Aulacostephanidae is an extinct ammonoid cephalopod family 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, from the Oxfordian to

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.

Genera

Genera within this family include:Paleobiology Database
/ref>Sepkoski Online
/ref> *''

Aulacostephanus ''Aulacostephanus'' is an extinct Ammonoidea, ammonoid cephalopod genus from the Upper Jurassic Tithonian belonging to the Perisphinctoidea, perisphinctoidean family Aulacostephanidae. ''Aulacostephanus'' produced a discoidal, strongly ribbed, e ...

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Pictonia ''Pictonia'' is an extinct ammonoid cephalopod genus belonging to the family Aulacostephanidae. These fast-moving nektonic carnivores lived during the Jurassic period, Kimmeridgian age (from 152.1 to 157.3 mya).Rasenia ''Rasenia'' is an extinct ammonoid cephalopod genus belonging to the superfamily Perisphinctoidea. These fast-moving nektonic carnivores lived during the Upper Jurassic period, in the Kimmeridgian and Tithonian ages. Etymology This genus gets it ...

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Ringsteadia ''Ringsteadia'' is a 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 ...

References

* JOHN K. WRIGHT
The Aulacostephanidae (Ammonoidea) of the Oxfordian/Kimmeridgian boundary beds (Upper Jurassic) of southern England

Ammonitida families Perisphinctoidea Jurassic ammonites Ammonites of Europe Kimmeridgian first appearances Late Jurassic extinctions {{ammonitina-stub