Distribution
Hildoceras bifrons
The Hildoceras bifrons species inhabited a shallow to deep oceanic nekton environment and are typically found in fine marine sediments. They are geographically distributed in:
- England (Dorset, Somerset, Gloucestershire, Oxfordshire, Northamptonshire, Leicestershire, Lincolnshire and Yorkshire)
- Europe
- north Africa
- Caucasus Mountains
Stratigraphically Hildoceras bifrons occurs in the Peronoceras fibulatum and Catacoeloceras crassum subzones of the H. bifrons zone, of the Lower Toarcian rocks.
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Glossary
Nekton is a free-swimming animals
Evolute and involute are geometrical terms relating to the shape of a curve
Lappets are spoon shaped extensions from the margin of the aperture
Arcuate is curved
Striae are fine lines of ornament
Ventro-lateral keels are ridges (keels) located on the sides of the venter
Tricarinate and bisulcate are two grooves separating the has three ridges (keels)of the venter.
Venter is the shell edge around the circumference