Sweetognathus
| Sweetognathus | |
|---|---|
| Scientific classification | |
| Kingdom: | |
| Phylum: | Chordata |
| Class: | |
| (unranked): | |
| Order: | |
| Family: | |
| Genus: | †Sweetognathus |
| Species | |
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Sweetognathus is an extinct genus of conodonts in the family Sweetognathidae that evolved at the beginning of the Permian period (298.9 Ma), in near-equatorial, shallow-water seas.[2]
The genus is characterized by pustulose ornamentation on a wide, flat-topped carina. It originated in the earliest
Diplognathodus edentulus.[3]
Sweetognathus forms a species complex.[4]
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.[2] Parallelisms have been found to occur in the denticle morphologies of their platform elements.[2]
Use in stratigraphy
According to 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.[5]
References
- ^ Early Permian crisis and its bearing on Permo-Triassic conodont taxonomy. DL Clark, Geologica et Palaeontologica, 1972
- ^ PMID 33203328.
- ^ 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
External links
- "Sweetognathus". Fossilworks. Gateway to the Paleobiology Database. Retrieved 5 June 2016.
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