''Rasenia'' is an extinct ammonoid cephalopod genus belonging to the superfamily

Perisphinctoidea Perisphinctoidea, formerly Perisphinctaceae, is a superfamily of Middle Jurassic (Bajocian) to Lower Cretaceous (Barremian) Ammonitina, ammonites, commonly with evolute shells with strong ribbing that typically divides about mid flank before cro ...

. These fast-moving nektonic carnivores lived during the Upper

Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. ...

period, in the

Kimmeridgian In the geologic timescale, the Kimmeridgian is an age in the Late Jurassic Epoch and a stage in the Upper Jurassic Series. It spans the time between 154.8 ±0.8 Ma and 149.2 ±0.7 Ma (million years ago). The Kimmeridgian follows the Oxfordian ...

and

Tithonian In the geological timescale, the Tithonian is the latest age (geology), age of the Late Jurassic Epoch and the uppermost stage (stratigraphy), stage of the Upper Jurassic Series. It spans the time between 149.2 ±0.7 annum, Ma and 143.1 ±0.6 (mi ...

ages.

Etymology

This genus gets its name from

Market Rasen Market Rasen ( ) is a market town and civil parishes in England, civil parish within the West Lindsey district of Lincolnshire, England. The River Rase runs through it east to west, approximately north-east from Lincoln, England, Lincoln, eas ...

in Lincolnshire, England, where it is frequently found.

Distribution

Fossils of species within this genus have been found in the

sediments of Russia, France and the United Kingdom.

References

External links

Twmuseum
Ammonitida genera Perisphinctoidea Jurassic ammonites Ammonites of Europe Aulacostephanidae {{ammonitina-stub