Zaisanamynodon Belyaeva, 1971

Genus Zaisanamynodon Belyaeva, 1971

Procadurcodon Gromova (Nomen nudum) 1960: 129.

Zaisanamynodon Belyaeva, 1971: 43 .

TYPE SPECIES. — Zaisanamynodon borisovi Belyaeva, 1971 .

INCLUDED SPECIES. — Zaisanamynodon protheroi Lucas, 2006 .

EMENDED DIAGNOSIS. — Within Cadurcodontini , Zaisanamynodon differs from other genera ( Cadurcotherium , Amynodontopsis Stock, 1933 , and Cadurcodon Kretzoi, 1942 ) by the presence of a third posterior loph on P4. Zaisanamynodon differs from Cadurcotherium by the absence of cement on cheek teeth, an oblique hypolophid on lower molars and a long metastyle on M1-2. Zaisanamynodon differs from Amynodontopsis in having a postfossette on M1 and the absence of a sagittal crest on the basilar process. Zaisanamynodon differs from Cadurcodon in having a well-developed coronoid process of the mandible, the presence of i1, a long metastyle on M1-2 and a weak paracone fold on M1-2.

DIAGNOSIS DISCUSSION. — Belyaeva (1971) and Lucas et al. (1996) mentioned the presence of a third loph on P 4 in Zaisanamynodon borisovi and Lucas (2006) observed this characteristic in Zaisanamynodon protheroi . He considered this feature as a distinct trait of Zaisanamynodon from other genera of Metamynodontini , to which Zaisanamynodon formerly belonged.In fact, this character can be used to distinguish Zaisanamynodon from all genera of Amynodontidae .