This is a tiny Ephemerellid mayfly about 3mm long, certainly an early instar (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.) of whatever species it belongs to. I looked at it under a microscope and determined that it has gills on abdominal segments 3-7, no abdominal tubercles (
Tubercle: Various peculiar little bumps or projections on an insect. Their character is important for the identification of many kinds of insects, such as the nymphs of Ephemerellidae mayflies.), and only minute black hairs on the tails as far as I can tell.
A few (not all) of the abdominal tubercles on this Ephemerella needhami
nymph are circled. They are especially large in this species.
This mayfly was collected from unknown on February 5th, 2004 and added to Troutnut.com on January 25th, 2006.
Start a Discussion of this Nymph:
You must log in
at the top of the page to post. If you haven't registered yet, it's this easy: