Scientists have discovered what may be the oldest known unequivocally male animal fossil. Like the male leads in the film “The Full Monty,” this 5-millimeter crustacean from Britain bares all — though ...
From Matzke-Karasz et al. 2009. A. Zenker Organ, a specialized organ modified from the vas deferen that serves asa pump for giant sperm. B&C The heavily coiled giant sperm with anteriour (an) and ...
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