Hildoceras bifrons a.jpg

Hildoceras bifrons Ammonite

SITE LOCATION: Somerset Shire, Great Britain
TIME PERIOD: Lower Jurassic (170 Million Years Ago)
Hildoceras is a genus of ammonite from the Jurassic era in the family Hildoceratidae. The shells are characterized by a narrow discoidal evolute shape, keeled venter, concave ribs along the outer flanks, and a shallow spiral goove running along smooth inner flanks. Whorls slightly overlap, cross sections are compressed. The ventral keel is bordered on either side by a shallow groove. The genus was named by Alpheus Hyatt after Saint Hilda in 1876. Hildoceras bifrons is an extinct species of ammonite in the family Hildoceratidae. It dates from about 175 million years ago in the Early Jurassic when it was both widespread and common. Fossils have been found in North Africa and Europe, including several regions of England.
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: †Ammonitida
Family: †Hildoceratidae
Genus: †Hildoceras
Species: †bifrons