[最古老「精子」化石藏於一億年前緬甸琥珀中!]
[Scientists discover 100 million years ago world's oldest
sperm in amber]
An international research team has found the oldest ever sample of animal sperm, which predates previous records by 50 million years. The specimen of "giant" sperm, from the marine species ostracod, was preserved in a piece of amber in Myanmar and is roughly 100 million years old. The sperm was found in the reproductive tract of a female that had clearly just mated.
The findings suggest that the unique reproductive features of these animals have remained unchanged for millions of years. This specimens is approximately 50-million year older than the two fossils of animal sperm previously considered the oldest, one from an unknown source found in amber in France, and a second embedded in an Antarctic segmented worm cocoon.
It is also 83 million years older than the previous record for ostracod sperm, which was found at Riversleigh, in Australia.
Research article: https://rs.figshare.com/…/Supplementary_material_fr…/5106105
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