†subfamily Ptychagnostinae Kobayashi 1939 (artiopod)
Artiopoda - Agnostida - Agnostidae
Parent taxon: Agnostidae according to D. L. Bruton et al. 1984
Sister taxa: Acmarhachis, Agnostinae, Agnostus, Aistagnostus, Barrandagnostus, Biciragnostus, Connagnostus, Eurudagnostus, Formosagnostus, Gymnagnostus, Hadragnostus, Homagnostus, Idolagnostus, Ivshinagnostus, Kormagnostella, Kormagnostus, Kymagnostus, Lotagnostus, Micragnostus, Neoagnostus, Oncagnostus, Oxyagnostus, Peronopsinae, Quadrahomagnostus, Semagnostus, Strictagnostus, Trilobagnostus
Subtaxa: none
Ecology: slow-moving epifaunal detritivore
Distribution: there are no occurrences of Ptychagnostinae in the database