Valenopsalis joyneri, Sloan & Van Valen, 1965

Williamson, Thomas E., Brusatte, Stephen L., Secord, Ross & Shelley, Sarah, 2016, A new taeniolabidoid multituberculate (Mammalia) from the middle Puercan of the Nacimiento Formation, New Mexico, and a revision of taeniolabidoid systematics and phylogeny, Zoological Journal of the Linnean Society 177 (1), pp. 183-208 : 201

VALENOPSALIS JOYNERI ( SLOAN & VAN VALEN, 1965)

Holotype: UMVP 1494 , a right maxilla with M1, roots of P4.

Type locality and horizon: Bug Creek Anthills and Bug Creek West, Montana, USA.

Diagnosis: Differs from all other taeniolabidoids in having a p4 with two roots that are subequal in size, p4 length relatively greater compared with m1 length (p4L/m1L> 0.4), P3 present, the M1 internal cusp row length being between 50 and 80% of the length of the tooth, and the molar crown not being ornamented.