LEPORIDAE INDET.

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 : 18

LEPORIDAE INDET.

Referred specimens —From UCMP V 4830: ilium and ischium, UCMP 41204; proximal left third metatarsal, JODA 15318. From UCMP V 4832: proximal end of tibia, UCMP 41211; left upper and lower molars, UCMP 39299; left dentary with m1 and incisor, UCMP 39294. From UCMP V 4834: upper molars, JODA 4253 and JODA 4256; two lower molars, one upper molar, and 1 incisor, JODA 15294; proximal second metatarsal, JODA 15291; right partial calcaneum, JODA 15742. From JDNM-4*: upper molars, JODA 2325 and JODA 2327. From CIT 183*: 3 lower molars and 1 upper molar, CIT 4002; 5 premolars, CIT 4002A. From JDNM-266: 3 podial phalanges and terminal phalanx, JODA 15517. From JDNM-71: upper molar, JODA 3330.From JDNM-270: left calcaneum, JODA 15633.

Occurrence — UCMP V 4830, UCMP V 4832, UCMP V 4834, JDNM-4*, CIT 183*, JDNM-266 JDNM-71, JDNM-270.

Description —UCMP 41211, a proximal tibia measuring 13.75 mm anteroposteriorly and 13.75 mm transversly. Crenulate hypostria in the upper molars indicate that these specimens are not Archaeolagus , but could be

Hypolagus . Some of the molars listed above are within the size range of and could be attributed to H. fontinalus , while others are larger and could represent H. parviplicatus , but because they are not diagnostic they are not assigned to either species. Measurements for each tooth are included in Table 3. JODA 15633, a complete left calcaneum, has a length of 25.37 mm and width at the proximal end of 6 mm. JODA 15742, an incomplete right calcaneum, has a width of 4.52 mm at the proximal end.

Remarks — Downs (1956) identified CIT 4002, which includes a right p3, 4 right lower molars and one upper molar, as cf. H. vetus Kellogg, 1910 . The p3 is reidentified above as H. parviplicatus , but the remaining specimens are not identified further than Leporidae because they do not show diagnostic features. JODA 15633 confirms the presence of leporids in the upper member of the Mascall Formation, making this group one of only four that spans the entire formation. JODA 15742, also a calcaneum, is smaller than 15633, again indicating more than one species of leporids was present in the Mascall fauna.