''Sweetognathus'' is an extinct genus of
conodonts in the family
Sweetognathidae
Sweetognathidae is an extinct family of conodonts in the order Ozarkodinida
Ozarkodinida is an extinct conodont order. It is part of the clade Prioniodontida, also known as the "complex conodonts".
Name
Ozarkodinida is named after the Ozark ...
that evolved at the beginning of the Permian period (298.9 Ma), in near-equatorial, shallow-water seas.
The genus is characterized by pustulose ornamentation on a wide, flat-topped
carina
Carina may refer to:
Places
Australia
* Carina, Queensland, a suburb in Brisbane
* Carina Heights, Queensland, a suburb in Brisbane
* Carina, Victoria, a locality in Mildura
Serbia
* Carina, Osečina, a village in the Kolubara District
...
. It originated in the earliest
Permian
The Permian ( ) is a geologic period and System (stratigraphy), stratigraphic system which spans 47 million years from the end of the Carboniferous Period million years ago (Mya), to the beginning of the Triassic Period 251.9 Mya. It is the last ...
as ''S. expansus'' from ''
Diplognathodus edentulus''.
''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
This is a list of Global Boundary Stratotype Sections and Points. Since 1977, Global Boundary Stratotype Sections and Points (abbreviated GSSPs) are internationally agreed upon reference points on stratigraphic sections of rock which define the ...
, the species ''Sweetognathus whitei'' made its first appearance during the
Artinskian
In the geologic timescale, the Artinskian is an age or stage of the Permian. It is a subdivision of the Cisuralian Epoch or Series. The Artinskian likely lasted between and million years ago (Ma) according to the most recent revision of th ...
(some 290.1 ± 0.26 mya), in the Permian of the
Ural mountains
The Ural Mountains ( ; rus, Ура́льские го́ры, r=Uralskiye gory, p=ʊˈralʲskʲɪjə ˈɡorɨ; ba, Урал тауҙары) or simply the Urals, are a mountain range that runs approximately from north to south through western ...
.
The species ''Sweetognathus merrelli'' is near first appearance during the
Sakmarian
In the geologic timescale, the Sakmarian is an age or stage of the Permian. It is a subdivision of the Cisuralian Epoch or Series. The Sakmarian lasted between 293.52 and million years ago (Ma). It was preceded by the Asselian and followed by t ...
(some 295.0 ± 0.18 mya) in the Permian of
Kondurovsky,
Orenburg, Russia.
[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]
References
External links
*
Ozarkodinida genera
{{Conodont-stub