Extinct genus of jawless fishes
Sweetognathus
|
Scientific classification
|
Kingdom:
|
|
Phylum:
|
|
Class:
|
|
(unranked):
|
|
Order:
|
|
Family:
|
|
Genus:
|
†Sweetognathus
|
Species
|
- †Sweetognathus asymmetrica
- †Sweetognathus expansus
- †Sweetognathus merrelli
- †Sweetognathus subsymmetricus
- †Sweetognathus whitei
|
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 Permian as S. expansus from 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]
- ^ Early Permian crisis and its bearing on Permo-Triassic conodont taxonomy. DL Clark, Geologica et Palaeontologica, 1972
- ^ a b c 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. PMC 7739493. 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