A revision of <em>Novacystis hawkesi</em> Paul and Bolton 1991 (Middle Silurian: Glyptocystitida, Echinodermata) and the phylogeny of early callocystitids

Sumrall, C. D. Brett, C. E. 2002 A revision of <em>Novacystis hawkesi</em> Paul and Bolton 1991 (Middle Silurian: Glyptocystitida, Echinodermata) and the phylogeny of early callocystitids Journal of Paleontology 76 733-740 Echinoencrinites Proctocystis Scoliocystis Jaekelocystis Lepadocystis Anartiocystis Novacystis Apiocystites Callocystites Brockocystis Pseudocrinites Osteology Maximum Parsimony Based on reanalysis of the original matrix. Sumrall_et_Brett_2002a