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  "description_bbcode_parsed": "<span style='word-wrap: break-word;'>Phylogenetic tree of The Speculative Dinosaur Project&rsquo;s Enantiornithes cladogram.<br /><br />Long time readers will know that I contributed a lot to The Speculative Dinosaur Project&rsquo;s Enantiornithes. Given my recent cladograms (themselves essentially slightly more complex versions of Mortimer 2019&rsquo;s) I decided to map out Spec&rsquo;s opposite bird clades given what we now know.<br /><br /><br />- Overall the original scheme was rather prescient all things considered: a split between a clade composed of Avisauridae (and in some drafts ebergs) and another including most other taxa. In cladograms following Mortimer 2019 this cut in Enantiornithe phylogeny is present; Enantiornis, Gobipteryx and Longipterygidae all form a clade at the exclusion of several other taxa including classic avisaurids (several purported avisaurids like Halimornis and Concornis are basal to this split)<br /><br />- Twiatiaviformes were originally in the Yahoo group described as both closely related to the False Panha and Allospiziformes, and the Cretaceous taxa Alexornis is given as a potential stem-tweetie. However, Alexornis is now recovered as relatively closer to avisaurids, so either tweeties become part f Avisauriformes or are instead connected to their original relatives, perhaps as extant longipterygids with Gobipipus being an early member.<br /><br />- Similarly Enabaptiformes (ebergs) have a rather unstable position: either they&rsquo;re related to Longirostravis (and thus another lineage of surviving longipterygids) or to Yungavolucris (in which case they&rsquo;re avisaurids).<br /><br />- Within avisaurids I did make marine taxa based off Halimornis; it&rsquo;s easy to just say they&rsquo;re simply avisaurids that converged with Halimornis, though they could easily represent yet another surviving opposite-bird clade.</span>",
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