Phylogenetic reduction of the snout in a series of basal Carnivora
This
(Fig 1) is a hypothetical phylogenetic series in the LRT, just three frames in a short repeating GIF movie featuring Eoarctos, Ailurus and Potos.
Figure 1. Eoarctos, Ailurus and Potos skulls aligned to show evolutionary changes in this small clade subset of the Carnivora.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/07/eoarctos2potos588.gif?w=296″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/07/eoarctos2potos588.gif?w=584″ tabindex=”0″ role=”button” class=”size-full wp-image-87705″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/07/eoarctos2potos588.gif” alt=”Figure 1. Eoarctos, Ailurus and Potos skulls aligned to show evolutionary changes in this small clade subset of the Carnivora.” width=”584″ height=”592″ />
Figure 1. Eoarctos, Ailurus and Potos skulls aligned to show evolutionary changes in this small clade subset of the Carnivora. Note the progress reduction of the snout, which is probably due to neotony, the retention of cute juvenile traits into adulthood and the reproductive = infant rearing phase.
Note the progress reduction of the snout,
(Fig 1) which is probably due to neotony, the retention of cute juvenile traits into adulthood and the reproductive = infant rearing phase.
Figure 1. Eoarctos (in blue) compared to scale with Nasua, the extant coatimundi, an ancestor to Ursus arctos, the grizzly bear.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2023/06/nasua_eoarctus_skeletons588.jpg?w=232″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2023/06/nasua_eoarctus_skeletons588.jpg?w=584″ tabindex=”0″ role=”button” class=”size-full wp-image-78725″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2023/06/nasua_eoarctus_skeletons588.jpg” alt=”Figure 1. Eoarctos (in blue) compared to scale with Nasua, the extant coatimundi, an ancestor to Ursus arctos, the grizzly bear.” width=”584″ height=”756″ />
Figure 1. Eoarctos (in blue) compared to scale with Nasua, the extant coatimundi, an ancestor to Ursus arctos, the grizzly bear.
Eoarctos vorax
(Wang et al. 2023, Early Oligocene) nests basal a portion of the Carnivora in the LRT. It is known from an almost perfectly preserved skeleton of a large male.
References
Wang X et al (5 co-authors) 2023. An exquisitely preserved skeleton of Eoarctos vorax (nov. gen. et sp.) from Fitterer Ranch, North Dakota (early Oligocene) and systematics and phylogeny of North American early arctoids (Carnivora, Caniformia). Journal of Vertebrate Paleontology, 42:sup1, 1-123, DOI: 10.1080/02724634.2022.2145900
Source: https://pterosaurheresies.wordpress.com/2024/07/25/phylogenetic-reduction-of-the-snout-in-a-series-of-basal-carnivora/
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