Barry the Giant Sea Worm

A 4 ft. tropical polychaete worm was recently discovered in a UK aquarium to the shock of aquarium officials. The officials suspected something was amiss when the coral and other tank occupants were attacked. It even ate the bait and hook traps set out for another injured fish. The worm is armed with thousands of stinging bristles that can permanently numb a human being if that touches it. It is believed that Barry arrived in a delivery of coral but they didn't know how long he'd been in there. The worm was eventually lured into a tank of it's own.

http://www.dailymail.co.uk/sciencetech/article-1165930/Barry-giant-sea-worm-discovered-aquarium-staff-mysterious-attacks-coral-reef.html

More on polychaetes: http://en.wikipedia.org/wiki/Polychaete

50-ft Jurassic Jaws found in the Arctic

The 147 million year-old fossil remains of a large pliosaur were discovered at the Norwegian Arctic archipelago of Svalbard by scientists from the Natural History Museum of Oslo University. The creature, named "Predator X" by scientists, had a roughly 10-foot-long skull with 1-foot teeth and a bite strength of 33,000 lbs (15 tonnes) per square inch. It is estimated to have weighed 45 tonnes. The remains included a partial skull and 20,000 fragments of skeleton.

http://news.yahoo.com/s/nm/20090316/sc_nm/us_fossil_seamonster

Deep-water fish with see-through head

First discovered in 1939, the barreleye (Macropinna microstoma) has tubular eyes inside his transparent head. He can look forward or directly up by rotating the ultra-light-sensitive eyes to search for prey. The spots on the front of his head that look like eyes are actually nostrils

http://www.msnbc.msn.com/id/29354875/

See funny Stephen Colbert's great spot on the barreleye here