Trilobita - Asaphida - Asaphidae

Alternative spelling: Ptychocephalus

Full reference: L. Agassiz. 1843. Recherches Sur Les Poissons Fossiles. Tome I (livr. 18). Imprimerie de Petitpierre, Neuchatel xxxii-188

Parent taxon: Asaphidae according to P. A. Jell and J. M. Adrain 2003

Sister taxa: Anataphrus, Araiocaris, Asaphellus, Asaphinae, Asaphus, Aulacoparia, Australopyge, Basilicus, Bellefontia, Birmanites, Bohemopyge, Brachyaspis, Branisaspis, Ekeraspis, Eoisotelus, Fuyunia, Gerasaphes, Griphasaphus, Guohongjunia, Hemigyraspis, Homotelus, Hunnebergia, Isabelinia, Isotelinae, Isoteloides, Isotelus, Kayseraspis, Klabavia, Kobayashia, Lachnostoma, Lapidaria, Liomegalaspides, Lisogorites, Megalaspidella, Megalaspides, Megistaspis, Merlinia, Nahannia, Nerudaspis, Nileoides, Niobe, Niobella, Niobides, Niobina, Niobinae, Nobiliasaphus, Norinia, Ogmasaphus, Ogygiinae, Ogyginus, Ogygiocarella, Ogygiocaris, Ogygites, Ogygitoides, Onchometopus, Parabellefontia, Paramegalaspis, Paratamdaspis, Penchiopsis, Plectasaphus, Presbynileus, Promegalaspides, Protopresbynileus, Pseudoasaphus, Pseudobasilicus, Pseudogriphasaphus, Pseudogygites, Pseudomegalaspis, Psilocephalina, Ptychopyge, Ptychopyginae, Sanbernardaspis, Schizophorus, Stegnopsis, Stenorhachis, Suriaspis, Thysanopyge, Trigonocerca, Trigonocercella, Vogdesia, Xenostegium, Zhenganites, Zuninaspis

Subtaxa: Ptyocephalus accliva, Ptyocephalus declevita, Ptyocephalus vigilans

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Type: Ptyocephalus vigilans

Ecology: fast-moving low-level epifaunal deposit feeder