(Stephanocrinus_angulatus,((Stephanocrinus_gemmiformis,((Codaster_acutus,(Angioblastus_wanneri,(Pterotoblastus_gracilis,(Nannoblastus_pyramidatus,((((Koryschisma_elegans,(Katoblastus_konincki,(Montanablastus_baldyensis,((Strongyloblastus_petalus,(Pentremites_godoni,(Ambolostoma_baileyi,Dentiblastus_sirius))),(Orbiblastus_hoskynae,(((((Arcuoblastus_shumardi,(Auloblastus_clinei,(Cribroblastus_cornutus,Decemoblastus_melonoides))),((Costatoblastus_sappingtonensis,(Mesoblastus_crenulatus,Tanaoblastus_roemeri)),(((Cryptoblastus_melo,Granatocrinus_granulatus),(Ptychoblastus_pustulosus,(Monadoblastus_granulosus,Poroblastus_granulosus))),(Ellipticoblastus_ellipticus,(Globoblastus_norwoodi,(Monoschizoblastus_rofei,Orbitremites_derbiensis)))))),(Euryoblastus_veryi,(Diploblastus_glaber,Perittoblastus_liratus))),(Deliablastus_cumberlandensis,(Heteroblastus_cumberlandi,((Elaeacrinus_venustus,(Nucleocrinus_meloniformis,Placoblastus_ehlersi)),(Lophoblastus_inopinatus,Schizoblastus_sayi))))),(Calycoblastus_tricavatus,(Devonoblastus_whiteavesi,(Eleutherocrinus_cassedayi,(Schizotremites_kopfi,(Hyperoblastus_filosus,(Pentremoblastus_conicus,(((Caryoblastus_bohemicus,(Decaschisma_pulchellum,(Leptoschisma_lorae,(Polydeltoideus_enodatus,(Pentremitidea_archiaci,Pleuroschisma_lycorias))))),(Cordyloblastus_eifelensis,Troosticrinus_reinwardti)),(Metablastus_wortheni,Tricoelocrinus_woodmani)))))))))))))),((Timoroblastus_coronatus,(Austroblastus_whitehousei,Notoblastus_stellaris)),(Cryptoschisma_schultzii,(Phaenoblastus_caryophyllatus,Phaenoschisma_laeviculum)))),(Astrocrinus_tetragonus,(Anthoblastus_stelliformis,Deltoblastus_permicus))),(Hadroblastus_whitei,(Brachyschisma_corrugatum,Orophocrinus_stelliformis))))))),(Heteroschisma_subtruncatum,Macurdablastus_uniplicatus))),(Stephanocrinus_hammeli,Stephanocrinus_osgoodensis)));