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Qikiqtania: another basal tetrapodomorph from way up North

Monday, December 12, 2022 13:09

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Stewart et al. 2022 described a 375 million-year-old tetrapodomorph
(with fin rays and metacarpals, not fingers), Qikiqtania wakei (Figs 1, 2).

Figure 3. Cladogram and taxon list from Stewart et al 2022. Compare to the LRT taxon list in figure 4. Yellow box taxa are repeated. Grayed taxa are partly or poorly known.

Adding late-surviving basalmost tetrapod taxa
would have improved the Stewart et al study, which unfortunately still supports the invalidated traditional hypothesis (Fig 3) that Acanthostega and Ichthyostega were basalmost tetrapods. Adding taxa (Fig 4) moves these two away from that last common ancestor node (Fig 4).

Figure 4. Subset of the LRT focusing on basal tetrapods at the fin-to-finger transition. Yellow box taxa are repeated in Stewart et al 2022.

References
Stewart TA et al (4 co-authors) 2022. A new elpistostegalian from the Late Devonian of the Canadian Arctic. Nature 608: 563-568.

wiki/Qikiqtania

Publicity
theconversation.com/meet-qikiqtania-a-fossil-fish-with-the-good-sense-to-stay-in-the-water-while-others-ventured-onto-land-186116

uchicago.edu/story/new-fossil-four-legged-fishapod-qikiqtania-wakei-returned-water-tiktaalik-land

Source: https://pterosaurheresies.wordpress.com/2022/12/13/qikiqtania-another-basal-tetrapodomorph-from-way-up-north/

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