Caddisflies of the Yukon - Department of Biological Sciences ...

Caddisflies of the Yukon 811
Genus Phryganea. This is an Holarctic genus with 2 North American species living in lentic
waters. One of them, P. cinerea, is common throughout northern and montane areas.
140. Phryganea cinerea Walker (I) Nearctic, transcontinental
Distribution: Yukon, Alaska to Newfoundland and California, North Dakota, Ohio.
Yukon records: 4, 10, 12, 17 (ROME); 17 (NW 1984).
Biological information: Adults have been collected in the Yukon 15 June – 27 July.
Genus Ptilostomis. This Nearctic genus of 4 species includes 2 with transcontinental
distributions; in addition to P. semifasciata, P. ocellifera (Walker) has been recorded from
Alaska and British Columbia (Liard R. Hot Springs Prov. Pk., 59°26′N 126°04′W, 8.vi.80,
ROME), and probably occurs in the Yukon. Larvae are predacious for the most part, and
live in all types of aquatic habitats, including temporary pools.
141. Ptilostomis semifasciata (Say) (I) Nearctic, transcontinental
Distribution: Yukon to Newfoundland, Virginia.
Yukon records: 6, 12, 17 (ROME).
Biological information: Adults have been collected in the Yukon 22 June –13 July.
Family Uenoidae
This is a family of the northern hemisphere with 5 North American genera, all inhabiting
rapid streams (Vineyard and Wiggins 1988). Two genera are recorded from the Yukon, and
one other, Neophylax, is represented in Alaska. Larvae graze algae and fine organic particles
on rocks.
Genus Neothremma. This genus is restricted to western montane North America where 7
species are known (Wiggins and Wisseman 1992). Larvae occur in rapid streams, and we
have collected them at several Yukon sites.
142. Neothremma didactyla Ross (I) Nearctic, western montane
Distribution: Yukon to Oregon.
Yukon records: 15, 17 (ROME).
Biological information: Adults have been collected in the Yukon 23 July.
Genus Oligophlebodes. This is a Nearctic genus of 7 western species; larvae are confined
to turbulent mountain streams.
143. Oligophlebodes ruthae Ross (I) Nearctic, western montane
Distribution: Yukon to Utah.
Yukon records: 17 (SMDV).
Biological information: Adults have been collected in the Yukon 23 July.
144. Oligophlebodes sierra Ross (I) Nearctic, western montane
Distribution: Yukon, Alaska to California.
Yukon records: 16 (ROME).
Biological information: Adults have been collected in the Yukon 29 July.
145. Oligophlebodes zelti Nimmo (I) Nearctic, western montane
Distribution: Yukon to Montana.
Yukon records: 17, 19 (NW 1984).
Biological information: Adults have been collected in the Yukon 23 – 24 July.
Taxonomic Notes
Note 1. Rhyacophila mongolica Schmid, Arefina and Levanidova (14)
Among a series of 5 pharate adults collected by a Royal Ontario Museum field party in
the Yukon (30 mi W Old Crow, Sunaghun Cr., 16.vii. 1981, ROME #810565), one well
developed male (Fig. 2) is considered conspecific with specimens of R. mongolica (Schmid