Stylinodontids are now pre-primates in the LRT
Only obvious in hindsight,
a series of stylinodontids (Fig 1) now nest as descendants of Late Eocene Agriochoerus latifrons, the ‘artiodactyl with thumbs’ (Fig 1), close to Notharctus (Fig 2), the basal-most primate in the large reptile tree (LRT, 2328 taxa).
These taxa are some of the most primitive placental1 taxa in the LRT. All are derived from Nasua, the extant coatimundi, which now nests as the last common ancestor of all placental1 taxa.
Figure 1. Agriochoerus latifrons is now basal to Lophiodon and the stylinodontids in the LRT.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/agriochoerus-stylinodon588-1.jpg?w=92″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/agriochoerus-stylinodon588-1.jpg?w=313″ class=”size-full wp-image-90492″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/agriochoerus-stylinodon588-1.jpg” alt=”Figure 1. Agriochoerus latifrons is now basal to Lophiodon and the stylinodontids in the LRT.” width=”584″ height=”1913″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/agriochoerus-stylinodon588-1.jpg?w=584&h=1913 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/agriochoerus-stylinodon588-1.jpg?w=46&h=150 46w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/agriochoerus-stylinodon588-1.jpg?w=92&h=300 92w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/agriochoerus-stylinodon588-1.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 1. Agriochoerus latifrons is now basal to Lophiodon and the stylinodontids in the LRT. Not to scale.
Earlier,
the large adapid = lemur from Madagascar, Megaladapis (Fig 2) was matched to Agriochoerus latifrons. Adding stylinodontids (Fig 1) came as a surprise and a solution. These were all herbivores.
Groeberia
(Fig 1) is a new addition. It was earlier mistakenly nested with Vintana and other odd marsupials.
Figure 1. Nasua, Notharctus and Megaladapis transition to Agriochoerus latifrons, the most primitive artiodactyl in the LRT. Note the diastema and upper fangs anterior to the lower fangs, not seen in other LRT taxa.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/megaladapis.agriochoerus_latifrons588.jpg?w=186″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/megaladapis.agriochoerus_latifrons588.jpg?w=584″ class=”size-full wp-image-90044″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/megaladapis.agriochoerus_latifrons588.jpg” alt=”Figure 1. Nasua, Notharctus and Megaladapis transition to Agriochoerus latifrons, the most primitive artiodactyl in the LRT. Note the diastema and upper fangs anterior to the lower fangs, not seen in other LRT taxa.” width=”584″ height=”940″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/megaladapis.agriochoerus_latifrons588.jpg?w=584&h=940 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/megaladapis.agriochoerus_latifrons588.jpg?w=93&h=150 93w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/megaladapis.agriochoerus_latifrons588.jpg?w=186&h=300 186w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/megaladapis.agriochoerus_latifrons588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 2. Nasua, Notharctus and Megaladapis transition to Agriochoerus latifrons, the most primitive artiodactyl in the LRT. Note the diastema and upper fangs anterior to the lower fangs, not seen in other LRT taxa.
So many updates
are sitting on the shelf, waiting for the mammal subset of the LRT to settle down and become fully resolved. The LRT changes daily as scores change.
This appears to be a novel hypothesis of interrelationships.
If not, please provide a citation so I can promote it here.
References
wiki/Stylinodon
wiki/Stylinodontidae
wiki/Agriochoerus
Artiodactyl with thumbs, Agriochoerus latifrons, now close to the giant lemur, Megaladaspis
Source: https://pterosaurheresies.wordpress.com/2024/12/17/stylinodontids-are-now-pre-primates-in-the-lrt/
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