Philydrosaurus proseilus, Gao & Fox, 2005

Gao, Ke-Qin & Fox, Richard C., 2005, A new choristodere (Reptilia: Diapsida) from the Lower Cretaceous of western Liaoning Province, China, and phylogenetic relationships of Monjurosuchidae, Zoological Journal of the Linnean Society 145 (3), pp. 427-444 : 438

MONJUROSUCHIDAE AS A MONOPHYLETIC FAMILY

Two genera and species are currently classified in the family Monjurosuchidae : the type species Monjurosuchus splendens from the Yixian Formation exposed near Lingyuan, and Philydrosaurus proseilus gen. et sp. nov. described here from the Chiufotang Formation exposed near Chaoyang. With inclusion of these two taxa in a revised data set (Appendix 2), a parsimony analysis revealed that the monophyly of the family is supported by the following synapomorphies: dorsal process of squamosal absent (13-2; unknown for Hyphalosaurus and Shokawa ); supratemporal fenestra smaller than orbit (14-0; character reversal); infratemporal fenestra closed (15-1; homoplastic in Lazarussuchus , see Evans & Klembara, 2005); post-temporal fenestra absent (47-1; also in Simoedosauridae ); posterior process of ischium strongly developed (75-1; uniquely diagnostic for the family Monjurosuchidae ).