] A tiny fossil of a creature that lived some 425 million
] years ago has entered the record books as the oldest
] unequivocally male animal. The organism, which resembles
] a cross between a shrimp and a clam, sports a large penis
] which has been perfectly preserved in three dimensions.

"Large" is relative here, since the entire organism is only 5 mm across. ;)

Recordbreakers -- World's oldest known penis