Trilobita - Asaphida - Asaphidae
Alternative spelling: Ptychocephalus
Synonym: Kirkella Kobayashi 1942
Full reference: L. Agassiz. 1843. Recherches Sur Les Poissons Fossiles. Tome I (18me livraison) 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, Asaphellus, Asaphinae, Atopasaphus, Aulacoparia, Australopyge, Basilicus, Bellefontia, Birmanites, Bohemopyge, Borogothus, Brachyaspis, Branisaspis, Burminresia, Ectenaspis, Emanuelaspis, Eoasaphus, Eoisotelus, Fuyunia, Gerasaphes, Gogiura, Griphasaphus, Guohongjunia, Homalopyge, Hunnebergia, Isabelinia, Isotelinae, Isyrakopeltis, Kainisiliellina, Kayseraspis, Klabavia, Kobayashia, Lachnostoma, Lisogorites, Lycophron, Merlinia, Metaptychopyge, Metayuepingia, Nahannia, Neopeltis, Nerudaspis, Nileoides, Ningkianites, Niobides, Niobina, Niobinae, Nobiliasaphinae, Nobiliasaphus, Norasaphus, Norinia, Ogmasaphus, Ogygiinae, Ogyginus, Ogygiocarinae, Ogygiocaris, Ogygites, Ogygitoides, Onchometopus, Parabellefontia, Paramegalaspis, Paratamdaspis, Penchiopsis, Plectasaphus, Popovkiaspis, Presbynileus, Priceaspis, Proasaphus, Promegalaspidinae, Proscharyia, Protopresbynileus, Protoptychopyge, Pseudasaphus, Pseudoasaphus, Pseudogriphasaphus, Pseudogygites, Pseudoptyocephalus, Psilocephalina, Ptychopyge, Ptychopyginae, Sanbernardaspis, Stegnopsis, Stenorhachis, Suriaspis, Tchukeraspis, Thysanopyge, Trigonocerca, Trigonocercella, Valdaites, Vogdesia, Xenasaphus, Xenostegium, Zhenganites, Zuninaspis
Subtaxa: Kirkella declevita Kirkella fillmorensis Kirkella yersini Ptyocephalus acclivus Ptyocephalus vigilans
Type: Ptyocephalus vigilans
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Whiterockian of United States (1: Nevada collection)
• Arenigian of United States (2: Utah)
• Arenig of United States (1: Nevada)
• Ordovician of Canada (4: Alberta, British Columbia), the Russian Federation (1), United States (63: California, Montana, Nevada, Utah)
• Canadian of United States (2: Utah)
• Tremadoc of Canada (14: Alberta)
• Ibexian of Norway (1), United States (1: Nevada)
Total: 90 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.