X is for X-Ray Fish

W is for Worms

This one was done really fast, because I didn't want to look at the pictures of worms anymore.

V is for Vampire Squid

U is for Urchin

T is for Tiger Shark

Tiger Sharks might be the evilest-non-evil thing I can think of.  The scene in Jaws where Quint is telling his story of the SS Indianapolis still scares me senseless.

S is for Seahorse

R is for Reef Shark