Uractinina Spencer and Wright, 1966

Blake, Daniel B. & Rozhnov, Sergei, 2007, Aspects of life mode among Ordovician asteroids: Implications of new specimens from Baltica, Acta Palaeontologica Polonica 52 (3), pp. 519-533 : 523

Suborder Uractinina Spencer and Wright, 1966

Remarks.— Spencer and Wright (1966) assigned the suborder Uractinina to the order Forcipulatida , which includes exclusively post−Paleozoic, crown−group suborders. A major extinction and rediversification event took place in asteroid evolution during the Paleozoic–Mesozoic transition ( Blake 1987; Gale 1987; Blake and Hagdorn 2003); Paleozoic taxa lacking the ambulacral−adambulacral arrangement of post−Paleozoic taxa should not be assigned to crown−group orders, but widely accepted ordinal concepts for the Paleozoic fauna are not available (e.g., Shackleton 2005).