfish. Philosophical Transactions of the Royal Society of London, series B 235(B623):87-129

Parent taxon: Asteroidea according to D. B. Blake 1989

See also Lehmann 1957, Owen 1965, Sepkoski 2002, Spencer 1951 and Spencer and Wright 1966

Sister taxa: Ambuloasteroidea, Arthrasteridae, Cryptozonia, Eriaster, Euasteroidea, Euaxosida, Fandasteridae, Hudsonasteridae, Kermasida, Lepidasteridae, Neopalaeasteridae, Omanasteridae, Petraster, Phanerozoma, Phanerozonida, Platyasterida, Pleiadeaster, Pleuraster, Promopalaeaster, Promopalaeasteridae, Protasteracanthion, Pustulosida, Spinulosacea, Trichotaster, Uranasteridae, Zorocallida

Subtaxa: Helianthasteridae Lacertasterias Lepyriactinidae Palaeostellidae Schondorfia Taeniactinidae

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Distribution:

• Carboniferous of United States (3: Illinois, Iowa, Montana collections)

• Devonian of Canada (1: Ontario), Germany (1)

• Silurian of the United Kingdom (1)

Total: 6 collections including 9 occurrences

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