Unarmored armadillo ancestors in the LRT
Short one today
as the graphics (Figs 1,2) tell the tale.
Figure 1. An extinct armadillo, Holmesina, and its unarmored ancestors back to tiny Asioryctes.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/05/holmesina_skull_anagale.jpg?w=292″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/05/holmesina_skull_anagale.jpg?w=584″ class=”size-full wp-image-93062″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/05/holmesina_skull_anagale.jpg” alt=”Figure 1. An extinct armadillo, Holmesina, and its unarmored ancestors back to tiny Asioryctes. ” width=”584″ height=”601″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/05/holmesina_skull_anagale.jpg?w=584&h=601 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/05/holmesina_skull_anagale.jpg?w=146&h=150 146w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/05/holmesina_skull_anagale.jpg?w=292&h=300 292w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/05/holmesina_skull_anagale.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 1. An extinct armadillo, Holmesina, and its unarmored ancestors to scale back to tiny Asioryctes. Only Asioryctes had a true canine. The others had a canine-like premolar transformed in Holmesina into a flat crushing tooth.
Macrotis is a living marsupial
known as a bilby – a late survivor of a much earlier ?Mesozoic radiation. Asioryctes is from the Middle Cretaceous (Albanian Campanian).
Figure 2. Tiny Leptictis compared to armored Holmesina.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/holmesina_overall588.jpg?w=154″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/holmesina_overall588.jpg?w=526″ class=”size-full wp-image-90439″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/holmesina_overall588.jpg” alt=”Figure 2. Tiny Leptictis compared to armored Holmesina.” width=”584″ height=”1137″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/holmesina_overall588.jpg?w=584&h=1137 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/holmesina_overall588.jpg?w=77&h=150 77w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/holmesina_overall588.jpg?w=154&h=300 154w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/12/holmesina_overall588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 2. Tiny Leptictis compared to armored Holmesina from 2024.
According to Wikipedia,
“Holmesina is an extinct genus of pampathere, a group of armadillo-like xenarthrans that were distantly related to extant armadillos.”
By contrast
in the large reptile tree (LRT, 2338 taxa) Holmesina is either an armadillo (Dasypus) ancestor (or the two had an unknown armored last common ancestor). In the LRT Leptictis (Figs 1, 2) is that known and tested last common ancestor. It had a convex arched spine, retained in Holmesina.
References
wiki/Holmesina
Source: https://pterosaurheresies.wordpress.com/2025/05/31/unarmored-armadillo-ancestors-in-the-lrt/
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