|scientific name Brachycentrus |
common name American Grannom
Restricted to running waters.
Adults emerge between late June to mid-September.
Males are much smaller than females. The male maxillary palp is short, thick, composed of 3 subequal articles and densely pilose. Male labial palps are longer than the maxillary palps. The legs are spinate and covered with short hairs. Wings of the adults are sparsely covered with short hairs and the hindwing being subrectangular in shape, with a prominent anal area. Adult leg spur count is 2, 2, 2 or 2, 2, 3. Two of the thirteen species in North America occur here in Alberta (Wiggins, 1996); Brachycentrus americanus and B. occidentalis.
No information available.
The larvae are omnivorous, obtaining their food either by filter feeding or scraping.
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