Palaeothentes compared to Labidolemur and Ottoryctes
Ingroup taxa are well known
form Miocene Palaeothentes (Figs 1, 2), all members of the Paucituberculata (Fig 2), close to the Apatemys clade.
Figure 1. Palaeothentes, Labidolemur and Ottoryctes compared to scale. Colors added here.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/palaeothentes_ottoryctes_labidolemur.skull588-1.jpg?w=300″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/palaeothentes_ottoryctes_labidolemur.skull588-1.jpg?w=584″ class=”size-full wp-image-90770″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/palaeothentes_ottoryctes_labidolemur.skull588-1.jpg” alt=”Figure 1. Palaeothentes, Labidolemur and Ottoryctes compared to scale. Colors added here. ” width=”584″ height=”446″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/palaeothentes_ottoryctes_labidolemur.skull588-1.jpg?w=584&h=446 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/palaeothentes_ottoryctes_labidolemur.skull588-1.jpg?w=150&h=115 150w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/palaeothentes_ottoryctes_labidolemur.skull588-1.jpg?w=300&h=229 300w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/palaeothentes_ottoryctes_labidolemur.skull588-1.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 1. Palaeothentes, Labidolemur and Ottoryctes compared to scale. Colors added here.
Palaeothentes lemoinei
(Ameghino 1887, Forasiepi et al 2014, MPM-PV 3566; Miocene) was considered a prehistoric shrew opossum (clade: Paucituberculata). Here Palaeothentes nests with Zalambdalastes. The skull is 2x wider than tall, the canines are smaller the last premolar is larger with a flat occlusal surface and the nasals split to form a zigzag suture with the frontals.
Figure 2. Palaeothentes compared to othe Paucitubercula members, including extant Caenolestes.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/rhyncholestes_caenolestes_tarsipes_skull588.jpg?w=101″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/rhyncholestes_caenolestes_tarsipes_skull588.jpg?w=346″ class=”size-full wp-image-90771″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/rhyncholestes_caenolestes_tarsipes_skull588.jpg” alt=”Figure 2. Palaeothentes compared to othe Paucitubercula members, including extant Caenolestes.” width=”584″ height=”1730″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/rhyncholestes_caenolestes_tarsipes_skull588.jpg?w=584&h=1730 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/rhyncholestes_caenolestes_tarsipes_skull588.jpg?w=51&h=150 51w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/rhyncholestes_caenolestes_tarsipes_skull588.jpg?w=101&h=300 101w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/01/rhyncholestes_caenolestes_tarsipes_skull588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 2. Palaeothentes compared to othe Paucitubercula members, including extant Caenolestes.
Forasiepi et al 2014 concluded,
“Compared to that of living caenolestids, the skull of Palaeothentes lemoinei has more plesiomorphic traits in the face, palate, and cranial vault than living paucituberculatans; whereas the dental morphology is more derived.”
Here
in the large reptile tree (LRT, 2328 taxa) Labidolemur and Ottoryctes (Figs 1) basal to placental hedgehogs like Erinaceus and Echinops.
References
Ameghino F 1887. Enumeracions sistematicad e las especies de mamiferos
fosiles coleccionados por Carlos Ameghino en los terranos eocenos de la Patagonia austral y depositados en el Museo La Plata. Boletin Museo de La Plata, 1:1-26.
Forasiepi AM, Sánchez-Villagra MR, Schmelzle T, Ladevèze S and Kay RF 2014. An exceptionally well-preserved skeleton of Palaeothentes from the Early Miocene of Patagonia, Argentina: new insights into the anatomy of extinct paucituberculatan marsupials. Swiss Journal of Palaeontology, 133(1):1-21.
wiki/Palaeothentes – not posted yet
wiki/Paucituberculata
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