Protosphyraena nitida - "Prehistoric Swordfish". 85 m.y.o. This exotic Cretaceous predator has been known for over 150 years. It was first discovered in Europe and described in 1857. Charles H. Sternberg discovered the first North American remains in the late 1880's (see comments from his book, shown below). This is the first skeletal presentation of this cartilaginous bodied fish. This and more rare fossils for sale on CuratorsEye.com
The blue lobster is 1 in 2 million. Recently one was caught off the coast of Maine. The fellow's daughter named it Skylar :) and is donating the rare crustacean to the Maine Aquarium that already has 3 other blue lobsters and an orange one.
Cozumel splendid toadfish (yes, splendid is a noun here, not an adjective) - a very rare fish found only in Cozumel island of Mexico. It is the most colorful toadfish of the world.