Doswellia: Taxon Exclusion Problems in Sues et al. 2013

Doswellia in several views

Figure 1. Doswellia in several views from Weems (1980).

Sues et al. (2013) took a long, hard look at Doswellia, but still missed the boat due to taxon exclusion. In the large reptile tree Dosweliia nests as a basal choristodere, but no choristoderes were tested in Sues et al. (2013). Moreover, choristoderes are derived from Youngina and Younginoides in the large reptile tree, but none of these taxa were included in the Sues et al. (2013) study. Finally no phylogenetic study looked at by Sues et al. (2013) recognized the divergence of Parachosauriformes (including Doswellia and kin) and Euarchosauriformes. These are basic problems.

Figure 2. Basal Pararchosauriformes includingin Youngina, Doswellia, Cteniogenys and Gualosuchus.

Figure 2. Basal Pararchosauriformes includingin Youngina, Doswellia, Cteniogenys and Gualosuchus.

It’s hard to figure out what Doswellia is when the closest known sisters (Fig. 2) are ignored.

Earlier we talked about Doswellia relationships here. and here.

References
Sues H-D, Desojo JB and Ezcurra MD 2013. Doswelliidae: a clade of unusual armoured archosauriforms form the Middle and Late Triassic. Geological Society, London,

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