''Haploceras'' is a genus of late Upper Jurassic (

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 Oxfordian ...

and

Tithonian In the geological timescale, the Tithonian is the latest age of the Late Jurassic Epoch and the uppermost stage of the Upper Jurassic Series. It spans the time between 152.1 ± 4 Ma and 145.0 ± 4 Ma (million years ago). It is preceded by the K ...

) ammonoid cephalopods and the type for the Haploceratidae, similar to '' Lissoceras'' but with a broader whorl section and small blunt lappets and a blunt rostrum; some species with feeble ventral folds on body chamber.

Distribution

Jurassic deposites in North America, Africa, Europe and the mid east.

References

* Arkell ''et al.'', 1957 Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L. Geol Society of America and Univ Kansas Press R.C Moore (ed) Ammonitida genera Haploceratoidea Jurassic ammonites Ammonites of Europe Kimmeridgian life Tithonian life {{Ammonitina-stub