Dianoconodon enters the LRT as the most primitive mammal
Mao et al 2024b brought us news of
Dianoconodon youngi (Fig 1, IVPP V4257), an Early Jurassic “mammal ancestor”. However, when this taxon was added to the large reptile tree (LRT, 2318 taxa) it nested as the basal-most monotreme, which makes it the most primitive mammal tested by the LRT.
Note: The Mao et al paper is behind a paywall, but the images are available at ResearchGate.net. None of those include a cladogram.
Figure 1. From Mao et al 2024 b images of Dianoconodon (above) compared to Morganucodon (below). DGS colors added here.
” data-medium-file=”https://pterosaurheresies.files.wordpress.com/2024/04/dianoconodon-youngi-skull588-1.jpg?w=79″ data-large-file=”https://pterosaurheresies.files.wordpress.com/2024/04/dianoconodon-youngi-skull588-1.jpg?w=270″ class=”size-full wp-image-85245″ src=”https://pterosaurheresies.files.wordpress.com/2024/04/dianoconodon-youngi-skull588-1.jpg?w=584&h=2216″ alt=”Figure 1. From Mao et al 2024 b images of Dianoconodon (above) compared to Morganucodon (below). DGS colors added here.” width=”584″ height=”2216″ srcset=”https://pterosaurheresies.files.wordpress.com/2024/04/dianoconodon-youngi-skull588-1.jpg?w=584&h=2216 584w, https://pterosaurheresies.files.wordpress.com/2024/04/dianoconodon-youngi-skull588-1.jpg?w=79&h=300 79w, https://pterosaurheresies.files.wordpress.com/2024/04/dianoconodon-youngi-skull588-1.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 1. From Mao et al 2024 b images of Dianoconodon (above) compared to Morganucodon (below). DGS colors added here. In the LRT Morganucodon is an early marsupial.
Dianoconodon is much younger
than the oldest known mammals, which appeared in the Late Triassic and radiated widely by the Early Jurassic. So monotremes = mammals had an earlier and as yet undocumented first appearance and radiation than Early Jurassic Dianoconodon.
We looked at Dianoconodon and the mandible/ear transition here yesterday.
References
Mao F et al (8 co-authors) 2024b. Fossils document evolutionary changes of jaw joint to mammalian middle ear. Nature 1759(266):onlline
researchgate.net/publication
wiki/Dianoconodon – not yet posted
New Jurassic fossils reveal (again) that our hearing evolved from reptilian jawbones
Publicity
eurekalert.org/news-releases/1040018
newsweek.com/new-mammal-fossils-ears-teeth-1886471
Source: https://pterosaurheresies.wordpress.com/2024/04/10/dianoconodon-enters-the-lrt-as-the-most-primitive-mammal/
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