Biology:Tirnovella
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Short description: Extinct subgenus of cephalopods
| Tirnovella | |
|---|---|
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Neocomitidae |
| Subfamily: | †Berriasellinae |
| Subgenus: | †Tirnovella Nikolov, 1966 |
| Type species | |
| †Tirnovella alpillensis Mazenot, 1939
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| Species[1] | |
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See text | |
Tirnovella is an extinct subgenus of ammonoid cephalopod, from the early Cretaceous.[2]
Use in Stratigraphy
The group is often used as an index fossil, with Tirnovella alpillensis being used to define border between the Berriasian and the Valanginian stages of the Cretaceous, and Tirnovella subalpina defining the border between the Middle and Lower substages of the Berriasian. The Middle Berriasian is the defined as the Tirnovella occitanica zone. [3][4]
Distribution
Fossils of the genus are relatively common throughout Europe, with fossils from Morocco to Crimea.
Species
- Tirnovella occitancia Tirnovella companyi
- Tirnovella subalpina Tirnovella alpillensis
- Mazenot, 1939 Hegarat, 1964
- Tirnovella allobrogensis Tirnovella petransiens
- (Mazenot, 1939) (Hoedemaeker, 2016)
- Tirnovella berriasensis (G. Sayn, 1901)
- (Hoedemaeker, 2016) Tirnovella bogdanovae
References
- ↑ Zakharov, Viktor A.; Bown, Paul; Rawson, Peter F. (1996). "The Berriasian Stage and the Jurassic-Cretaceous boundary". Royal Belgian Institute of Natural Sciences. https://biblio.naturalsciences.be/rbins-publications/bulletin-of-the-royal-belgian-institute-of-natural-sciences-earth-sciences/66-sup-1996/irscnb_p4087_00da07p_66-sup_bulletin-1-red.pdf.
- ↑ Nikolov, Todor (January 1966). "New genera and subgenera of ammonites of family Berriasellidae". Doklady Bolgarskoi akademii nauk 19 (7): 639-642. https://www.researchgate.net/publication/285716399_New_genera_and_subgenera_of_ammonites_of_family_Berriasellidae. Retrieved 17 November 2022.
- ↑ Tirnovella at fossilworks.org (retrieved 17 November 2022)
- ↑ Galli, Claudio. "Tirnovella". Conchology, Inc.. https://conchology.be/?t=2217&family=NEOCOMITIDAE&p=16.
External links
- Wright C.W. with J.H. Callomon and M.K. Howarth (1996). "Mollusca 4 Revised: Cretaceous Ammonoidea". in Roger L. Kaesler. Treatise on Invertebrate Paleontology Part L. 4. Boulder, Colorado and Lawrence, Kansas: The Geological Society of America & University of Kansas Press. p. 54-55. https://archive.org/details/treatiseoninvert0000join/page/n3/mode/2up?view=theater.
Wikidata ☰ Q23841347 entry
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