Rhyacophilidae

[under construction]. Rhyacophilidae is represented in Michigan by only one genus, Rhyacophila, with 6 species having been reported in the state and another 5 species that may possible occur based on their distribution and known nearby collection localities.

Adults

Larvae (adapted from Flint 1962)

1a	Anal proleg with an apicolateral spur	2
1b	Anal proleg without such a spur	3
2a(1a)	Apicolateral spur of proleg short and sharply decurved	Rhyacophila mainensis Banks
	also: Body segments alternating with dark and light bands
2b	Apicolateral spur long and evenly curved	Rhyacophila fuscula (Walker)
	also: Frontoclypeus with dark transverse bands anteriorly and posteriorly
3a(1b)	Abdomen bearing gills	Rhyacophila brunnea Banks
3b	Abdomen without gills	4
4a(1b)	Anal prolegs with a basalventral hook	5
4b	Anal prolegs without a free basoventral hook	7
5a(4a)	Anal claw without ventral teeth	Rhyacophila manistee Ross
	also: Head slightly longer than wide; Pronotum with 1-2 dark anterolateral setae in addition to corner setae
5b	Anal claw with ventral teeth	6
6a(5b)	a. Frontoclypeus with a distinct, dark V posteriorly	Rhyacophila torva Hagen
	b. Mandibles edentate
6b	a. Frontoclypeus without a distinct V posteriorly	Rhyacophila lobifera Betten
	b. Mandibles toothed apically
7a(4b)	Second segment of the maxillary palpus subequal to first	Rhyacophila glaberrima Ulmer
7b	Second segment of maxillary palpus longer than the first	8
8a(7b)	Anal claw without ventral teeth (carolina group)	Rhyacophila fenestra Ross and Rhyacophila ledra Ross
	also: Head with a distinct pattern of infuscations and muscle scars
8b	Anal claw with ventral teeth (invaria group)	9
9a(8b)	Second anal claw with second venral tooth	Rhyacophila invaria (Walker)
9b	Anal claw

References

Flint OS, Jr. 1962. Larvae of the caddis fly genus Rhyacophila in Eastern North America (Trichoptera: Rhyacophilidae). Proceedings of the United States National Museum, Smithsonian Institution 113(3464):465-493.

Rhyacophila vibox Milne