Artiopoda - Corynexochida - Styginidae
Alternative spelling: Turgicephalus
Full reference: R. A. Fortey. 1980. The Ordovician trilobites of Spitsbergen. III. Remaining trilobites of the Valhallfonna Formation. Norsk Polarinstitutt Skrifter 171:1-163
Parent taxon: Raymondaspis according to A. T. Nielsen 1995
See also Jell and Adrain 2002 and Sepkoski 2002
Sister taxa: Raymondaspis angelini, Raymondaspis ardmillanensis, Raymondaspis gregarius, Raymondaspis limbatus, Raymondaspis nitens, Raymondaspis pingpong, Raymondaspis planus, Raymondaspis reticulatus, Raymondaspis turgidus, Raymondaspis vespertina
Subtaxa: Raymondaspis (Turgicephalus) neglecta Raymondaspis (Turgicephalus) whittingtoni Turgicephalus falcatus Turgicephalus hinlopensis
Type: Turgicephalus falcatus
Distribution: