Parent taxon: Libristoma according to A. Bignon et al. 2020
See also Bengtson 1992, Briggs et al. 2008, Fortey 1990, Harrington and Leanza 1957, Landing et al. 2008, Loch 2007, Sepkoski 2002, Sundberg 1994, Sundberg and McCollum 2000 and Sundberg and McCollum 2003
Sister taxa: Asaphida, Trinucleida
Subtaxa: Acrocephalitidae Alokistocaridae Amphorella Atratebiinae Bifodina Bolaspididae Bulnibarbi Bvalbardites Catillicephalidae Chondrastaulina Chuangiformis Cliffiidae Conococheaquea Conocoryphidae Conokephalinidae Crepicephalidae Diceratocephalidae Elviniidae Harpina Indiligens Jamrogiidae Kazelina Kingstoniidae Kirengelia Lisaniidae Lonchocephalidae Lorenzellidae Marjumiidae Meniscocorphye Meniscocoryphe Menomoniidae Neoanomocerella Nepeidae Norwoodiidae Olenina Onchonotopsidae Papyriaspididae Phylacteridae Plethopeltidae Proasaphiscidae Propeltura Ptychopariidae Ptychopariina Ptychoparoides Raymondinidae Shumardiidae Solenopleuracea Solenopleuridae Tricrepicephalidae Xianquianaspis Yuehsieszella
Ecology: fast-moving low-level epifaunal carnivore