Jeffery, C. H. 1999 A reappraisal of the phylogenetic relationships of somaliasterid echinoids Palaeontology 42 1027-1041 Pygomalus_analis Cardiaster_granulosus Echinocorys_scutata Galeaster_bertrandi Guettaria_rocardi Labrotaxis_faxensis Brightonia_macfadyeni Iraniaster_douvillei Iraniaster_morgani Iraniaster_omanensis Leviechinus_gregoryi Coraster_vilanovae Cyclaster_pfenderae Hemiaster_bufo Linthia_sudanensis Mauritanaster_gentili Mecaster_fourneli Micraster_schroederi Opissaster_elongatus Osteology Maximum Parsimony Based on reanalysis of the original matrix. Jeffery_1999a