After Wang, Tedford & Taylor, 1999

Protomarctus Wang, Tedford & Taylor, 1999
        †Prototomarchus (lapsus calami)

        †Protomarctus optatus (Matthew, 1924)
            †Tephrocyon (Canis) temerarius (Leidy, 1858); Peterson, 1910 (CMNH 2404)
            †Tephrocyon temerarius (Leidy); Merriam, 1913 (CMNH 2404)
            †Tomarctus optatus Matthew, 1924
            †Tomarctus brevirostris (Cope, 1873); Downs, 1956
            †Tomarctus cf. T. optatus (Matthew); Galusha, 1975b
            †Tomarctus optatus Matthew; Skinner et al., 1977
            †Tomarctus optatus Matthew; Munthe, 1988
            †Tomarctus optatus Matthew, Munthe, 1998
            †Protomarctus optatus (Matthew); Wang, Tedford & Taylor, 1999

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