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 Blake 2018, Lehmann 1957, Owen 1965, Sepkoski 2002, Spencer 1951 and Spencer and Wright 1966
Sister taxa: Ambuloasteroidea, Arthrasteridae, Cryptozonia, Euasteroidea, Euaxosida, Hadrosida, Hunsrueckaster, Kermasida, Lepidasterella, Neopalaeasteridae, Petrasteridae, Phanerozoma, Phanerozonida, Platyasterida, Pleuraster, Proactis, Protarthraster, Pustulosida, Schuchertiidae, Silicaster, Spinulosacea, Trichotaster, Yarravaster
Subtaxa: Lepyriactinidae Palaeostellidae Taeniactinidae
Ecology: slow-moving low-level epifaunal carnivore
Distribution: found only at Gutterford Burn Starfish Bed, North Esk Inlier, Pentland Hills (Silurian of the United Kingdom)