Belongs within: Blastoidea. The Codasteridae are a Devonian to Permian group of blastoids with eight hydrospire fields. Characters (from Beaver et al. 1967): Theca with eight exposed or constricted hydrospire fields; hydrospire slits lacking on anal side. <==Codasteridae [Angioblastidae] |–Emuhablastus Waters, Maples et al. 2003WM03 | `–*E. planus Waters, Maples et al. 2003WM03 |–Heteroschisma Wachsmuth… Continue reading Codasteridae
Category: Dichoporita
Callocystitidae
Belongs within: Glyptocystitida. The Callocystitidae are a group of Upper Ordovician to Upper Devonian cystoids distinguished from related groups by their particularly long ambulacra. Callocystitids: ambulacra advancement and rhomb reduction Published 10 January 2012 The Palaeozoic echinoderms included many distinctive groups that have no close relatives among the modern fauna: blastoids, cornutes, solutes, ctenocystoids… to… Continue reading Callocystitidae