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M3#558_GSN F1591

Photogrammetric 3D surface model of the postcanines of the Holotype of Etjoia dentitransitus

Data citation: Hendrickx C., Gaetano L. C., Choiniere J. N., Mocke H., Abdala F., 2020. M3#558_GSN F1591. doi: 10.18563/m3.sf.558

Model solid/transparent

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Specimen infos
Collection
Collection : Geological Survey of Namibia, Windhoek, Namibia

Inventory number : GSN F1591


Information
Sex : indet

Age group : Adult

Age (if applicable) : Ladinian-Carnian

Material Type : Skull, cervical vertebrae

Origin : Etjo Mountain, Waterg Plateau Park, Omingonde Basin, Central Northwest Namibia

Taxonomy
Class : Therapsida

Order : Cynodontia

Family : Traversodontidae

Genus : Etjoia

Species :dentitransitus


Description
A small-bodied cynognathian cynodont (~0.5 m) with the following autapomorphies among gomphodonts: (1) divergent first left and right lower incisor and bearing a small number of large apically oriented denticles; (2) four mesiodistally elongated subrectangular lower gomphodont postcanines; (3) third lower gomphodont postcanine with a prominent mesial cingulum disposed along the entire mesial margin of the crown as well as a small labiolingual constriction at mid-length on its basolingual side; (4) four distal upper and lower sectorial teeth in which the main cusp occupies the mesial half of the crown and includes a strongly distally projected apex; (5) fourth upper sectorial postcanine strongly lingually displaced. Etjoia can further be distinguished from all other cynodonts by a unique combination of characters: similar number of gomphodont and sectorial postcanines in the upper and lower jaws; oval upper gomphodont postcanines with a tall and centrally positioned central cusp on the transverse crest in the mesial gomphodont teeth; upper and lower sectorial teeth significantly larger (i.e. mesiodistally longer and apicobasally higher) than the gomphodont postcanines and devoid of labial or lingual platform/cingulum; maxilla lacking a labial shelf.

Related article
3D models related to the publication: A new traversodontid cynodont with a peculiar postcanine dentition from the Middle/Late Triassic of Namibia and dental evolution in basal gomphodonts.
Christophe Hendrickx, Leandro C. Gaetano, Jonah N. Choiniere, Helke Mocke and Fernando Abdala
Keywords: Cynodontia; Gomphodontia; postcanine; teeth; Traversodontidae

doi: 10.18563/journal.m3.123

  Abstract

    The present 3D Dataset contains the 3D models analyzed in Hendrickx, C., Gaetano, L. C., Choiniere, J., Mocke, H. and Abdala, F. in press. A new traversodontid cynodont with a peculiar postcanine dentition from the Middle/Late Triassic of Namibia and dental evolution in basal gomphodonts. Journal of Systematic Palaeontology


  M3 article infos

in press

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