Tirnovella is an extinct subgenus of ammonoid cephalopod, from the early Cretaceous.[2]
| Tirnovella Temporal range:
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|---|---|
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] | |
Use in Stratigraphy edit
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 edit
Fossils of the genus are relatively common throughout Europe, with fossils from Morocco to Crimea.
Species edit
- Tirnovella alpillensis Mazenot, 1939
- Tirnovella berriasensis Hegarat, 1964
- Tirnovella petransiens (G. Sayn, 1901)
- Tirnovella subalpina
- Tirnovella allobrogensis (Mazenot, 1939)
- Tirnovella bogdanovae (Hoedemaeker, 2016)
- Tirnovella companyi (Hoedemaeker, 2016)
- Tirnovella occitancia
References edit
- ^ Zakharov, Viktor A.; Bown, Paul; Rawson, Peter F. (1996). "The Berriasian Stage and the Jurassic-Cretaceous boundary" (PDF). biblio.naturalsciences.be. Royal Belgian Institute of Natural Sciences. Retrieved 17 November 2022.
- ^ Nikolov, Todor (January 1966). "New genera and subgenera of ammonites of family Berriasellidae". Doklady Bolgarskoi akademii nauk. 19 (7): 639–642. Retrieved 17 November 2022.
- ^ "Tirnovella". Fossilworks. Gateway to the Paleobiology Database. Retrieved 17 November 2022.
- ^ Galli, Claudio. "Tirnovella". conchology.be. Conchology, Inc. Retrieved 17 November 2022.
External links edit
- Wright C.W. with J.H. Callomon and M.K. Howarth (1996). "Mollusca 4 Revised: Cretaceous Ammonoidea". In Roger L. Kaesler (ed.). Treatise on Invertebrate Paleontology Part L. Vol. 4. Boulder, Colorado and Lawrence, Kansas: The Geological Society of America & University of Kansas Press. p. 54-55 – via Internet Archive.
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