Definitely a Jenny Spinner, the male Iron Blue spinner. Four of the small olive spinners ( baetidae) are pretty similar at first glance. They all have the 3 dark 'bum' segments, and dark thoraces (chests ), some darker than others, and the bums vary a lttle in shade. Jenny Spinner has the darkest, anthracite black, usually. The Jenny's eyes are dark, reddish-brown, while Pale Watery spinner has the brightest yellow eyes in the olive family. Small Spurwing male spinner eyes are more orange-yellow. In my experience, eyes of the Small Dark Olive male spinner, July Dun ( female is Little Red ) are more of a red-orangey colour; but these colours are not entirely reliable in all instances. Cheers. TC
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