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Figure 1 | BMC Evolutionary Biology

Figure 1

From: Evolutionary implications of the divergent long bone histologies of Nothosaurus and Pistosaurus(Sauropterygia, Triassic)

Figure 1

Contrasting phylogenetic hypotheses of stem-group Sauropterygia and relationships of Nothosaurus . A, In the analysis of Holmes et al. [6], the putative pachypleurosaur Keichosaurus plots as a basal nothosauroid, and Pachypleurosauria and Nothosauroidea form a monophyletic taxon, resulting in the loss of the node Eusauropterygia; B, The classical view [4] with the Pachypleurosauria as the sister-group of Eusauropterygia including Nothosauroidea and Pistosauroidea; C, Phylogeny of the Nothosauridae [modified from 16] with the sampled species indicated in bold. Nothosaurus winterswijkensis and N. marchicus are more basal species than N. giganteus. N. mirabilis is one of the most derived nothosaur species.

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