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Species Page - Capnia vernalis
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scientific name    Capnia vernalis    

habitat
Larger, warmer rivers.

seasonality
Adults emerge from February to April.

identification
This small (length = 4.5 to 6.5 mm for males and females respectively) winter stonefly has the male ninth sternum produced posteriorly into a bluntly pointed subanal plate with an elongate process at the tip lying between the subanal lobes. The elongate process has a second acute anterior projection dorsal to the sternum. Subanal lobes are each subacute and marked off from the sternum by a deep notch. The supra-anal process is extended forward to the hind margin of the ninth tergum; its distal one-third is narrower than the proximal two-thirds, and the tip is pointed. Female subgenital plate has a strongly sclerotized posterior lip about one-third the width of the sternum. The sclerotized floor of the genital tract is visible through the exoskeleton anterad to the posterior lip of the subgenital plate. Sterna 7 and 8 are connected by a narrow sclerotized bridge.

life history
Eggs are laid in spring, hatch, and nymphs diapause throughout summer. Nymphal development occurs throughout fall and winter.

conservation
There are no major concerns.

diet info
Nymphs are detrivorous.

range
In Alberta, the species is known from the Saskatchewan River system. Capnia vernalis is widespread and common in North America, ranging from British Columbia to Quebec.

quick link
http://entomology.museums.ualberta.ca/searching_species_details.php?s=2131



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