Genus PACHYRHACHIS
Kingdom / Phylum . . . . . . . . Subphylum / Superclass . . . . Class / Subclass / Infraclass Division / Superorder / Order Suborder / Infraorder . . . . . . Superfamily / Family . . . . . . . Subfamily / Genus . . . . . . . . .	Animalia / Chordata Cephalochordata / Gnathostomata Reptilia / Diapsida / Lepidosauromorpha n.a. / Lepidosauria / Squamata Serpentes? / n.a. n.a. / Pachyophidae n.a. / Pachyrhachis
Age: Distribution:	Early Cretaceous Middle East
Depicted on: Guyana, 2004 (sheet margin)