Cochleosaurus joins the LRT

Updated January 30, 2019
with a new nesting for Cochleosaurus.

This examination of Cochleosaurus
was undertaken when this taxon appeared in the cladogram of Arbez, Sidor and Steyer 2018 in their study of the basal tetrapod, Laosuchus. In order to understand their work better, I added all their taxa to the LRT.

igure 1. Cochleosaurus in situ and restored by Rieppel 1980 and Godfrey and Holmes 1995. Here the septomaxilla is reidentified as the lacrimal and the lacrimal is the palatine exposed on the surface as in all sister taxa of its clade.

Figure 1. Cochleosaurus in situ and restored by Rieppel 1980 and Godfrey and Holmes 1995. Here the septomaxilla is reidentified as the lacrimal and the lacrimal is the palatine exposed on the surface as in all sister taxa of its clade.

Cochleosaurus bohemicus (Fritsch 1885; C. forensis Rieppel 1980; Moscovian, Late Carboniferous; 310 mya; 1.2-1.6m) was named for the spoon-like processes at the back of the skull. Traditionally considered a temnospondyl (a clade not recovered by the large reptile tree (1391 taxa), here it nests with Nigerpeton (Fig. 2), Saharastega and Chenoprosopus, taxa that share a high lateral naris, among other traits.

Figure 2. Nigerpeton nests with its contemporary, Saharastega (figure 1) and has dorsal nares and a concave rostrum.

Figure 2. Nigerpeton nests with its contemporary, Saharastega (figure 1) and has dorsal nares and a concave rostrum.

References
Fritsch A. 1885. Fauna der Gaskohle und der Kalksteine der Permformation Bohmens. vol. 2, Prague, 107 pp.
Godfrey SJ and Holmes R 1995. The Pennsylvanian temnospondyl Cochleosaurus florensisRieppel, from the lycopid stump fauna at Florence, Nova Scotia. Breviora 500:1–25.
Rieppel O. 1980. The edopoid amphibian Cochleosaurus from the Middle Pennsylvanian of Nova Scotia. Palaeontology 23(1):143–149.

wiki/Cochleosaurus

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