ABSTRACT-Revision and redefinition of the Permian ammonoid genus Yinoceras Chao, 1954, is based upon examination
of the holotype of its type species, Y. lenticulare Chao, plus new material collected fro the Kungurian Dangchong Fomation
of central Hunan, China.  Yinoceras is a valid yinoceratin genus within the pseudohaloritid Superfamily Pseudohaloritoidea,
Suborder Tornoceratina, Order Goniatitida.