University of Vermont

Virtual Field Study


Astarte and Anadara:

     Preliminary identification of mollusk genera is performed in the field by referencing collected shells against field book sketches and photographs.   The ability to identify a fossil is one of the most important aspects of an evolutionary study, because the study of evolution hinges on a scientist's ability to track subtle changes in a particular species over time.   Astarte and Anadara shells were identified via the following characteristics:

    Astarte:  The genus Astarte is characterized by a pointed umbo, and well defined adductor scars and pallial lines.  Like all mollusks Astarte has annual growth lines, however the shells lack ribbing, and are always longer then they are high. (click to enlarge)

Astarte Down Astate Up Shell  Morphology

    Anadara: The genus Anadara is characterized by a rounded and partially overturned umbo, and poorly defined adductor scars and pallial lines.  Anadara specimens have growth rings and shell ribbing, with shells that are as high as they are long, giving them a boxy appearance. (click to enlarge)

Anadara Down Anadara Up Shell Morphology

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Last modified October 06 2008 02:38 PM

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