Download The Orb-Weaving Spiders of Canada and Alaska: Uloboridae, by C. D. Dondale, J. H. Redner, P. Paquin PDF

By C. D. Dondale, J. H. Redner, P. Paquin

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Extra info for The Orb-Weaving Spiders of Canada and Alaska: Uloboridae, Tetragnathidae, Araneidae, Theridiosomatidae) the Insects and Arachnids of Canada

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Hyptiotes Walckenaer (p. 34) 1'. Yeux latéraux postérieurs de la même dimension que les autres yeux; ne se trouvant pas sur des tubercules. Rétrécissement graduel du céphalothorax dans sa partie antérieure (fig. 31) . . . . . . Uloborus Latreille (p. 40) Genus Hyptiotes Walckenaer Members of the genus Hyptiotes build webs in the lower branches of coniferous trees, often among dead twigs in the tree's interior, although occasional specimens may be found in the underbrush or even on cliffs or in ravines.

There are no orb weavers on Schmidt’s list, and only a few scattered references to bites by araneids or tetragnathids exist (Bonnet 1945, Gertsch 1955, Gorham 1968). Quistad et al. (1992) found orb-weaver venoms relatively weak in comparison with various medically important venoms produced by black widows and ground spiders. Gertsch (1979:233) lists among the “lesser offenders” representatives of three araneid genera, namely Neoscona, Argiope, and Araneus, all rather large when mature and capable of pricking a finger when picked off the web.

Biology. Individuals of U. glomosus build horizontal orb webs 10–15 cm in diameter. A meshlike hub is present, and the innermost sticky spirals are well separated, those toward the periphery being closer together than those inside (Emerton 1902, figs. 495–497). There may also be zigzag lines of loose silk across the centre or inside the innermost sticky spiral, as well as a linelike stabilimentum. Maturity is reached in May or early June, and eggs are laid in late June and in July (Kaston 1948).

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