Genus: Janumys EATON & CIFELLI, 2001
Etymology: Latin, Janus, Roman god with two faces and god of gates and beginnings, in reference to presumed placement of this taxon near the base of cimolodontans, and Greek, mys, "mouse"; Janus mouse.

Species: erebos EATON & CIFELLI, 2001
Etymology: Greek, erebos, a place of darkness in the nether world, an allustion to its morphological intermediacy between ‘plagiaulacidans’ and cimolodontans.

Holotype: OMNH 26623

Locality: OMNH V695, San Rafael Swell, Emery County, Utah.

Horizon: Member? Cedar Mountain Formation.

Biostratigraphy:

Age: Age?, Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch-Cenomanian Stage Boundary?, Upper Gallic subepoch, Lowest Gulf Epoch, Late Early to Early Middle Cretaceous.

Material: M1.

Referred material:

OMNH 27434, 27435, 27455, 27499, 29586, 29581, 33172, 33175, 33183, 33184, 34019: m1.

OMNH 33160: P4.

OMNH 26619, 27565, 29589, 33173: M1.

 

 

Locality: OMNH V235, San Rafael Swell, Emery County, Utah.

Horizon: Member? Cedar Mountain Formation.

Biostratigraphy:

Age: Age?, Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch-Cenomanian Stage Boundary?, Upper Gallic subepoch, Lowest Gulf Epoch, Late Early to Early Middle Cretaceous.

Material:

OMNH 25592: m1.

 

 

Locality: OMNH V794, San Rafael Swell, Emery County, Utah.

Horizon: Member? Cedar Mountain Formation.

Biostratigraphy:

Age: Age?, Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch-Cenomanian Stage Boundary?, Upper Gallic subepoch, Lowest Gulf Epoch, Late Early to Early Middle Cretaceous.

Material:

OMNH 33987: m1.

OMNH 30530: P4.

OMNH 30548: M1.

 

 

Locality: OMNH V801, San Rafael Swell, Emery County, Utah.

Horizon: Member? Cedar Mountain Formation.

Biostratigraphy:

Age: Age?, Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch-Cenomanian Stage Boundary?, Upper Gallic subepoch, Lowest Gulf Epoch, Late Early to Early Middle Cretaceous.

Material:

OMNH 29651: m1.

 

 

Locality: OMNH V868, San Rafael Swell, Emery County, Utah.

Horizon: Member? Cedar Mountain Formation.

Biostratigraphy:

Age: Age?, Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch-Cenomanian Stage Boundary?, Upper Gallic subepoch, Lowest Gulf Epoch, Late Early to Early Middle Cretaceous.

Material:

OMNH 33964: m2.

 


Locality: OMNH V868, San Rafael Swell, Emery County, Utah.

Horizon: Member? Cedar Mountain Formation.

Biostratigraphy:

Age: Age?, Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch-Cenomanian Stage Boundary?, Upper Gallic subepoch, Lowest Gulf Epoch, Late Early to Early Middle Cretaceous.

Material:

OMNH 32938, 32986: Partial P4.

 


= cf. Janumys erebos

Locality: OMNH V695, San Rafael Swell, Emery County, Utah.

Horizon: Mussentuchit Member, Uppermost Cedar Mountain Formation.

Biostratigraphy:

Age: Mussentuchitan age, Uppermost Albian-Lowermost Cenomanian Stage, Upper Gallic subepoch, Lowest Gulf Epoch, Late Early to Early Middle Cretaceous.

Material:

OMNH 26640, 29573: P4.