Tirnovella
Extinct subgenus of cephalopods
From Wikipedia, the free encyclopedia
Tirnovella is an extinct subgenus of ammonoid cephalopod, from the early Cretaceous.[2]
| Tirnovella Temporal range: | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | †Ammonoidea |
| Order: | †Ammonitida |
| Family: | †Neocomitidae |
| Subfamily: | †Berriasellinae |
| Subgenus: | †Tirnovella Nikolov, 1966 |
| Type species | |
| †Tirnovella alpillensis Mazenot, 1939 | |
| Species[1] | |
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
Species
- 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
