Ostraconophobia is the fear of shellfish. there is no specific
word for fear of crabs. crabs, clams, shrimps etc. are all under
the category of shellfish.
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Ostraconophobia.... fear of shellfish
Couldn't find one specifically for crabs.
A.P.
Kabourophobia... Fear of crabs
(see
http://www.urbandictionary.com/define.php?term=kabourophobia)
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Neophobia-----------Fear of new things Myrmecophobia-----Fear of
ants Zoophobia-----------Fear of animals Asymmetriphobia---Fear of
things that are asymmetrical Taphephobia--------Fear of being
buried alive Ostraconophobia---Fear of shellfish
Russophobia---------Fear of Russians Potamophobia-------Fear of
running water Peniaphobia----------Fear of poverty
Aichmophobia--------Fear of poisoned objects