An aberrant stem tetrapod from the early Permian of Brazil

Early evolutionary history of tetrapods is typically divided into two major phases: an initial diversification of archaic stem tetrapod groups, and a sudden replacement by temnospondyl amphibians and amniotes following a late Carboniferous dry interval termed the Carboniferous Rainforest Collapse (CRC). However, the degree to which this scenario applies to the early tetrapods of Gondwana is uncertain. Here we report Tanyka amnicola, gen. et sp. nov., an archaic stem tetrapod from the early Permian of Brazil characterized by strong torsion of the mandibular ramus and a remarkable battery of enlarged denticles on a strongly arched coronoid. The new taxon is assigned to the tetrapod stem based on the presence of a denticulate adsymphyseal and elevated hook-like glenoid surface without a postglenoid area. Phylogenetic analysis shows affinities between this species and stem tetrapods more proximal to the tetrapod crown group, particularly Eucritta and the Laurussian baphetids. This is the se..., , # An aberrant stem tetrapod from the early Permian of Brazil

Dataset DOI: [10.5061/dryad.gtht76j1g](https://doi.org/10.5061/dryad.gtht76j1g)

## Description of the data and file structure

Surface scan in OBJ format prepared using a Creaform 3D white-light surface scanner.
### Files and variables

#### File: MAP_PV662_Tanika_jaw.obj

**Description:** Surface scan of the holotype jaw of *Tanyka amnicola*, MAP PV 662
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