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Evolution at the basal dichotomy of bony fish

Monday, February 10, 2020 18:57

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For a large segment of American (USA) citizens
evolution remains unbelievable (pewrsearch.org). Other than a few well-know examples that demonstrate our knowledge of transitional taxa (e.g. human ancestry; Fig. 1) the reason for this might be a general lack of diagrams demonstrating the micro-evolution between major taxa.

Figure 2. Human evolution back to the cynodonts, some 230 mya.

As a remedy, here’s one example
of micro-evolution (Fig. 2) at the base of the origin of bony fish.

Figure 1. A sister to Hybodus gave rise to a basal dichotomy in bony fish. Basal taxa immediately following this split include Trachinocephalus on the clade leading to tetrapods and Amia on the clade leading to most other traditional teleosts.

Shown above
are transitional taxa leading to bony fish. An early Devonian sister to the traditional shark, Hybodus (Early Jurassic), gave rise to a basal dichotomy in bony fish. Taxa immediately following this split include the extant lizardfish, Trachinocephalus, a member of the clade leading to tetrapods and the extant bowfin, Amia, a member of the clade leading to most other traditional teleosts.

FIgure 3. Taxa highlighted in today’s blog are highlighted here in this subset of the LRT.

The large reptile tree (LRT) documents the evolution of all included taxa back to Cambrian lancelets. More transitional taxa can be seen here, here and here with more to come.

Source: https://pterosaurheresies.wordpress.com/2020/02/11/evolution-at-the-basal-dichotomy-of-bony-fish/

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