cover image: The sac spiders of Canada and Alaska

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The sac spiders of Canada and Alaska

8 Mar 2010

Many of the members of this group are nocturnal, spending the daylight hours in the sac, whereas others are active in daylight or darkness and live mainly in the dimness between layers of plant litter in forests, bogs, or swamps. [...] The principal mouthparts and the legs project to the front or sides from the membrane joining the edges of carapace and sternum. [...] The book lungs open through a pair of slits at the lateral ends of the genital groove, and the tracheae open through a common tracheal spiracle (rrsp) located either immediately anterior to the spinnerets (spin) as in the Clubionidae (Fig. [...] Sac spiders are defined as those spiders in which the chelicerae close toward the midlini, the eyes are arranged in two transverse rows, the legs are prograde and bear two tarsal claws, the anterior spinnerets are close together and not more heavily sclerotized than the posterior spinnerets, and the palp-coxal lobes lack a depression on the ventral surface. [...] Measurements given in this work include total body length, measured from the anterior margin of the carapace to the anal tubercle, to the nearest 0.05 mm; carapace length, measured from anterior to posterior ends of the carapace along the middorsal line; and carapace width, measured at the point of greatest width in dorsal aspect.
zoology arthropods genitalia arthropod leg glossary of spider terms femur animal anatomy anatomical terms of location insect morphology tarsus chelicerates prolateral spider anatomy arachnids apophyses trochanter basitarsus embolus cymbium patella
Pages
198
Published in
Ottawa

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