Tonight, I finally got around to cropping and examining the photo. And it's no copepod that I recognize.
|Speck with eyelashes|
For one thing, it has two eyes. The shape is right, but the tail is different. A female copepod often carries eggs at the rear, but in two fat sacks, not 4 pointed, hairy ones.
It doesn't look like an amphipod, either; an amphipod usually holds the antennae forward, not off to the sides. It almost always has long hind legs sticking out at odd angles from the back; when the tail end is curved inward, from a front view, it would be nicely rounded, with those legs well out to the side. The eyes are too small.
I've spent hours looking for one like it.
I give up.
Help! What is this?