Thylophorops chapalmalensis (Ameghino 1908) Thylophorops lorenzinii (Goin et al. 2009; Pliocene, 5-3mya; MLP 08-III-10-1) was originally considered the largest didelphid. Here Thylophorops is a sister to Barinya, basal to Thylacinus.

Barinya wangala (Wroe 1999; Miocene) was considered the oldest member of the Dasyuridae, but here nests with Thylophorops.

Thylacinus cynocephalus (Temminck 1824; Eocene to recent) is a wolf-like marsupial that became extinct in 1936 due to hunting by humans. Thylalcinus is related to Sarcophilus, the Tasmanian devil, Dasyurus, the Australian quoll.

Goin FJ, Zimicz N, de los Reyes M and Soibelzon L 2009. A new large didelphid of the genus Thylophorops (Mammalia: Didelphimorphia: Didelphidae), from the late Tertiary of the Pampean Region (Argentina). Zootax ISSN 1175-5326 print. ISSN 1175-5334 online.

Leidy J 1871. Remains of extinct mammals from Wyoming. Proceedings of the Academy of Natural Sciences Philadelphia1871:113–117.

Rich TH, Flannery TF, Trusler P, Kool L, van Klaveren NA and Vickers-Rich P 2001. A second tribosphenic mammal from the Mesozoic of Australia. Records of the Queen Victoria Museum 110: 1-9.

Temminck CJ 1824. Monographies de Mammalogie Tom. 1. Paris: Dufour. 60-65..
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