†family Ptychaspididae Raymond 1924 (trilobite)

Trilobita - Asaphida - Ptychaspididae

Parent taxon: Asaphida according to H. B. Whittington et al. 1997

See also Adrain 2011 and Loch and Taylor 2004

Sister taxa: Aethodionide, Ajacicrepida, Anomocaridae, Asaphina, Asaphoidea, Borogothus, Borthaspis, Boschchekulia, Brandysops, Bumastides, Callaspis, Caulaspis, Ceratolithus, Clavatellus, Cremastoglottos, Cyclopygoidea, Digrypos, Dikelocephalacea, Dikelocephalinidae, Dikelocephalopsis, Dipleuropyge, Doremataspis, Eirelithus, Elkia, Elongatanileus, Eoapatokephalus, Eoptychaspis, Eowuhuia, Erbenia, Eurekiidae, Flabellocephalus, Galerosaukia, Glyphopeltis, Gogiura, Homalopyge, Hukasawaia, Hungaiidae, Isyrakopeltis, Kaniniella, Kobayashella, Kogenium, Kokuria, Lakaspis, Liaoningella, Lichengia, Lingukainella, Lophoholcus, Lynaspis, Macropygella, Macrotoxus, Mansuyella, Mapanopsis, Meeria, Metayuepingia, Nadiyella, Nanlingia, Neopeltis, Nomadinis, Notoaphelaspis, Osceolia, Paivinia, Palella, Parabumasttides, Paratrinucleus, Pedinocephalina, Pedinocephalus, Plecteuloma, Plesiyuepingia, Portentosus, Psalaspis, Pseudocyclopyge, Pseudoptyocephalus, Quitacetra, Quitalia, Remopleuridae, Rhyssometopidae, Rhyssometropus, Saimachia, Saukioides, Sinosaukia, Stigmacephaloides, Tchukeraspis, Telaemarrolithus, Temnoura, Theodensia, Toernquistina, Tramoria, Trinucleoidea, Walcottaspis, Xenasaphus

Subtaxa: Alborsella Changia Coreanocephalus Euptychaspis Idiomesus Imlerella Kathleenella Keithia Keithiella Macronoda Plectrella Promesus Proricephalus Ptychaspis Sunwaptia Wilcoxaspis

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Ecology: fast-moving low-level epifaunal deposit feeder

Distribution:

• Ordovician of Australia (1 collection), Canada (3: Newfoundland and Labrador, Yukon), China (1)

• Cambrian of Australia (5), Canada (36: Alberta, Newfoundland and Labrador, Quebec, Yukon), China (7), Iran (2), Turkey (1), United States (61: Idaho, Minnesota, Montana, Nevada, New Mexico, New York, Pennsylvania, South Dakota, Utah, Vermont, Wisconsin)

Total: 117 collections including 185 occurrences

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