Come on and Get Your Overdose

"New" class of prehistoric fish found collecting dust in museums' archives completely changes palaeontology's view of a once-disregarded "footnote to evolution." Bonus: they're enormous (30-50 feet), spanned over 100 million years, and once filled a niche now filled by whales. FISH MATTER TOO!

http://www.wired.com/wiredscience/2010/02/giant-filter-fishes/