Miolabis, HAY, 1899

Maguire, Kaitlin Clare & Schmitz, Joshua X. Samuels and Mark D., 2022, The fauna and chronostratigraphy of the middle Miocene Mascall type area, John Day Basin, Oregon, USA, PaleoBios 35, pp. 1-51 : 34

MIOLABIS HAY, 1899

Miolabis transmontanus COPE, 1879

Referred specimens —Cottonwood Creek: nearly complete cranium, AMNH FM 8196; JDNM-4*: nearly complete mandible, JODA 1326.

Occurrence —Cottonwood Creek, JDNM-4*

Comments — AMNH FM 8196 is the type specimen ap (mm) t (mm)

i1 8.04 5.35

i2 8.45 5.16

i3 7.03 5.22

c 8.91 --

dia 39.76 --

p2 9.18 4.94

p3 13.47 5.87

p4 13.37 7.290

m1 15.14 12.31

m2 18.98 14.90

m3 28.24 13.70 for Miolabis transmontanus named by Cope (= Protolabis transmontanus ). Honey et al. (1998) used this specimen as the type for the genus. The skull was found by Charles Sternberg in the Cottonwood Creek area near Dayville, OR. Measurements for AMNH FM 8196 are presented in Cope (1879) and Downs (1956), and figured in Cope (1886). JODA 1326 is assigned to this species based on the following: no p1, premolars stouter and less compressed than Protolabis Cope, 1876, p2 shortened and simplified, p3 is shortened with a high, central protoconid, p4 has enlarged hypoconid, molars low-crowned, but they do not have strong metastylids (this may be due to the extreme wear of the teeth), m3 less anteroposteriorly expanded relative to m2 than in Protolabis . Measurements for JODA 1326 are included in Table 8. JODA 1326 may be the mandible to the skull found by Sternberg. Both specimens have heavily worn teeth, however, it is unclear where JODA 1326 was found.