Trilobita - Ptychopariida - Ptychopariidae

Synonym: Stauroholcus Resser 1939

Full reference: C. E. Resser. 1939. The Spence Shale and its fauna. Smithsonian Miscellaneous Collections 97(12):1-29

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

Sister taxa: Achlysopsis, Altikolia, Altitudella, Amecephalites, Asthenopsis, Austinvillia, Balangcunaspis, Bathyholcus, Billingsaspis, Binodaspis, Bolaspidina, Braintreella, Brunswickia, Caborcella, Cathayanella, Chengshanaspis, Conopolus, Danzhaina, Douposiella, Elrathina, Eokaotaia, Eokochaspis, Eoptychoparia, Eosoptychoparia, Eospencia, Gaphuraspis, Gedongaspis, Gunnia, Hadrocephalites, Jangudaspis, Jiagouia, Jialaopsis, Jianchangia, Jiumenia, Kaotaia, Kochaspis, Kochiella, Kochina, Kunmingaspis, Laminurus, Laoyingshania, Lyriaspis, Meitania, Mexicella, Monanocephalus, Mufushania, Nangaoia, Nangaops, Neoblairella, Nyella, Olenekina, Onchocephalites, Pachyaspis, Panacus, Paramecephalus, Paraperiomma, Parapoulsenia, Parashuiyuella, Paraziboaspis, Piaziella, Pingluaspis, Plagiura, Plesiamecephalus, Poulsenella, Poulsenia, Probowmania, Probowmaniella, Probowmanops, Proliostracus, Psilostracus, Ptychoparella, Ptychoparia, Qiaotouaspis, Regina, Ruichengella, Sanwania, Schistometopus, Semisphaerocephalus, Shantungaspis, Shuiyuella, Sinoptychoparia, Spencella, Stoecklinia, Suluktella, Syspacephalus, Tongshania, Townleyella, Trigonyangaspis, Tukalandaspis, Ulrichaspis, Vermontella, Volocephalina, Wanhuaia, Weijiaspis, Wuhaina, Xilingxia, Xingrenaspis, Yaojiayuella, Yuknessaspis, Ziboaspidella, Ziboaspis

Subtaxa: Spencia plena, Spencia typicalis, Stauroholcus typicalis

View classification

Type: Spencia typicalis

Ecology: fast-moving low-level epifaunal carnivore