The Microsyops to Stylinodon clade
Tree topology keeps changing in the LRT
since adding Castor, the beaver, to the large reptile tree (LRT, 2328 taxa). Adding taxa is the only way to bring out overlooked interrelationships.
Microsyops to Groeberia to Stylinodon
(Fig 1) is the newest clade recovered by the LRT. Microsyops is supposed to be a plesidapiform. In the LRT it this clade precedes the Plesiadapiformes AND precedes the Multituberculata. Carpolestes is the proximal outgroup taxon. Extant Dactylopsila (Fig 1) is the next closest outgroup taxon.
Figure 1. The Microsyops to Stylinodon clade also incluedes Psittacotherium, Ectoganus and Groeberia. Extant Dactylopsila is the outgroup taxon. Note the transformation of the lower incisor into a predentary-type structure.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588.jpg?w=102″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588.jpg?w=348″ class=”size-full wp-image-90321″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588.jpg” alt=”Figure 1. The Microsyops to Stylinodon clade also incluedes Psittacotherium, Ectoganus and Groeberia. Extant Dactylopsila is the outgroup taxon. Note the transformation of the lower incisor into a predentary-type structure.” width=”584″ height=”1716″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588.jpg?w=584&h=1716 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588.jpg?w=51&h=150 51w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588.jpg?w=102&h=300 102w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 1. The Microsyops to Stylinodon clade also incluedes Psittacotherium, Ectoganus and Groeberia. Extant Dactylopsila is the outgroup taxon. Note the transformation of the lower incisor into a predentary-type structure. The posterior half of Groeberia is restored.
A little surprise…
Groeberia now nests in this new Microsyops – Stylinodon clade. That’s only a small move in the LRT.
Figure 2. The Microsyops to Stylinodon clade, this time to scale with three views of each skull.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588-1.gif?w=122″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588-1.gif?w=418″ class=”size-full wp-image-90326″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588-1.gif” alt=”Figure 2. The Microsyops to Stylinodon clade, this time to scale with three views of each skull.” width=”584″ height=”1431″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588-1.gif?w=584&h=1431 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588-1.gif?w=61&h=150 61w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588-1.gif?w=122&h=300 122w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/microsyops-stylinodon588-1.gif 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 2. The Microsyops to Stylinodon clade, this time to scale with three views of each skull.
In the LRT
little Microsyops was also related to the much larger tillodontids, Trogosus and Tillodon with its tiny eyes (Fig 3). Any guesses why the eyes were so small?
Figure 3. Trogosus and Tillodon are also related to Microsyops in the LRT.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/trogosus_skulls588.jpg?w=77″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/trogosus_skulls588.jpg?w=262″ class=”size-full wp-image-90328″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/trogosus_skulls588.jpg” alt=”Figure 3. Trogosus and Tillodon are also related to Microsyops in the LRT. ” width=”584″ height=”2281″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/trogosus_skulls588.jpg?w=584&h=2281 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/trogosus_skulls588.jpg?w=77&h=300 77w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/trogosus_skulls588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 3. Trogosus and Tillodon are also related to Microsyops in the LRT.
Microsyops annectens
(Leidy 1872; Marsh 1872; Silcox, Bloch, Boyer and Houd 2010; Middle Eocene) is a traditional plesiadapiform. Here it nests at the base of the Stylinodon clade.
This appears to be a novel hypothesis of interrelationships.
If not, please provide a citation so I can promote it here.
References
Leidy J 1872. Remarks on fossils from Wyoming: Proceedings of the Academy of Natural Sciences, Philadelphia 1872: 19–21.
Marsh OC 1872. Preliminary description of new Tertiary Mammals. Parts I– IV: American Journal of Science 4: 122–128, 202–224.
Silcox MT, Gunnelll GF and Bloch JI 2020. Cranial anatomy of Microsyops annectens (Microsyopidae, Euarchonta, Mammalia) from the middle Eocene of Northwestern Wyoming. Journal of Paleontology, 28pp. 0022-3360/20/1937-2337
doi: 10.1017/jpa.2020.24
Source: https://pterosaurheresies.wordpress.com/2024/12/08/the-microsyops-to-stylinodon-clade/
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