Giant sperm stretch back millions of years

http://www.newscientist.com/article/dn17331-giant-sperm-stretch-back-millions-of-years.html

19:00 18 June 2009 by Ewen Callaway
There's sperm and then there's super sperm – gigantic reproductive cells many times longer than the minute crustaceans that produce them. Now, scientists have discovered that ostracods, or seed shrimp, have been cranking out these giant sperm for at least 100 million years.
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Matzke-Karasz says it's impossible to know just how long their sperm cells were, but closely related species that are still around produce sperm at least the length of their body. Such a long history for giant sperm points to intense sexual competition between males, she says. Females gather sperm from multiple males before fertilizing their eggs, but researchers don't have a clue what determines success.