Identification
Permissions for Use
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Caption
Smaragdinella calyculata, South Pacific. In the Anaspidea there is a tendency for parapodia to enlarge, and together with the mantle, to enclose the fragile shell (with increasingly reduced and involute spire). There is also a tendency for the mantle cavity to be reduced in size and pushed to the right, and for the visceropallium (visceral mass and mantle) to be dominated by the head-foot.
Dr. John B. Burch, Ph.D. 
(photographer, copyright holder), Mollusk Division, Museum of Zoology, University of Michigan
