Hydropsyche sp. - pupal cases and pupae - voucher specimens, in alcohol - Hydropsyche - BugGuide.Net

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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Caddisflies (Trichoptera) » Annulipalpia » Hydropsychoidea » Netspinning Caddisflies (Hydropsychidae) » Hydropsychinae » Hydropsyche

Photo#883507

Copyright © 2014 Mark Melton

Hydropsyche sp. - pupal cases and pupae - voucher specimens, in alcohol - Hydropsyche

Healdsburg, Russian River, Sonoma County, California, USA
April 3, 2013
Size: cases 16 mm pupae 13 mm

Keyed to family using Merritt, Cummins and Berg (2008). MCB has illustrations of a Hydropsyche pupa which is very similar to these specimens. Also the only genus of Hydropsychidae collected as larvae in the area sampled. On the left, dorsal view; on the right ventral view.

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Hydropsyche sp. - pupal cases and pupae - voucher specimens, in alcohol - Hydropsyche

Hydropsyche sp. - pupal cases and pupae - voucher specimens, in alcohol - Hydropsyche

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Contributed by Mark Melton on 11 January, 2014 - 7:29pm

ffemale

you can see from the 4th photo of the venter its a female. The wide, flattened mid tarsal segments are typical of many Hydropsychidae. They use them to skitter/skate along the surface as the females emerges from the pupal cast. The dark wingpads indicate it was going to emerge within the next 3-4 days. When the wingpads are this dark you can probably see enough of the genitalia to determine genus and species. Depending on the species you may have to clear it to see the necessary parts.

In the left pupal case you can also see two cases of midge larvae. Chironomids and oligochaetes are often found using caddis cases for habitat.

… Dave Ruiter, 11 January, 2014 - 10:39pm

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Dave-

Thanks, changed the last two photos (same specimen) to show the sex. I'll have to take a closer look and see whether I can determine the species.
A lot of the pupal cases I've collected have the chironomid cases on them but I've never worked up much enthusiasm about attempting to identify them to genera or species.
I've noticed that the pupal cases cases are very strongly built. is this true with other Hydropsyche species?

… Mark Melton, 13 January, 2014 - 9:26am

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