Tropidostoma

Tropidostoma
Temporal range: Late Permian, Lopingian
~260–258 Ma
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Tropidostoma dubium (SAM-PK-K11238) in (A) dorsal, (D) ventral, (G) right lateral, and (J) anterior views. Bulbasaurus phylloxyron (CGP/1/938) in (B) dorsal, (E) ventral, (H) right lateral, and (K) anterior views. Specimen has suffered some lateral compression. Scale bars equal 5 cm.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Clade: Therapsida
Suborder: †Anomodontia
Clade: †Dicynodontia
Family: †Oudenodontidae
Genus: †Tropidostoma
Owen, 1876
Species:
†T. dubium
Binomial name
†Tropidostoma dubium
Seeley, 1876
Synonyms
  • Cteniosaurus platyceps
  • Dicynodon acutirostris
  • Dicynodon cavifrons
  • Dicynodon dunnii
  • Dicynodon rogersi
  • Dicynodon validus
  • Tropidostoma microtrema

Tropidostoma is a medium-sized herbivorous oudenodontid dicynodont therapsid that lived during the Late Permian (Lopingian) period in South Africa. The first Tropidostoma fossil was described by Harry Govier Seeley in 1889. Later two subspecies were identified. Tropidostoma fossils are an index fossil in a biozone of the Karoo Basin known as the Tropidostoma Assemblage Zone. This biozone is characterized by the presence of this species in association with another dicynodont species, Endothiodon uniseries.[1][2]

  1. ^ Smith, R.M.H.; Keyser, A.W. "Biostratigraphy of the Tropidostoma Assemblage Zone". In Rubidge, B.S. (ed.). Biostratigraphy of the Beaufort Group (Karoo Supergroup). South African Committee for Stratigraphy Biostratigraphic Series. Vol. 1. Pretoria: Council for Geoscience. pp. 18–22.
  2. ^ Day, M.O.; Smith, R.M.H. (2020). "Biostatigraphy of the Endothiodon Assemblage Zone (Beaufort Group, Karoo Supergroup), South Africa". South African Journal of Geology. 123 (2): 165–180. doi:10.25131/sajg.123.0011.