Megaconus hand and Carpolestes foot revised on a Daubentonia Bauplan
With a close interrelationship
between the extant aye-aye, Daubentonia, and extinct taxa like Middle Jurassic Megaconus and Late Palaeocene Carpolestes, that opens the door to interpreting scattered remains like the manus of Megaconus (Fig 1) and the pes of Carpolestes (Fig 2) based on anatomical dissections of Daubentonia (Figs 1, 2) that involve zero scattering.
Figure 1. DGS colors applied to the manus of the Middle Jurassic multituberculate, Megaconus, compared to the extant aye-aye, Daubentonia.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/09/megaconus-manus-insitu588.jpg?w=140″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/09/megaconus-manus-insitu588.jpg?w=476″ tabindex=”0″ role=”button” class=”size-full wp-image-88890″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/09/megaconus-manus-insitu588.jpg” alt=”Figure 1. DGS colors applied to the manus of the Middle Jurassic multituberculate, Megaconus, compared to the extant aye-aye, Daubentonia.” width=”584″ height=”1255″ />
Figure 1. DGS colors applied to the manus of the Middle Jurassic multituberculate, Megaconus, compared to the extant aye-aye, Daubentonia. With scattered digits in Megaconus, a suitable Bauplan is a helpful and probably necessary guide for reconstruction. Trait analysis will get you a Bauplan. Genomics will not.
These are Bauplan hypotheses
that now need to be confirmed, refuted or modified by duplicating this experiment or finding new fossils with un-scattered extremities.
Figure 2. Carpolestes toes reordered to match PIL patterns in Daubentonia.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/09/carpolestes-toes588.jpg?w=300″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/09/carpolestes-toes588.jpg?w=584″ tabindex=”0″ role=”button” class=”size-full wp-image-88888″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/09/carpolestes-toes588.jpg” alt=”Figure 2. Carpolestes toes reordered to match PIL patterns in Daubentonia. ” width=”584″ height=”356″ />
Figure 2. Carpolestes toes reordered to match PIL patterns in Daubentonia. Genomic studies do not help paleontologists figure out problemes like this. Only trait analysis can be used to compare living taxa to fossil taxa.
Traditionally
Daubentonia has been considered an aberrant basal primate. It lives on lemur island, Madagascar. Daubentonia nested with Megaconus basal to the placental 2 clade Multituberculata several years ago. Tree shrews, rodents, hedgehogs and shrews joined that clade more recently.
The large reptile tree (LRT, 2324 taxa) minimizes any possibility for taxon exclusion by testing so many taxa based on traits.
References
Geoffroy Saint-Hilaire E 1795.La décade philosophique, litteraire, et politique. Memoires d’Histoire Naturelle 4(28):193– 206.
Gmelin JF 1788. Caroli a Linné systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima tertia, aucta, reformata. – pp. [1-12], 1-500. Lipsiae. (Beer).
Simpson G G 1928. A new mammalian fauna from the Fort Union of southern Montana. American Museum Novitates 297:1-15.
Zhou CF, Wu S, Martin T, Luo ZX 2013. A Jurassic mammaliaform and the earliest mammalian evolutionary adaptations. Nature 500 (7461): 163. doi:10.1038/nature12429.
wiki/Carpolestes
wiki/Megaconus
wiki/Aye-aye – Daubentonia
Source: https://pterosaurheresies.wordpress.com/2024/09/25/megaconus-hand-and-carpolestes-foot-revised-on-a-daubentonia-bauplan/
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