Orb Weaver Spiders Info Sheet

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Arachnida Orb Weaver Spiders Class Order Family Species Arachnida Araneae Araneidae 2,500+ species Fir0002, flagstaffotos.com.au Range Reproduction Special Adaptations Worldwide Growth: gradual, molts several times until it reaches adulthood Web: The intricate distribution with 2,500+ eggs may be laid at one time by the larger orb circular webs that several hundred Egg: weaver. The mass of eggs is covered with a silken sheet to these spiders build species occurring produce an egg sac. Eggs are laid in the fall. help them to capture north of Mexico Immature: In some species the eggs hatch soon, in others not until prey. Although they the following spring. After hatching from the egg, the can’t see very well, spiderlings will remain in the egg sac, where they are the spiders are Habitat nourished by yolk material inside their abdomen, until sensitive to any after their first molt. vibrations in the web. Large variety of When an insect has habitats from been caught in the temperate to Physical Characteristics sticky threads the tropical, in rural as spider wraps it in silk well as urban Mouthparts: chelicerate, spider jaws are tipped by fangs with a duct (before or after biting areas. from a poison gland opening at the end of each it) and carries it to the Legs: 8 legs center or hub of the Spinnerets: these structures are located at the base of the abdomen web to be eaten. Niche and are used for producing silk Eyes: 8 eyes Poison: almost all They build their Egg: many eggs are laid within a silken egg sac spiders have venom circular webs in Immature: white at first, gaining color with each molt glands but most, open areas including the orb Adult suspended weavers, are not between whatever poisonous to humans. Color: each species is distinctly colored and patterned objects are These spiders use Size: range in size from a few mm to several inches. The males available. They are their venom to are smaller than the females and can be distinguished by often found in subdue their prey. their dark, rounded palps (these look like little boxing gardens gloves in front of their face). Body: come in many shapes but those found in the Bay Area Sources tend to have large rounded abdomens sometimes with Diet pointed protrusions. (2) (17) (37) Nature: feed on insects and other Some Common S.F. Bay Area Species arthropods caught in their webs Black and Yellow Argiope (Argiope aurantia) Captivity: 1 cricket Shamrock or Pumpkin Spider (Araneus trifolium) or moth or fly per Banded Argiope (Argiope trifasciata) week SaveNature.Org Updated 2010: SaveNature.Org • 699 Mississippi Street • Suite 106 • San Francisco, CA 94107 • [email protected] Original: Written by Leslie Saul and Esther Julier, LITES Project, Oakland, California © National Science Foundation, 1994.

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