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Ptychopariina (Category) [Ptychopariida] ... Ptychopariina (Biology) [Ptychopariida] [Cambrian trilobites] Suborder of trilobites (fossil) ... Diceratocephalidae (Biology) [Trilobite families] [Ptychopariida] ... Ellipsocephaloidea (Biology) [Ptychopariida] [Redlichiida] Extinct superfamily of trilobites ... Meteoraspis (Biology) [Cambrian trilobites] [Ptychopariida] [Ptychopariida genera] A node may be present on the occipital ring ... Ptychopariida genera (Category) [Trilobite genera] [Ptychopariida] ... Lacorsalina (Biology) [Ordovician trilobites] [Ptychopariida] ... Conocoryphe (Biology) [Cambrian trilobites] [Ptychopariida genera] Genus of trilobites ... Cedaria (Biology) [Cambrian trilobites] [Ptychopariida genera] The backward occipital ring is well defined ... Sanaschtykgolia (Biology) [Cambrian trilobites] [Ptychopariida] It lived during the Botomian stage, which lasted from approximately 524 ... Pseudichangia (Biology) [Cambrian trilobites] [Ptychopariida genera] [Estaingiidae] It lived during the later part of the Botomian stage, which ... Mundocephalina (Biology) [Cambrian trilobites] [Ptychopariida genera] [Estaingiidae] It lived during the Botomian stage, which lasted from approximately 524 ... Paraorlovia (Biology) [Cambrian trilobites] [Ptychopariida genera] [Ptychoparioidea] ... Cedarapis (Biology) [Ptychopariida genera] ... Maryvillia (Biology) [Cambrian trilobites] [Ptychopariida genera] [Ptychopariida] ... Matania (Biology) [Cambrian trilobites] [Ptychopariida genera] [Ptychopariida] Genus of arthropods (fossil) ... Crepicephalus (Biology) [Cambrian trilobites] [Ptychopariida genera] ... Polycertaspis (Biology) [Cambrian trilobites] [Ptychopariida] ... Coosia (Biology) [Cambrian trilobites] [Ptychopariida] ... Triarthrus (Biology) [Ptychopariida genera] [Olenina] Genus of trilobite ... Diceratocephalus (Biology) [Cambrian trilobites] [Ptychopariida genera] ... Habrocephalus (Biology) [Ptychopariida] [Cambrian trilobites] ... Apomodocia (Biology) [Ptychopariida genera] [Cambrian trilobites] ... Cambroproteus (Biology) [Ptychopariida] [Cambrian trilobites] Genus of ptychopariid trilobite ... Coosina (Biology) [Cambrian trilobites] [Ptychopariida] Extinct genus of trilobite ... Cloacaspis (Biology) [Ptychopariida genera] [Olenina] Richard Fortey has proposed that these particular trilobites lived in anoxic ... Hatangia (Biology) [Cambrian trilobites] [Ptychopariida genera] [Proasaphiscidae] ... Angustaeva (Biology) [Ellipsocephalidae] [Ptychopariida genera] [Cambrian trilobites] ... Papyriaspis (Biology) [Cambrian trilobites] [Ptychopariida genera] [Ptychoparioidea] ... Alomataspis (Biology) [Cambrian trilobites] [Proasaphiscidae] [Ptychopariida genera] ...
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