Crested Agriochoerus latifrons now nests with crested Lophiodon
Lately
changes to the LRT have revolved around Lophiodon (Figs 1, 2). This time Lophiodon is compared to Agriochoerus latifrons (Figs 1, 2). Both lived during the Eocene as part of an earlier radiation of herbivore placentals.
Figure 1. Skeletons of Lophiodon and Agriochoerus latifrons. Note the vestigial manual digit 1 on Agriochoerus, missing in Lophiodon.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/07/lopiodon.agriochoeus.latifrons.skeletons588.jpg?w=253″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/07/lopiodon.agriochoeus.latifrons.skeletons588.jpg?w=584″ tabindex=”0″ role=”button” class=”size-full wp-image-87586″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/07/lopiodon.agriochoeus.latifrons.skeletons588.jpg” alt=”Figure 1. Skeletons of Lophiodon and Agriochoerus latifrons. Note the vestigial manual digit 1 on Agriochoerus, missing in Lophiodon. ” width=”584″ height=”692″ />
Figure 1. Skeletons of Lophiodon and Agriochoerus latifrons. Note the vestigial manual digit 1 on Agriochoerus, missing in Lophiodon.
Agriochoerus latifrons
(Leidy 1869; Late Eocene to Oligocene, 38–16mya, skeleton) has a distinctly different tooth pattern with large lateral incisors (convergent with Elephas) and a diastema. Here the canine is tiny behind a fang-like incisor.
Figure 2. Agriochoerus latifrons compared to the much larger Lophiodon.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/07/agriochoerus-lophiodon.skulls588.jpg?w=204″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/07/agriochoerus-lophiodon.skulls588.jpg?w=584″ tabindex=”0″ role=”button” class=”size-full wp-image-87588″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/07/agriochoerus-lophiodon.skulls588.jpg” alt=”Figure 2. Agriochoerus latifrons compared to the much larger Lophiodon.” width=”584″ height=”858″ />
Figure 2. Agriochoerus latifrons compared to the much larger Lophiodon. The resemblance is reflected in LRT scores.
Lophiodon ballardi
(Cuvier 1822, Holbrook 2009, originally Tapirotherium Blainville 1817, Eocene) is traditionally considered a chalicothere or a tapir. Here it nests with Agriochoerus latifrons far from the tapirs even though the limbs are short and robust.
Figure 3. Coryphodon subset of the LRT reflecting recent changes. This could and probably will change again.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/07/coryphodon.clade588-1.jpg?w=77″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/07/coryphodon.clade588-1.jpg?w=263″ tabindex=”0″ role=”button” class=”size-full wp-image-87599″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/07/coryphodon.clade588-1.jpg” alt=”Figure 3. Coryphodon subset of the LRT reflecting recent changes. This could and probably will change again.” width=”584″ height=”2270″ />
Figure 3. Coryphodon subset of the LRT reflecting recent changes. This could and probably will change again.
This change also moves a raft of taxa
from the marsupials to the placentals in the large reptile tree (LRT, 2322 taxa, subset Fig 3). Recent changes have been both hard to come by and fragile, due to convergence.
Lophiodon is still not a chalicothere nor a perissodactyl.
References
Cuvier G 1822. Recherches sur les Ossemens Fossiles (Nouvelle Edition)2(1): Chez G. Dufour et E. D’Ocagne, Paris, France.
Holbrook LT 2009. Osteology of Lophiodon Cuvier, 1822 (Mammalia Perissodactyla) and its phylogenetic implications. Journal of Vertebrate Paleontology 29(1):212–230.
Leidy J 1869. Extinct Mammals of Dakota and Nebraska:Including an account of some allied forms from other localities, together with a synopsis of the mammalian remains of North America., Journal of the Academy of Natural Sciences, Philadelphia 2(7): 135–141.
wiki/Agriochoerus
wiki/Lophiodon
Source: https://pterosaurheresies.wordpress.com/2024/07/17/crested-agriochoerus-latifrons-now-nests-with-crested-lophiodon/
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