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

796 G.B. Wiggins and C.R. Parker
19. Rhyacophila verrula Milne (I) Nearctic, western montane
Distribution: Yukon, Alaska to California and New Mexico.
Yukon records: 11, 17 (SMDV).
Biological information: Adults have been collected in the Yukon 23 July – 3 August.
20. Rhyacophila vobara Milne (I) Nearctic, western montane
Distribution: Yukon, Alaska to Oregon and Montana.
Yukon records: 12, 17 (NW 1984).
Biological information: Adults have been collected in the Yukon 23 June – 27 July.
21. Rhyacophila vocala Milne (I) Nearctic, western montane
Distribution: Yukon to Montana and California.
Yukon records: 10 (CNCI); 16 (ROME); 17 (SMDV).
Biological information: Adults have been collected in the Yukon 9 – 27 July.
22. Rhyacophila vofixa Milne (I) Nearctic, western montane
Distribution: Yukon, Alaska to Utah
Yukon records: 8 (ROME); 12, 16, 17, 19 (NW 1984).
Biological information: Adults have been collected in the Yukon 23 July –1 August.
Suborder Annulipalpia
These are the retreat-making or net-spinning caddisflies whose larvae are concealed in
fixed tubular retreats or nets on rocks, logs, and plants. Most of the larvae live in running
waters; some construct fine-meshed nets of silk to strain suspended food materials from the
current, others graze fine organic particles or prey on insects. Pupation occurs in open
perforate cells, with water circulating through the cell around the pupa.
Family Hydropsychidae
Hydropsychids are the dominant caddisflies of running waters over much of North
America, both in species diversity and in biomass, but the family is markedly reduced in the
Yukon. The family is widespread throughout the world; 11 genera with approximately 150
species are represented in North America, but only 4 genera are known in the Yukon. Larvae
construct nets of silken meshes which filter suspended particles and insects from the current,
the size of the mesh differing in most genera.
Genus Arctopsyche. Species of Arctopsyche occur through much of the Holarctic and
Oriental regions; 4 are known in North America. Larvae construct coarse-meshed filter nets
and are primarily insectivorous.
23. Arctopsyche grandis (Banks) (I) Nearctic, disjunct
Distribution: Yukon to California, with a disjunct occurrence in Quebec.
Yukon records: 10, 11, 19 (ROME).
Biological information: Adults have been collected in the Yukon 23 July – 3 August.
24. Arctopsyche ladogensis (Kolenati) (II) Holarctic, transcontinental
Distribution: Yukon, Alaska to Newfoundland and New Hampshire; a record from Utah (Baumann
and Unzicker 1981) leaves a large gap to the Yukon in the recorded distribution of this species in
western North America; northern Europe and Asia through Siberia to Mongolia and Kamchatka
(Lepneva 1964), but not recorded from Chukotka (Levanidova 1982).
Yukon records: 4, 12, 17 (ROME); 10 (NW 1984).
Biological information: Adults have been collected in the Yukon 26 June –14 August.
Genus Cheumatopsyche. Some 40 species of this genus are known in North America, and
the group is widespread through most other faunal regions.