''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) ammonites, commonly with evolute shells with strong ribbing that typically divides about mid flank before crossing the ven ...

. These fast-moving nektonic carnivores lived during the Upper

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

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 157.3 ± 1.0 Ma and 152.1 ± 0.9 Ma (million years ago). The Kimmeridgian follows the Oxford ...

and Tithonian ages.

Etymology

This genus gets its name from

Market Rasen Market Rasen ( ) is a town and civil parish within the West Lindsey district of Lincolnshire, England. The River Rase runs through it east to west, approximately north-east from Lincoln, east from Gainsborough, 14 miles (23 km) west of Lo ...

in Lincolnshire (Midland England), place where it is frequently found.

Distribution

Fossils of species within this genus have been found in the

sediments of Russia, France and United Kingdom.

References

External links

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