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Desert Tarantula


Photo © by Bob Kolbert

Image taken in Tucson, Arizona submitted by an anonymous reader taken on Aug. 16, 2002.

Therophosidae -- Tarantula Spider Family

This handsome and mostly harmless male tarantula was out searching for a suitable mate when encountered in a driveway in northeast Tucson. Normally this is an end-of-life adventure for a tarantula. Predation by an owl or other predator is a distinct possibility. Otherwise they will burn all their remaining energy searching. Success in finding a female may even end in being her next meal. Normally by October the current year's mature males have all died. Their sperm cells will live on, however, for many years within the female inside a special sac, the spermatheca, fertilizing her eggs as needed. Female spiders rarely leave the safety of their silk-lined burrows.

Sonoran Desert Tarantulas may bite in defense, but their most effective weapon is the abundant, irritating hairs on the abdomen. A skunk or grasshopper mouse seeking to dine on a tarantula must deal with these hairs or else suffer the consequences. In the McDowell Mountains M. Plagens found dozens of tarantula chelicerae (fangs) in great-horned owl pellets.

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