AquaNerd
Guest
Here's a clam ID page created by chrisANDbarb who are very knowledgeable about clams and frequent a lot of hobbyist sites.
http://www.3reef.com/forums/reef-aquarium-articles-how-tos/tridacnid-clam-id-made-easy-54343.html
http://www.3reef.com/forums/reef-aquarium-articles-how-tos/tridacnid-clam-id-made-easy-54343.html