Sweetognathus

Sweetognathus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: †Conodonta
Order: †Ozarkodinida
Family: †Sweetognathidae
Genus: †Sweetognathus
Clark, 1972[1]
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]

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