†family Phragmactinidae Spencer 1951
Alternative spelling: Phragmactidae
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: Asterozoa according to D. B. Blake 2014
See also Owen 1965, Spencer 1951 and Spencer and Wright 1966
Sister taxa: Asteroidea, Catervaparmasteridae, Eopentaroida, Falloasteridae, Ophiuroidea, Somasteroidea, Stenuroidea, Auluroidea
Subtaxa: Phragmactis Swataria
Type: Phragmactis
Distribution:
• Ordovician of the United Kingdom (1 collection), United States (2: Pennsylvania)
Total: 3 collections each including a single occurrence