''Misikella'' is an extinct genus of
conodonts.
Two species were named as type species for the genus in separate publications by the same authors in the same year (1974). The first paper named ''Misikella longidentata'', while the second named ''Misikella posthernsteini''. Most species assigned to ''Misikella'' have a Norian-Rhaetian distribution and a bimembrate conodont apparatus, including ''M. posthernsteini''. On the other hand, ''M. longidentata'' has a
Carnian
The Carnian (less commonly, Karnian) is the lowermost stage (stratigraphy), stage of the Upper Triassic series (stratigraphy), Series (or earliest age (geology), age of the Late Triassic Epoch (reference date), Epoch). It lasted from 237 to 227 m ...
-Norian distribution and a tetramembrate apparatus. Fåhræus & Ryley (1989) retained the name ''Misikella'' for only ''M. longidentata'', placing the rest of the species into the new genus ''Axiothea''.
However, other conodont specialists utilize the name ''Misikella'' primarily in the context of ''M. posthernsteini'' and other bimembrate species, rather than ''M. longidentata''.
Use in stratigraphy
The top of the
Norian (the base of the
Rhaetian
The Rhaetian is the latest age of the Triassic Period (in geochronology) or the uppermost stage of the Triassic System (in chronostratigraphy). It was preceded by the Norian and succeeded by the Hettangian (the lowermost stage or earliest age ...
, stages of the Upper Triassic) is close to the first appearance of several species of ''Misikella,'' as well as ''
Epigondolella mosheri''. In 2010, the Norian-Rhaetian boundary was defined by the first appearance of ''Misikella posthernsteini''.
The most often-discussed Rhaetian
GSSP Candidate sections are in
Steinbergkogel in Austria,
or
Pignola-Abriola in Italy.
References
* Conodonts of the genus Misikella Kozur and Mock, 1974 from the Rhaetian of the Tatra Mts (West Carpathians). A Gazdzicki, Acta Palaeontologica Polonica, 1978
External links
*
*
Conodont genera
Triassic conodonts
Norian first appearances
Rhaetian extinctions
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