Pucadelphys enters the LRT
Known from Early Paleocene fossils in Bolivia,
with a phylogenetic genesis in the early Jurassic, Pucadelphys andinus (Figs. 1-3), nests in the large reptile tree (LRT, 1870+ taxa) just prior to the extant arboreal didelphid, Caluromys (Figs. 3-4). These taxa nest as omnivores between the largely herbivorous marsupials and the largely carnivorous marsupials, not far from the omnivorous ancestors of placentals.
Later, Astúa et al. 2015
reported the first evidence of gregarious denning in didelphids supported by photos (Fig. 2)
Surprisingly
Pucadelphys phylogenetics are rather difficult to find. Pucadelphys is al so close to Caluromys geographically. Prepubes are present on both taxa.
References
Astúa D et al. 2015. First evidence of gregarious denning in opossums (Didelphimorphia, Didelphidae), with notes on their social behaviour. Biol. Lett. 11: 20150307.
http://dx.doi.org/10.1098/rsbl.2015.0307
Ladeveze S, de Muizon C, Beck R, Germain D and Cespedes-Paz R 2011. Earliest evidence of mammalian social behaviour in the basal Tertiary of Bolivia Nature, 474, 83-86 DOI: 10.1038/nature09987
Marshall LG and De Muizon C 1988. The Dawn of the Age of Mammals in South America. National Geographic Research 4:23-55.
Marshall LG, de Muizon C and Sigogneau-Russsell D 1995. Pucadelphys andinus (Marsupialia, Mammalia) from the early Paleocene of Bolivia. Part I: The locality of Tiupampa: age, taphonomy and mammal fauna. Mémoires du Muséum national d’histoire naturelle 165: 11–20.
https://www.nbcnews.com/id/wbna42960300
Source: https://pterosaurheresies.wordpress.com/2021/06/09/pucadelphys-enters-the-lrt/
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