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Nice crocea!
Crocea is the only smooth one?
Hmm.. guess it's time to do some clam homework..
Thanks!
Sent Via the R2R Forum APP
Here I stole this but it'll get you where you'd like to go... and the link I stole from which provides tons o nfo...
Observable features of the shell which may serve as identification aids:
—the nature of the shell's overall shape and symmetry
—the nature of the shell's ribs or folds, which are the undulations that give the shell a corrugated appearance
—the nature of or lack of scutes, which are shelf or scale-like structures on the shell
—the nature of the shell's upper margin which gives the two valves an interlocking appearance
—the nature of, or lack of, the shell's byssal opening, which is an opening at the bottom of the shell where numerous tough fibers (collectively called a byssus) can be secreted to attach the clam firmly to the substrate
Observable features of the mantle which may also serve as identification aids:
—the degree of, or lack of, extension of the mantle beyond the top margin of the shell
—the type of, or lack of, tentacles/projections around the edge of the incurrent siphon/aperture, which is the centrally-located opening in the mantle where water is brought into the body cavity.
http://reefkeeping.com/issues/2002-07/jf/feature/index.php
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