Herpetotherium marsupium Troxell, 1923a

Murphey, Paul C., 2019, PE Note: Corrigenda to Murphey et al. 2018, Palaeontologia Electronica (25 A) 21 (2), pp. 1-54 : 21-22

Herpetotherium marsupium Troxell, 1923a

1923 Herpetotherium marsupium ; Troxell, 1923a, p. 508, figures 1-2.

1928 Peratherium marsupium ; Simpson, p. 5, figure 4.

1975 Peratherium marsupium ; West and Dawson, p. 237.

1970 Peratherium cf. marsupium ; McGrew and Sullivan, p. 74.

1973 Peratherium cf. P. marsupium ; West, p. 80.

1975 Peratherium cf. P. marsupium ; Setoguchi, p. 264, figures 1-4.

1976 Peratherium marsupium ; Gazin, p. 2.

1981 Peratherium marsupium ; West and Hutchinson, p. 61.

1982 Peratherium cf. marsupium ; Bown, p. A43.

1982 Peratherium marsupium ; West, p. 2, figures 2a-b.

1982 Herpetotherium sp. , cf. H. marsupium ; Eaton, p. 162.

1983a Peratherium marsupium ; Krishtalka and Stucky, p. 214, figure 3.

1983b Peratherium marsupium ; Krishtalka and Stucky, p. 232.

1984 Peratherium marsupium ; Krishtalka and Stucky, p. 33, figure 1.

1984 Peratherium marsupium ; Storer, p. 16, figures 1c-f.

1996 Herpetotherium sp. , cf. H. marsupium ; Rothecker and Storer, p.772.

1996 Herpetotherium marsupium ; Storer, p. 245, 247.

1998 Peratherium marsupium ; Gunnell, p. 85, figure 2a.

2008 Herpetotherium marsupium ; Korth, p. 42.

Remarks. The holotype of Herpetotherium marsupium , a partial right dentary with p3-m3 (YPM 13518), came from an undetermined stratigraphic level (either Br2 or Br3) of the Bridger Formation in the Bridger Basin (Troxell, 1923a). Subsequently, numerous specimens of Herpetotherium marsupium have been recorded from the Blacks Fork and Twin Buttes members (biochrons Br2 and Br3) in the Bridger Basin (Gazin, 1976; Krishtalka and Stucky, 1983a, 1983b). Gunnell (1998) referred to Herpetotherium marsupium three specimens collected from exposures of the lowermost Bridger Formation (early Bridgerian, biochron Br1a = Bridger A of Matthew [1909]) in the northern portion of the Bridger Basin near the town of Opal. West and Hutchinson (1981) described a single upper molar (MPM 5888) of Herpetotherium marsupium from locality MPM 2970, which occurs low in the TBM on the southwest flank of Sage Creek Mountain. Herpetotherium marsupium has also been recorded from the early Eocene (late Wasatchian, biochron Wa6) through the middle Eocene (Duchesnean, biochron Du) of North America (Krishtalka and Stucky, 1983b; Korth, 2008), resulting in a geochronologic range of about 12.4 Ma. No additional specimens of this species were recovered from our study area of the TBM exposed on southwest flank of Cedar Mountain.