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Xiphactinus and its ancestors in the LRT

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Short one today
told in pictures.

Here are the taxa
(Fig. 1) in the large reptile tree (LRT, 1803+ taxa; subset Fig. 2) in the lineage of Xiphactinus (Fig. 1) a large Late Cretaceous predator from the Niobrara formation, starting with Calamopleurus, the Early Cretaceous bowfin with long, wicked teeth. Calamopleurus likely had a Late Silurian ancestry based on an Early Devonian relative, Doliodus.

Figure 1. Taxa in the lineage of Xiphactinus going back to Salmo, the salmon. ” data-medium-file=”https://pterosaurheresies.files.wordpress.com/2021/02/xiphactinus-salmon-evo588.jpg?w=166″ data-large-file=”https://pterosaurheresies.files.wordpress.com/2021/02/xiphactinus-salmon-evo588.jpg?w=568″ class=”size-full wp-image-53336″ src=”https://pterosaurheresies.files.wordpress.com/2021/02/xiphactinus-salmon-evo588.jpg?w=584&h=1053″ alt=”Figure 1. Taxa in the lineage of Xiphactinus going back to Salmo, the salmon. ” width=”584″ height=”1053″ srcset=”https://pterosaurheresies.files.wordpress.com/2021/02/xiphactinus-salmon-evo588.jpg?w=584&h=1053 584w, https://pterosaurheresies.files.wordpress.com/2021/02/xiphactinus-salmon-evo588.jpg?w=83&h=150 83w, https://pterosaurheresies.files.wordpress.com/2021/02/xiphactinus-salmon-evo588.jpg?w=166&h=300 166w, https://pterosaurheresies.files.wordpress.com/2021/02/xiphactinus-salmon-evo588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />

Figure 1. Taxa in the lineage of Xiphactinus going back to Salmo, the salmon.

As mentioned earlier,
wrestling with data on these 90 or so ray-fin bony fish over the last 2-3 months has been a full-time task. Many, many corrections were made. The present subset of the LRT still needs some polishing, but it is settling into a logical model for evolutionary processes distinct from traditional cladograms that do not recognize the origin of bony fish from hybodontid sharks and Gregorius.

Figure 2. Subset of the LRT focusing on Xiphactinus and its smaller ancestors. ” data-medium-file=”https://pterosaurheresies.files.wordpress.com/2021/02/rayfin_fish-xiphactinus588.jpg?w=121″ data-large-file=”https://pterosaurheresies.files.wordpress.com/2021/02/rayfin_fish-xiphactinus588.jpg?w=412″ class=”size-full wp-image-53337″ src=”https://pterosaurheresies.files.wordpress.com/2021/02/rayfin_fish-xiphactinus588.jpg?w=584&h=1451″ alt=”Figure 2. Subset of the LRT focusing on Xiphactinus and its smaller ancestors. ” width=”584″ height=”1451″ srcset=”https://pterosaurheresies.files.wordpress.com/2021/02/rayfin_fish-xiphactinus588.jpg?w=584&h=1451 584w, https://pterosaurheresies.files.wordpress.com/2021/02/rayfin_fish-xiphactinus588.jpg?w=60&h=150 60w, https://pterosaurheresies.files.wordpress.com/2021/02/rayfin_fish-xiphactinus588.jpg?w=121&h=300 121w, https://pterosaurheresies.files.wordpress.com/2021/02/rayfin_fish-xiphactinus588.jpg 588w” sizes=”(max-width: 584px) 100vw, 584px” />

Figure 2. Subset of the LRT focusing on Xiphactinus and its smaller ancestors.

The white notch 
that includes mormyrids and piranha (Fig. 2) was covered earlier here.




Source: https://pterosaurheresies.wordpress.com/2021/02/24/xiphactinus-and-its-ancestors-in-the-lrt/



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