TABLE 1. Upper molar metrics (mm) for apatemyids (Apatemys and Sinclairella) from Sioux County, Nebraska. Sources: 1, this study; 2, Clemens (1964); and 3, Ostrander (1987). Abbreviations: L, maximum anterior-posterior length; W, maximum transverse width.

Specimen number Locality Species Tooth L W Source
UMPC 13937 Sand Creek S. dakotensis M1 4.1 3.69 1
UMPC 14860 Whitehead Creek S. dakotensis M1 3.68 3.43 1
RAM 381 “anthills” sec. 26 S. dakotensis M1 4.1 3.5 2
UMPC 14862 Sand Creek S. dakotensis M2 3.73 4.63 1
RAM 1674 “anthills” sec. 26 S. dakotensis M2 3.4 4.2 2
UMPC 14190 Whitehead Creek Apatemys sp. M2 2.8 3.3 1
UMPC 14863 Sand Creek S. dakotensis M3 3.51 4.89 1
UMPC 14864 Sand Creek S. dakotensis M3 2.74a 3.4a 1
UMPC 14191 Whitehead Creek Apatemys sp. M3 1.8 2.8 1

aApproximate measurement based on damaged specimen.

 

TABLE 2. Lower molar metrics (mm) for apatemyids (Apatemys and Sinclairella) from Sioux County, Nebraska. Sources: 1, this study; 2, Clemens (1964); 3, Ostrander (1987). Abbreviations: L, maximum anterior-posterior length; Tri W, maximum transverse width across the trigonid; Tal W, maximum transverse width across the talonid.

Specimen number Locality Species Tooth L Tri W Tal W Source
UMPC 14861 Orella Road S. dakotensis m1 3.48 1.88 2.24 1
UMPC 13938 Sand Creek S. dakotensis m1 3.44 1.79 2.07 1
UMPC 14270 Whitehead Creek S. dakotensis m1 3.45 1.57 2.08 1
RAM 1000 “anthills” sec. 26 S. dakotensis m1 3.5 * 2.2 2
SDSM 10241-a Raben Ranch S. dakotensis m1 3.51 2.01 2.4 3
SDSM 10241-b Raben Ranch S. dakotensis m1 3.61 1.96 2.36 3
SDSM 10242 Raben Ranch Apatemys sp. m1 2.62 1.54 1.72 3
UMPC 13601 Sand Creek S. dakotensis m2 3.26a 1.84a 1.98a 1
UMPC 13869 Sand Creek S. dakotensis m2 3.5 2.74 2.59 1
UMPC 14866 Whitehead Creek S. dakotensis m2 3.65 2.42 2.36 1
UMPC 14865 Whitehead Creek S. dakotensis m2 * 2.3 * 1
RAM 598 “anthills” sec. 26 S. dakotensis m2 3.8 * 2.6 2
RAM 1001 “anthills” sec. 26 S. dakotensis m2 3.6 * 2.6 2
RAM 1079 “anthills” sec. 26 S. dakotensis m2 4 * 2.8 2
RAM 3013 “anthills” sec. 26 S. dakotensis m2 3.6 * 2.8 2
SDSM 10243 Raben Ranch S. dakotensis m2 4.07 * 3.05 3
SDSM 10245 Raben Ranch S. dakotensis m3 6.16 2.82 2.62 3

*Measurement not available. Clemens (1964) provided only length and maximum width. aApproximate measurement based on damaged specimen.