Updates from May 6, 2007
This popular Catskill stream was a bit crowded on one of the prime days of the Hendrickson hatch.
Ephemerella aurivillii Mayfly Nymph
View 9 PicturesI'm pretty sure this is Ephemerella aurivillii. The body is 11mm long, which rules out most other species, and the hind legs seem to be more than 1.5 times longer than the fore legs -- a key characteristic for this species.
This specimen isn't in the best of shape, as it's missing all three tails, but it's the only one of its species I captured in this sample. Rhyacophila carolina (Green Sedge) Caddisfly Larva
View 8 PicturesThis specimens shows that the name "green rockworm" doesn't quite fit all Rhyacophila larvae, even though it does fit the majority. This is actually the first of their larvae that I've found in a different color. I'm not sure if it's because of the species or because this is a young one, but I have found equally small green larvae, so I'm guessing it's the species. Neophylax (Autumn Mottled Sedges) Caddisfly Larva
View 7 PicturesThe size of the head compared to the body in this larva is surprising, and I think this means it's a fairly 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 something which is going to get a lot bigger, but I'm not sure. Ameletus (Brown Duns) Mayfly Nymph
View 7 PicturesI think this is a pretty 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.) Ameletus nymph. It's certainly a striking one.
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