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TF0104 - Exogyra Virgula
Age
Jurassic
Species
virgula
Stratigraphic Range
Jurassic
Taxonomy
Phylum: Mollusca
Class: Bivalvia
Order: Ostreoida
Family: Gryphaeidae
Class: Bivalvia
Order: Ostreoida
Family: Gryphaeidae
Distinctive Features
Growth lines
Ribs
Umbo
Two valves
Ribs
Umbo
Two valves
Preservation
Mineral replacement of shell
Advanced notes
A feature characteristic of the Gryphaeidae is two asymmetric valves. The upper valve (the right valve in development) is flat, whilst the lower (left) valve is curved.