Scientists have found the oldest sperm ever discovered, and they are whoppers. They belong to a type of tiny crustacean called an Ostracod. The finding suggests that Ostracods evolved their gargantuan gametes far earlier than their rivals in the supersize sperm leagues, the fruit flies.
Read the Nature News story here: http://www.nature.com/news/giant-sperm-found-in-crustacean-fossils-1.15218
Read the original paper here: http://dx.doi.org/10.1098/rspb.2014.0394