“Gnathodus”的意思、由来-开放百科全书

词条

Gnathodus

释义

Use in stratigraphy
References
External links

{{Italic title}}{{taxobox
| fossil_range = {{fossil_range|Early Carboniferous}}
| image = Conodonts.jpg
| image caption = Conodont elements from the Deer Valley Member of the Mauch Chunk Formation
{{hidden|detail|Figures 3–9. Conodonts from the uppermost Loyalhanna Limestone Member of the Mauch Chunk Formation, Keystone quarry, Pa. This collection (93RS–79b) is from the upper 10 cm of the Loyalhanna Member. Note the highly abraded and reworked aeolian forms. 9. Gnathodus texanus?, Pa element, upper view, X140.
Figures 10–14. Conodonts from the basal 20 cm of the Loyalhanna Limestone Member of the Mauch Chunk Formation, Keystone quarry, Pa. (93RS–79a), and Westernport, Md. (93RS–67). Note the highly abraded and reworked aeolian forms. 12. Gnathodus sp., Pa element, upper view, reworked Late Devonian(?) through Mississippian morphotype, 93RS–67, X140.}}
| regnum = Animalia
| phylum = Chordata
| classis = †Conodonta
| ordo = †Ozarkodinida
| familia = †Idiognathodontidae
| genus = †Gnathodus
| genus_authority = Pander, 1856^[1]
| subdivision_ranks = Species
| subdivision =

†Gnathodus bilineatus
†Gnathodus bollandensis
†Gnathodus postbilineatus
†Gnathodus pseudosemiglaber
†Gnathodus semiglaber
†Gnathodus texanus
†Gnathodus typicus

| synonyms =
}}

Gnathodus is an extinct conodont genus in the family Idiognathodontidae.

Use in stratigraphy

The Tournaisian, the oldest age of the Mississippian (also known as Lower Carboniferous), contains eight conodont biozones, 3 of which are defined by Gnathodus species:

the zone of Gnathodus pseudosemiglaber and Scaliognathus anchoralis
the zone of Gnathodus semiglaber and Polygnathus communis
the zone of Gnathodus typicus and Siphonodella isosticha

The Visean, the second age of the Mississippian, contains four conodont biozones, two of which are defined by Gnathodus species:

the Gnathodus bilineatus Zone
the Gnathodus texanus Zone

The Serpukhovian, the third or youngest age of the Mississippian, includes four conodont biozones, two of which are defined by Gnathodus species:

the Gnathodus postbilineatus Zone
the Gnathodus bollandensis Zone

References

1. ^Monographie der fossilen fische des silurischen systems des Russisch-baltischen gouvernements. CH Pander, 1856

Proposal of Gnathodus bilineatus (Roundy, 1926) as type species of the genus Gnathodus Pander, 1856 (Conodonts). HR Lane and W Ziegler, Senckenbergiana lethaea, 1984

External links

Gnathodus at fossilworks.org (retrieved 15 May 2016){{Taxonbar|from=Q25096339}}{{Conodont-stub}}

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