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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington
Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Caddisfly Family Polycentropodidae

These small caddisflies are of occasional importance, but the family doesn't include any major superhatches.

Where & when

In 1533 records from GBIF, adults of this family have mostly been collected during June (31%), July (27%), August (15%), May (15%), and September (6%).

In 509 records from GBIF, this family has been collected at elevations ranging from 3 to 10663 ft, with an average (median) of 1299 ft.

Family Range

Hatching behavior

The pupae emerge on the surface.

Egg-Laying behavior

Females of this family lay their eggs on the bottom, either by diving down or crawling down objects.

Larva & pupa biology

Diet: Smaller aquatic insects

Current speed: Slow or still

Shelter type: Wide variety of nets and net-like structures

Specimens of the Caddisfly Family Polycentropodidae

1 Adult
2 Larvae

Discussions of Polycentropodidae

Polycentropodidae or?
14 replies
Posted by LowBudget on Oct 1, 2013
Last reply on Jul 24, 2014 by Crepuscular
The first image is of a live caddis. It was collected from Trout Creek which is in the Delaware River watershed in upstate NY. The background is 1/4 inch ruled graph paper which is under the Petrie dish holding the caddis with water.

The second shows small silk nets found on rocks in the same stream during the same sampling.

I've been working all of my ID books including "Freshwater Macroinvertebrates of Northeastern North America" by Peckarsky.

The upper lip does not seem to have the T shape of a Fingernet caddis. It does have the heavy mandible with a brush of Polycentropodidae.

But, I'm not completely satisfied.

Anyone have thoughts on this?


Start a Discussion of Polycentropodidae


Caddisfly Family Polycentropodidae

Genus in Polycentropodidae: Holocentropus, Neureclipsis, Nyctiophylax, Polycentropus
4 genera (Cernotina, Cyrnellus, Plectrocnemia, and Polyplectropus) aren't included.
Family Range
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