GLOSSARY OF BIVALVE MORPHOLOGIC TERMS
Illustrations and objective data courtesy of AMOCO Production Co., Alan B. Shaw (Manager, South Florida Carbonate Project), and Brian F. Glenister (AMOCO Consultant)
General shape of the
|equivalve||Right and left valves subequal and comprising mirror images of one another except for hinge structures||
|inequivalve||Opposite valves dissimilar in size or shape or both|
|prosogyral||Beaks directed forward|
Beaks turned backward instead of projecting forward
In this case, you use the fact that the beak is closer to the anterior rather than the fact that the beak points to the posterior of this shell. This is a picture of the left valve, not the right valve.
|taxodont||Characterized by more or less numerous subequal hinge teeth, generally arranged in a row|
|auriculate||Shell possessing auricles; equivalent to alate|
|produced||Shell much elongated in one direction|
|prosocline||Having forward obliquity, approach to beak along mid-line of shell inclined forward|
Last updated on September 3, 2002-eek.