Haploceras
Encyclopedia
Haploceras is a late Upper Jurassic (Kimmeridgian
and Tithonian
) ammonoid cephalopod and 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. Haploceras has been found world wide, in North America, Africa, Europe and the mid east.
Kimmeridgian
In the geologic timescale, the Kimmeridgian is an age or stage in the Late or Upper Jurassic epoch or series. It spans the time between 155.7 ± 4 Ma and 150.8 ± 4 Ma . The Kimmeridgian follows the Oxfordian and precedes the Tithonian....
and Tithonian
Tithonian
In the geologic timescale the Tithonian is the latest age of the Late Jurassic epoch or the uppermost stage of the Upper Jurassic series. It spans the time between 150.8 ± 4 Ma and 145.5 ± 4 Ma...
) ammonoid cephalopod and type for the Haploceratidae, similar to Lissoceras
Lissoceras
Lissoceras is an involute, smooth or finely vetrolaterally ribbed, ammonite with a blunt, un-keeled venter, included in the Haploceratidae, that lived from the Lower Bajocian - Middle Oxfordian in what is now Europe, south Asia, and southern Alaska.Lissoceratoides, once considered to be a subgenus...
but with a broader whorl section and small blunt lappets and a blunt rostrum; some species with feeble ventral folds on body chamber. Haploceras has been found world wide, in North America, Africa, Europe and the mid east.