Several revisions part 5
Here we go again,
several updates to the mammal subset of the LRT (Figs 1–3).
Figure 1. Two distinctly different Nandinia (palm civet) skulls here compared to Eoarctos to scale.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/nandinia.digimorph.skull588.jpg?w=300″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/nandinia.digimorph.skull588.jpg?w=584″ class=”size-full wp-image-94251″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/nandinia.digimorph.skull588.jpg” alt=”Figure 1. Two distinctly different Nandinia (palm civet) skulls here compared to Eoarctos to scale. ” width=”584″ height=”452″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/nandinia.digimorph.skull588.jpg?w=584&h=452 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/nandinia.digimorph.skull588.jpg?w=150&h=116 150w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/nandinia.digimorph.skull588.jpg?w=300&h=232 300w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/nandinia.digimorph.skull588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 1. Two distinctly different Nandinia (palm civet) skulls here compared to Eoarctos to scale.
Figure 2. Tremarctos, the spectacled bear from the Andes Mountains of South America, here compared to a close relative, Aiiuropoda, the panda, from the Himalayas in China. Last common ancestor is the red panda, Ailurus. So this is an ancient lineage, diverging prior to the separation of South America from other Gondwana continents in the Early Cretaceous.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/tremarctos-ailuropoda.jpg?w=235″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/tremarctos-ailuropoda.jpg?w=584″ class=”size-full wp-image-94253″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/tremarctos-ailuropoda.jpg” alt=”Figure 2. Tremarctos, the spectacled bear from the Andes Mountains of South America, here compared to a close relative, Aiiuropoda, the panda, from the Himalayas in China. Last common ancestor is the red panda, Ailurus. So this is an ancient lineage, diverging prior to the separation of South America from other Gondwana continents in the Early Cretaceous.” width=”584″ height=”747″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/tremarctos-ailuropoda.jpg?w=584&h=747 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/tremarctos-ailuropoda.jpg?w=117&h=150 117w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/tremarctos-ailuropoda.jpg?w=235&h=300 235w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/tremarctos-ailuropoda.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 2. Tremarctos, the spectacled bear from the Andes Mountains of South America, here compared to a close relative, Aiiuropoda, the panda, from the Himalayas in China. Last common ancestor is the red panda, Ailurus. So this is an ancient lineage, diverging prior to the separation of South America from other Gondwana continents in the Early Cretaceous.
Figure 3. Extant Monodelphis kunsi compared to scale with Early Cretaceous Acristatherium.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/monodelphis-kunsi-acristatherium588.jpg?w=300″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/monodelphis-kunsi-acristatherium588.jpg?w=584″ class=”size-full wp-image-94257″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/monodelphis-kunsi-acristatherium588.jpg” alt=”Figure 3. Extant Monodelphis kunsi compared to scale with Early Cretaceous Acristatherium. ” width=”584″ height=”580″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/monodelphis-kunsi-acristatherium588.jpg?w=584&h=580 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/monodelphis-kunsi-acristatherium588.jpg?w=150&h=150 150w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/monodelphis-kunsi-acristatherium588.jpg?w=300&h=298 300w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/monodelphis-kunsi-acristatherium588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 3. Extant Monodelphis kunsi compared to scale with Early Cretaceous Acristatherium. These are two of the most primitive marsupials in the LRT.
Figure 4. Giant Andrewsarchus and current relatives in the LRT including Periptychius and Tetraclaenodon. All three are didelphids derived from the Virginia opossum, Didelphis.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/andrewsarchus_relatives588.jpg?w=199″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/andrewsarchus_relatives588.jpg?w=584″ class=”size-full wp-image-94260″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/andrewsarchus_relatives588.jpg” alt=”Figure 4. Giant Andrewsarchus and current relatives in the LRT including Periptychius and Tetraclaenodon. All three are didelphids derived from the Virginia opossum, Didelphis. ” width=”584″ height=”879″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/andrewsarchus_relatives588.jpg?w=584&h=879 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/andrewsarchus_relatives588.jpg?w=100&h=150 100w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/andrewsarchus_relatives588.jpg?w=199&h=300 199w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/andrewsarchus_relatives588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 4. Giant Andrewsarchus and current relatives in the LRT including Periptychius and Tetraclaenodon. All three are didelphids derived from the Virginia opossum, Didelphis.
Figure 5. Extant Monodelphis sorex, Early Cretaceous Cokotherium and Miocene Barinya. Early Cretaceous Eomaia is a more primitive relative in the LRT.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/barinya_monodelphis.sorex_skull588.jpg?w=292″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/barinya_monodelphis.sorex_skull588.jpg?w=584″ class=”size-full wp-image-94262″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/barinya_monodelphis.sorex_skull588.jpg” alt=”Figure 5. Extant Monodelphis sorex, Early Cretaceous Cokotherium and Miocene Barinya. Early Cretaceous Eomaia is a more primitive relative in the LRT. ” width=”584″ height=”601″ srcset=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/barinya_monodelphis.sorex_skull588.jpg?w=584&h=601 584w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/barinya_monodelphis.sorex_skull588.jpg?w=146&h=150 146w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/barinya_monodelphis.sorex_skull588.jpg?w=292&h=300 292w, https://pterosaurheresies.wordpress.com/wp-content/uploads/2025/08/barinya_monodelphis.sorex_skull588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />
Figure 5. Extant Monodelphis sorex, Early Cretaceous Cokotherium and Miocene Barinya. Early Cretaceous Eomaia is a more primitive relative in the LRT. Note the hang down premaxilla.
Source: https://pterosaurheresies.wordpress.com/2025/08/24/several-revisions-part-5/
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