Sweetognathus forms a species complex.
The genus is named after paleontologist Walter C. Sweet.
It has been found that recurrent parallel species pairs have occurred throughout Sweetognathus evolution between populations originating in Bolivia, the Mid-Western Unitied States, and Russia. Parallelisms have been found to occur in the denticle morphologies of their platform elements.
Use in stratigraphy
According to the List of Global Boundary Stratotype Sections and Points, the species Sweetognathus whitei made its first appearance during the Artinskian (some 290.1 ± 0.26 mya), in the Permian of the Ural mountains.
The species Sweetognathus merrelli is near first appearance during the Sakmarian (some 295.0 ± 0.18 mya) in the Permian of Kondurovsky, Orenburg, Russia.
- Early Permian crisis and its bearing on Permo-Triassic conodont taxonomy. DL Clark, Geologica et Palaeontologica, 1972
- Petryshen, W.; Henderson, C. M.; De Baets, K.; Jarochowska, E. (2020-11-25). "Evidence of parallel evolution in the dental elements of Sweetognathus conodonts". Proceedings of the Royal Society B: Biological Sciences. 287 (1939): 20201922. doi:10.1098/rspb.2020.1922.
- Evolution and distribution of the conodonts Sweetognathus and Iranognathus and related genera during the Permian, and their implications for climate change. S Mei, CM Henderson, BR Wardlaw - Palaeogeography, Palaeoclimatology, 2002
- The Sweetognathus complex in the Permian of China: implications for evolution and homeomorphy. W Cheng-Yuan, SM Ritter… - Journal of Paleontology, 1987
- Proposal for the base of the Sakmarian Stage: GSSP in the Kondurovsky Section, southern Urals, Russia. BI Chuvashov, VV Chernykh, EY Leven, VI Davydov, Permophiles, 2002