Ptyocephalus Agassiz 1843 (trilobite)

Trilobita - Asaphida - Asaphidae

Alternative spelling: Ptychocephalus

Synonym: Kirkella Kobayashi 1942

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 2002

See also Fortey 1975, Lochman 1966, Peters 2003, Sepkoski 2002 and Whittington 1948

Sister taxa: Anataphrus, Araiocaris, Asaphellus, Asaphinae, Atopasaphus, Aulacoparia, Australopyge, Basilicus, Bellefontia, Birmanites, Bohemopyge, Brachyaspis, Branisaspis, Burminresia, Ectenaspis, Emanuelaspis, Eoasaphus, Eoisotelus, Fuyunia, Gerasaphes, Griphasaphus, Guohongjunia, Hemigyraspis, Homotelus, Hunnebergia, Isabelinia, Isotelinae, Kayseraspis, Klabavia, Kobayashia, Lachnostoma, Liomegalaspides, Lisogorites, Lycophron, Megalaspidella, Merlinia, Metaptychopyge, Mioptychopyge, Nahannia, Nerudaspis, Nileoides, Ningkianites, Niobella, Niobides, Niobina, Niobinae, Nobiliasaphus, Norasaphus, Norinia, Ogmasaphus, Ogygiinae, Ogyginus, Ogygiocarella, Ogygiocaris, Ogygites, Ogygitoides, Onchometopus, Parabellefontia, Paramegalaspis, Paratamdaspis, Penchiopsis, Plectasaphus, Presbynileus, Priceaspis, Promegalaspidinae, Proscharyia, Protopresbynileus, Protoptychopyge, Pseudasaphus, Pseudoasaphus, Pseudogriphasaphus, Pseudogygites, Psilocephalina, Ptychopyge, Ptychopyginae, Sanbernardaspis, Schizophorus, Stegnopsis, Stenorhachis, Suriaspis, Thysanopyge, Trigonocerca, Trigonocercella, Vogdesia, Xenostegium, Zhenganites, Zuninaspis

Subtaxa: Kirkella declevita Kirkella fillmorensis Kirkella yersini Ptyocephalus accliva Ptyocephalus vigilans

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Type: Ptyocephalus vigilans

Ecology: fast-moving low-level epifaunal deposit feeder

Distribution:

• Ordovician of Canada (17: Alberta, British Columbia collections), Norway (1), United States (47: California, Montana, Nevada, Utah)

• Whiterockian of United States (1: Nevada)

• Arenigian of United States (2: Utah)

• Cassinian of United States (1: Utah)

Total: 69 collections each including a single occurrence

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