Vol 90 (1993)

Journal of the Entomological Society of British Columbia


Cover Page
COVER: Male Cybaeus multnoma Chamberlin and Ivie (Araneae, Cybaeidae) drawn by Robb Bennett. Scale bar = 2 mm. Individuals of about two dozen species of this Holarctic genus are dominant generalist predators in the forest floor arthropod community of the Pacific Northwest especially in coastal regions. Six species are known to occur in British Columbia. Cybaeus reticulatus Simon and C. morosus Simon are abundant in a variety of coastal habitats from San Francisco to the outer Aleutian Islands (in the Queen Charlotte Islands the former is found from sea level wet forests to alpine meadows). Cybaeus signifer Simon and C. eutypus Ch. and Ivie are very common in south eastern B.C. They range from mid-coastal B.C. south to Big Sur and the Yosemite area (C. signifer) and from the Queen Charlotte Islands to mid-coastal Oregon and the Willamette Valley (C. eutypus). Two other species have more restricted ranges: C. sinuosus . Fox is apparently endemic to the Canadian Rockies in Banff, Jasper, and Yoho National Parks and a new species is found in south central B.c. and adjacent Washington from Lillooet through the Okanagan Valley to Okanogan County. Many species of Cybaeus (most notably in Japan, California, and Oregon) have extremely restricted ranges and are known from only a few specimens. From: Bennett, R.G. 1991. The systematics of the North American cybaeid spiders (Araneae, Dictynoidea, Cybaeidae). Ph.D. dissertation, Univ. of Guelph, 308 pp.