Parent taxon: Libristoma according to N.C. Hughes 1994
See also Sepkoski 2002
Sister taxa: none
Subtaxa: Aethodionide Ajacicrepida Alsataspididae Andrarinidae Anomocarellidae Aphelaspididae Asaphina Asaphoidea Auritamidae Bohemillidae Borogothus Borthaspis Boschchekulia Brandysops Bumastides Callaspis Camaraspoides Caulaspis Caznaia Ceratolithus Ceratopygidae Ceronocare Chondranomocare Clavatellus Cremastoglottos Cyclopygidae Cyclopygoidea Digrypos Dikelocephalacea Dikelocephalidae Dikelocephalinidae Dikelocephalopsis Dionididae Dipleuropyge Doremataspis Ectenaspis Eirelithus Elkia Elongatanileus Eoapatokephalus Eoptychaspis Eowuhuia Erbenia Eurekiidae Flabellocephalus Galerosaukia Glyphopeltis Gogiura Homalopyge Hukasawaia Hungaiidae Idahoiidae Isyrakopeltis Kaniniella Kazelia Kobayashella Kogenium Kokuria Lakaspis Liaoningella Lichengia Lingukainella Liostracinidae Lophoholcus Lycophron Lynaspis Macropygella Macrotoxus Mansuyella Mapanopsis Meeria Metayuepingia Monkaspididae Nadiyella Nanlingia Neopeltis Nileidae Nomadinis Norasaphus Notoaphelaspis Osceolia Paivinia Palella Parabolinoididae Parabumasttides Paraphillipsinella Paratrinucleus Pedinocephalina Pedinocephalus Plecteuloma Plesiyuepingia Portentosus Psalaspis Pseudocyclopyge Pseudoptyocephalus Pterocephaliidae Ptychaspididae Quitacetra Quitalia Raphiophoridae Remopleuridae Rhyssometopidae Rhyssometropus Richardsonellidae Saimachia Saukiidae Saukioides Scinocephalus Sigmakainella Sinosaukia Stenochilina Stigmacephaloides Taihungshaniidae Tchukeraspis Telaemarrolithus Temnoura Theodensia Toernquistina Tramoria Trinucleidae Walcottaspis Xenasaphus
Ecology: fast-moving low-level epifaunal deposit feeder