Sweetognathus

Sweetognathus is an extinct genus of conodonts in the family Sweetognathidae.

Sweetognathus
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
†Conodonta
(unranked):
†Prioniodontida
Order:
†Ozarkodinida
Family:
†Sweetognathidae
Genus:
†Sweetognathus

Clark, 1972[1]
Species
  • †Sweetognathus asymmetrica
  • †Sweetognathus expansus
  • †Sweetognathus merrelli
  • †Sweetognathus subsymmetricus
  • †Sweetognathus whitei

The genus is characterized by pustulose ornamentation on a wide, flat-topped carina. It originated in the earliest Permian as S. expansus from Diplognathodus edentulus.[2]

Sweetognathus forms a species complex.[3]

The genus is named after paleontologist Walter C. Sweet.

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.[4]

References
  1. Early Permian crisis and its bearing on Permo-Triassic conodont taxonomy. DL Clark, Geologica et Palaeontologica, 1972
  2. 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
  3. The Sweetognathus complex in the Permian of China: implications for evolution and homeomorphy. W Cheng-Yuan, SM Ritter… - Journal of Paleontology, 1987
  4. 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


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