On-stream insect photos from Miscellaneous
This nighttime flash photograph shows a bunch of Ephoron
mayflies flying around during the hatch. So many of them fly around with their dun shucks (Shuck: The shed exoskeleton left over when an insect molts into its next stage or instar. Most often it describes the last nymphal or pupal skin exited during emergence into a winged adult.)
attached that it seems like they molt from the dun to spinner stage in mid-air. Actually they molt on streamside vegetation like other mayflies, but they sometimes take off to mate before they're completely finished.
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