''Clarkina'' is an extinct genus of
conodonts
Conodonts, are an extinct group of marine jawless vertebrates belonging to the Class (biology), class Conodonta (from Ancient Greek κῶνος (''kōnos''), meaning "cone", and ὀδούς (''odoús''), meaning "tooth"). They are primarily known ...
. It is considered to be an offshore, outer shelf or basinal, deep-water taxon.
[
The genus name is a tribute to David Leigh Clark.
]
Synonyms
''Clarkina'' Soodan 1975 is a junior synonym for the prehistoric sea cucumber '' Soodanella'' Huddleston 1982 in the family Priscopedatidae.
''Clarkina'' Jordan & Evermann, 1927 is a junior synonym for the cyprinid fish genus ''Mylocheilus
The peamouth (''Mylocheilus caurinus''), also known as the peamouth chub, redmouth sucker or northwestern dace, is a species of freshwater ray-finned fish from the Family (biology), family Leuciscidae, the shiners, daces and minnows. This species ...
'' Agassiz, 1855.
Use in stratigraphy
The top of the Capitanian
In the geologic timescale, the Capitanian is an age or stage of the Permian. It is also the uppermost or latest of three subdivisions of the Guadalupian Epoch or Series. The Capitanian lasted between and million years ago. It was preceded by t ...
(or the base of the Wuchiapingian
In the geologic timescale, the Wuchiapingian or Wujiapingian (from in the Liangshan area of Hanzhong, Shaanxi Province ) is an age or stage of the Permian. It is also the lower or earlier of two subdivisions of the Lopingian Epoch or S ...
) is defined as the place in the stratigraphic record where the conodont subspecies ''Clarkina postbitteri postbitteri'' first appears.
The top of the Wuchiapingian
In the geologic timescale, the Wuchiapingian or Wujiapingian (from in the Liangshan area of Hanzhong, Shaanxi Province ) is an age or stage of the Permian. It is also the lower or earlier of two subdivisions of the Lopingian Epoch or S ...
(or the base of the Changhsingian
In the geologic time scale, the Changhsingian or Changxingian is the latest age or uppermost stage of the Permian. It is also the upper or latest of two subdivisions of the Lopingian Epoch or Series. The Changhsingian lasted from to 251.9 Ma a ...
) is defined as the place in the stratigraphic record where the conodont species ''Clarkina wangi'' first appears. The global reference section is profile D at Meishan natively
Meishan ( zh, s=眉山; Sichuanese Pinyin: Mi2san1; local pronunciation: ; zh, p=Méishān , w=Mei-shan), formerly known as Meizhou () or Qingzhou (), is a prefecture-level city with 2,955,219 inhabitants as of 2020 census of whom ...
, in the type area in Changxing.
References
External links
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Ozarkodinida genera
Permian conodonts
{{conodont-stub