By Richard J. Adams, Timothy D. Manolis
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Additional resources for Field Guide to the Spiders of California and the Pacific Coast States
This California endemic is fairly common in forested regions throughout the Coast Ranges of Southern California north to San Francisco Bay and in the Sierra Nevada north to the Lake Tahoe region. It has a diagnostic pair of pleurites extending backward from the posterolateral edge of its tan carapace, dark reddish-brown chelicerae, and a pale abdomen with reddish-purple speckling on the top and sides. M. fulva has two abdominal sclerites, one on its dorsoanterior margin and another, more difficult to see, directly above its pedicel.
39), also known as the wafer-lid trapdoor spiders, may be mistaken for ctenizids. Euctenizids, however, never build the thicklidded trapdoors characteristic of the Pacific coast’s ctenizids. On wafer-lid trapdoor spiders, the posterior lateral spinnerets are relatively long with multiple segments usually visible when viewed from above. Euctenizids are also generally less bulky with longer, thinner legs, and their abdomens are often patterned with either light and dark bands or chevrons. PACIFIC COAST FAUNA: Two genera, two regional species.
On wafer-lid trapdoor spiders, the posterior lateral spinnerets are relatively long with multiple segments usually visible when viewed from above. Euctenizids are also generally less bulky with longer, thinner legs, and their abdomens are often patterned with either light and dark bands or chevrons. PACIFIC COAST FAUNA: Two genera, two regional species. Along the Pacific coast, ctenizids are restricted to Southern and Central California. The more common of the two species is the California Trapdoor Spider, Bothriocyrtum californicum (pl.