Capitosaurus (Rhineceps) and Wantzosaurus

Rhineceps nyasaensis (Haughton) is considered a mastodonsaur. Here it nests with Wantzosaurus between Neldasaurus and Trematosaurus. Overall larger and with a lower, flatter skull, Capitosaurus had a midline suture that was discontinuous between the nasals, frontals and parietals, an intranasal fenestra and horn-like tabulars. Note the curved jawline and deep tabulars.

Capitosaurus polaris (Münster 1836, Wiman 1914; Late Triassic, 235-200 mya)is another name for this specimen.

Wantzosaurus elongatus (Lehman 1961, Steyer 2002; Early Triassic) was considered a trematosaur, close to another narrow-skulled taxon, Trematosaurus. Here it nests with Capitosaurus, close to Trematosaurus.

The rostrum becomes longer and narrower in adults. Or is this a phylogenetic change? The tabular contact the squamosal.

Trematosaurus 2 This specimen nests closer to Wantzosaurus, which nests closer to Rhinceps and is only convergent with the other specimen listed as Trematosaurus.

Lehman 1961. Les Stégocéphales de Madagascar. Annales de Paléontologie, 47, 42–46.

Steyer SJ 2002. The First Articulated Trematosaur 'amphibian' from the Lower Triassic of Madagascar: Implications for the Phylogeny of the Group”. Palaeontoogy, 14(4): 771-793.

Wiman C 1914. Über die Stegocephalen aus der Trias Spitzbergens. Bulletin of the Geological Institutions of the University of Uppsala 13:1-34

wiki/Capitosaurus
wiki/Wantzosaurus

Paratetrapoda

Tetrapoda