Table of Contents

Vespertilionoidea, Family indet.:
Honrovits tsuwape
Type Specimen: Carnegie Museum of Natural History 62641, right dentary with p3-m3 and alveoli for p2 and c1.

Type Locality and Horizon: Carnegie Museum locality 1040, Quarry 6, Wind River Basin, Wyoming, USA; early Eocene (Lostcabinian, late Wasatchian), Lost Cabin Member, Wind River Formation.

Diagnosis (from Beard et al. 1992, who considered Honrovits to be a natalid): Differs from all other Chiroptera in having high, posteriorly recurved coronoid process and strong, distally projecting hypoconulid lobe on m3. Further differs from Archaeonycteridae, Palaeochiropterygidae and Hassianycteridae in having strong mesial and distal crests on p2, less transverse P4 with reduced lingual lobe, p4 simplified and low, centrocrista not reaching buccal border of upper molars, lower molars with more nearly median, cuspidate hypoconulid. Differs from Ageina in lacking paraconid and metaconid on p4. Differs from other natalids in having upper molars with centrocrista not reaching buccal border and with postprotocrista joining lingual base of metacone. Further differs from other natalids except possibly Ageina, Chadronycteris and Chamtwaria in having strongly reduced P3/p3.

Primary References: Beard et al. 1992

Vespertilionoidea, Family indet.:
Chadronycteris rabenae
Type Specimen: Museum of Geology, South Dakota School of Mines and Technology 9931, left maxilla with P4-M3.

Type Locality and Horizon: 2 miles SW of Orella, Sioux County, Nebraska, USA; late Eocene (middle Chadronian); middle member, Chadron Formation.

Diagnosis (from Ostrander 1983, who placed Chadronycteris in Vespertilionoidea: Kerivoulidae): P4 non-molariform, and three rooted; M1-M2 with prominent parastyle, mesostyle, and metastyle, paracone and metacone equal in height and taller than protocone, all three cusps V-shaped, hypocone position occupied by poorly developed cingulum, shallow central basin, poorly developed cingula; M3 with reduced parastyle and mesostyle, paracone taller than protocone, metacone reduced, all cingula reduced.

Primary References: Ostrander 1983