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Cambarus bartoni
Size: to 3"
Habitat: small streams, sometimes ponds and lakes
Notes: Active at night, hides in burrows or under objects during the day.
Compare freshwater crayfish with marine lobsters.
Blue coloration is the crayfish equivalent of albinism, and also occurs in lobsters. Individuals like this have little chance of surviving in the wild.
There are many types of worms, but most species are either too small or too secretive to be found by casual scuba divers. Nudibranchs are shell-less snails that resemble worms, while Teredos are nearly shell-less bivalves that also resemble worms.