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 |
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table incomplete |
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