Haya 2021: still suffering from taxon exclusion

Barta and Norell 2021 give us a detailed look at every bone in the basal ornithischian, Haya griva (Fig. 1). We looked at Haya earlier here and nested it close to Pisanosaurus in the large reptile tree (LRT, 1810+ taxa). … Continue reading

New turtle clades: destined for revision due to taxon exclusion

Joyce et al. 2021 report, “Over the last 25 years, researchers, mostly paleontologists, have developed a system of rank-free, phylogenetically defined names for the primary clades of turtles. As these names are not considered established by the PhyloCode, the newly created nomenclatural … Continue reading

Traditional batoids (skates + rays): taxon exclusion hampers prior phylogenetic results

McEachran and Aschliman 2004 reported,“all authors agree that batoids constitute a monophyletic group.” Underwood et al. 2015 reported, “While the monophyly of the Batoidea is not in doubt, phylogenetic relationships within the group are uncertain.” By including a wider gamut of taxa,the large … Continue reading

Taxon exclusion mars 2020 study of evolutionary innovation in reptiles

Simões et al. 2020 present their vision of phenotypic diversity in reptiles (Fig. 1). Unfortunately they do so without knowing the last common ancestor of reptiles (Silvanerpeton) and the basal dichotomy of reptiles, both of which lead to a complete … Continue reading

Chimento and Agnolin 2020: Litopterna interrelations suffers from taxon exclusion

Chimento and Agnolin 2020 discuss interrelationships within and outside the clade Litopterna, famous for including Macrauchenia (Fig. 1), the odd South American ungulate. Strangely the chalicotheres were excluded. In the large reptile tree (LRT, 1721+ taxa, subset Fig. 2), litopterns … Continue reading

Simões et al. 2020 fail to understand ‘diapsids’ due to taxon exclusion

Simões et al. 2020 brings us their study on the rates of evolutionary change in reptiles with a diapsid skull architecture. From the abstract: “The origin of phenotypic diversity among higher clades is one of the most fundamental topics in … Continue reading