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

Caddisflies of the Yukon 799
are detritivores, although some are algal grazers or predators. For pupation, the larval case
is sealed with perforate silk at each end, allowing water to circulate directly over the pupa.
Family Apataniidae
Five North American genera are assigned to this family and 2 of them occur in the
Yukon.
Genus Allomyia. Most of the species known in this genus are confined to cold mountain
streams of western North America; a few are known also in the Far East of Russia. Larvae
graze diatoms and fine organic particles from rocks.
40. Allomyia sp.
This record is based on one larval collection from the Yukon (10 ROME) which cannot be
identified to species.
Genus Apatania. Seventeen species of Apatania are known in North America, and many
others occur in the Palaearctic and Oriental regions. Larvae live in cool waters, usually
streams but also lakes at higher latitudes, where they scrape diatoms and other algae from
rocks (e.g. Irons 1988).
41. Apatania crymophila McLachlan (II) Holarctic, northwestern and central
Distribution: Yukon, Alaska, Manitoba; northern Europe and Asia.
Yukon records: 4, 8, 10, 12, 16 (ROME, SMDV).
Biological information: Adults have been collected in the Yukon 26 May –12 August.
42. Apatania stigmatella (Zetterstedt) (II) Holarctic, transcontinental
Distribution: Yukon, Alaska to Newfoundland; northern Europe through Siberia to Chukotka, Kamchatka
and the Amur basin (Levanidova 1982).
Yukon records: 8, 10, 11, 12, 16, 17 (ROME, SMDV, CNCI).
Biological information: Adults have been collected in the Yukon 15 July – 28 August.
43. Apatania zonella (Zetterstedt) (II) Holarctic, transcontinental
Distribution: Ellesmere Is. (Northwest Territories), Yukon, Alaska, Quebec, Minnesota; Greenland;
through northern Europe and Asia to the Amur basin (I.M. Levanidova, pers. comm.).
Yukon records: 4, 12, 16 (ROME).
Biological information: Adults have been collected in the Yukon 15 June – 6 August.
Family Brachycentridae
This is a small family of the northern hemisphere with 5 genera and about 30 species
in North America; larvae live mainly in flowing water.
Genus Brachycentrus. Larvae of Brachycentrus species live in larger and, on the whole,
warmer rivers and streams than do those of other genera in the family. Larvae feed on
suspended particles from the current and graze periphytic algae.
44. Brachycentrus americanus (Banks) (II) Holarctic, transcontinental
Distribution: Yukon, Alaska to California, Quebec, Massachusetts; Siberia, Mongolia, Japan.
Yukon records: 4, 10, 12 (ROME, SMDV).
Biological information: Adults have been collected in the Yukon 22 June – 9 August.
Genus Micrasema. Larvae are confined to small cold streams, where they graze algae and
moss from rocks.
45. Micrasema gelidum McLachlan (II) Holarctic, transcontinental
Distribution: Yukon, Alaska to Wisconsin and Quebec; northern Europe and Asia.
Yukon records: 1 (SMDV); 4, 8, 10 (ROME); 12 (NW 1984).
Biological information: Adults have been collected in the Yukon 30 June – 29 July.
Taxonomic notes: M. kluane Ross and Morse is a junior synonym (BotojAneanu 1988).