Arctodictis enters the LRT without controversy close to Borhyaena
It had a skull like that of a big cat,
but Arctodictis (Fig 1) was not a big cat. It was a traditional member of Sparassodonta and Borhyaenidae, both within the carnivorous clade of creodonts within the Marsupialia in the LRT.
Figure 1. Skeleton diagram of early Miocene Arctodictis from Forasiepi 2009.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/08/arctodictis.skeleton588.jpg?w=300″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/08/arctodictis.skeleton588.jpg?w=584″ tabindex=”0″ role=”button” class=”size-full wp-image-88478″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/08/arctodictis.skeleton588.jpg” alt=”Figure 1. Skeleton diagram of early Miocene Arctodictis from Forasiepi 2009.” width=”584″ height=”347″ />
Figure 1. Skeleton diagram of early Miocene Arctodictis from Forasiepi 2009.
From the Forasieppi 2009 174 p monograph abstract:
“The anatomy of Arctodictis sinclairi (Sprassodonta, Borhyaenidae) is studied in detail in this work.”
Figure 2. Arctodictis and Borhyaena skulls compared to scale.
” data-medium-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/08/arctodictis.borhyaena.diagram588.jpg?w=240″ data-large-file=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/08/arctodictis.borhyaena.diagram588.jpg?w=584″ tabindex=”0″ role=”button” class=”size-full wp-image-88481″ src=”https://pterosaurheresies.wordpress.com/wp-content/uploads/2024/08/arctodictis.borhyaena.diagram588.jpg” alt=”Figure 2. Arctodictis and Borhyaena skulls compared to scale. ” width=”584″ height=”729″ />
Figure 2. Arctodictis and Borhyaena skulls compared to scale. The parietal and postparietal are fused.
According to Wikipedia
“Borhyaenidae is an extinct metatherian family of low-slung, heavily built predatory mammals in the order Sparassodonta. Borhyaenids are not true marsupials, but members of a sister taxon, Sparassodonta. Like most metatherians, borhyaenids and other sparassodonts are thought to have had a pouch to carry their offspring around.”
In the LRT Early Cretaceous Vincelestes is a small basal member arising from Didelphis, the Virginia opossum and Chironectes, the water opossum. Derived members of this clade include recently extinct Thylacinus, the Tasmanian wolf, and related extant carnivorous small marsupial taxa.
References
Forasiepi AM 2009. Osteology of Arctodictis sinclairi (Mammalia, Metatheria, Sparassodonta) and phylogenyof Cenozoic metatherian carnivores from South America. Monogr. Mus. Argentino Cienc. Natl, n.s. 6:1–174.
wiki/Arctodictis – not yet posted
wiki/Borhyaenidae
wiki/Sparassodonta
Source: https://pterosaurheresies.wordpress.com/2024/08/31/arctodictis-enters-the-lrt-without-controversy-close-to-borhyaena/
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