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Specimen Discussion

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Litobrancha	September 5th, 2006, 12:44 pm
Knoxville TN Posts: 51	Looks like Rhyacophila fuscula. Wonderful bug.
Jwatersphd	June 23rd, 2007, 6:35 pm
boulder colorado Posts: 2	i am curious how to tell rhyacophila from macronema and whether it makes any difference either in terms of size or behavior. in schweibert's first volume from years ago they look very similar. i am awaiting his new two volume set but in the meantime would be curious i if anyone knows. there is definitely a green caddis that is quite prevalent on the gunnison in the black canyon and probably gorge below but i have not been especially successful at devising a good imitation. after looking at oliver edwards's video on czech nymphing, however, i am thinking the big problem is that i did not tie in such a method as to emphasize the heavily segmented body.
	jwatersphd
Taxon	June 23rd, 2007, 10:32 pm
Site Editor Mercer Island, WA Posts: 921	Dr. Waters- Rhyacophila are in the family of free-living caddisflies (Rhyacophilidae), whose larvae are characterized by: only pronotum having a sclerotized plate, mesonotum and metanotum being entirely membranous; sclerotized plate on top of abdominal segment nine; anal prolegs long with large claws. Macronema (now Macrostemum, at least for those species of interest to flyfishers) are in the family of common net-spinner caddisflies (Hydropsycidae), whose larvae are characterized by: sclerotized plates on notum of all three thoracic segments; anal prolegs terminating in a brush of long setae. Incidentally, no Macrostemum species are known from Colorado.
	Roger Rohrbeck www.FlyfishingEntomology.com

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