Tupaia joins Microcebus at the origin of bats
I wrote this blogpost a few weeks ago, but kept it tucked away.
Today it is finally published online.
Recent housekeeping in the LRT
(large reptile tree, 2327 taxa) moved a few taxa about. Among them Tupaia (Fig 1) and Ptilocercus, two extant tree shrews moved closer to the bat branch of the LRT. Previously the extant mouse lemur, Microcebus (Fig 1), was the basalmost bat taxon, where it remains.
As in pterosaurs and birds, the wings came last in the clade Chiroptera.
Figure 1. Tupaia, Microcebus and an undescribed Green River bat (GRB) to scale. GRB enlarged to match the size of Microcebus. Here again, phylogenetic miniaturization attended the origin of a new clade.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/10/tupaia-origin-of-bats588.jpg?w=98″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/10/tupaia-origin-of-bats588.jpg?w=333″ class=”size-full wp-image-89217″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/10/tupaia-origin-of-bats588.jpg” alt=”Figure 1. Tupaia, Microcebus and an undescribed Green River bat (GRB) to scale. GRB enlarged to match the size of Microcebus. Here again, phylogenetic miniaturization attended the origin of a new clade. ” width=”584″ height=”1796″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/10/tupaia-origin-of-bats588.jpg?w=584&h=1796 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/10/tupaia-origin-of-bats588.jpg?w=49&h=150 49w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/10/tupaia-origin-of-bats588.jpg?w=98&h=300 98w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/10/tupaia-origin-of-bats588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 1. Tupaia, Microcebus and an undescribed Green River bat (GRB) to scale. GRB enlarged to match the size of Microcebus. Here again, phylogenetic miniaturization attended the origin of a new clade. That includes the short rostrum and large eyes due to neotony.
Bat experts
have been seeking a fossil basal bat with shorter fingers while ignoring extant wingless taxa that document even earlier stages.
Lesson for today: Stop wishing for your preconception and use what you have.
That’s the value of the LRT: so many taxa (2327 today) that one or two have to nest basal to bats in a proximal node. Let the cladogram do the work.
Figure 6. Subset of the LRT focusing on bats and their primate relatives.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/primates2024cladogram.jpg?w=106″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/primates2024cladogram.jpg?w=363″ class=”size-full wp-image-89800″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/primates2024cladogram.jpg” alt=”Figure 6. Subset of the LRT focusing on bats and their primate relatives.” width=”584″ height=”1646″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/primates2024cladogram.jpg?w=584&h=1646 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/primates2024cladogram.jpg?w=53&h=150 53w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/primates2024cladogram.jpg?w=106&h=300 106w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/11/primates2024cladogram.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 6. Subset of the LRT focusing on bats and their primate relatives.
References
Phylogenesis of the bat wing illustrated with ancestral taxa
A transitional series from water opossums to primates to tree shrews to bats
Source: https://pterosaurheresies.wordpress.com/2024/11/20/tupaia-joins-microcebus-at-the-origin-of-bats/
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