False widows will tolerate moist environments. Its venom is not as intense as the Black Widow. Yellow sac spiders do not make a web, but may make a conspicuous molting chamber. Berkeley CA 94720 (photo: Will Chatfield-Taylor)], Calisoga longitarsus (Nemesiidae) – “Calisoga spider,” “False tarantula.”, “I can’t believe it’s not a tarantula!”  Often mistaken for a tarantula, Calisoga  is smaller and unable to climb smooth surfaces.

UC IPM pest management guide to spiders  Lindsey), right: P. audax (photo: Tom Murray)], Essig Museum of Entomology Male. Each sac can contain 200 or more cream-coloured eggs. Common garden spiders video and Titiotus spp. [left: Pholcus (photo: Jerome Rovner), right: Holocnemus (photo: I.R. [photo: Cheryl Moorehead], Parasteatoda tepediorum (Theridiidae) – “American house spider”, A common invasive, believed to be from South America. [photo: Bryan Reynolds], Steatoda grossa (Theridiidae) – “false black widow”, “European house spider”, Another European invasive, this spider seems to be displacing our native black widows in urban areas. Back to Natural History of Orange County, California. Female. (Lycosidae) – “wolf spiders”, Wolf spiders are difficult to identify even to genus without a microscope, but most found around homes turn out to be in the genus Pardosa. (Zoropsidae), Superficially, tengellids are sometimes confused with brown recluse (which do not occur in California), but lack the violin-shape pattern on the carapace, and have eight eyes rather than six. Newport Beach, Orange County, CA. (Salticidae) – “jumping spiders”, There are many jumping spiders around the home and garden, but of the common ones Phidippus are the most conspicuous. Rather than make webs, these spiders are sit-and-wait predators. The web is a mesh, often with a distinct lattice pattern, commonly seen on fence posts, street signs, and side-view mirrors. Based on collected data, the geographic range for Steatoda grossa includes 13 countries and 12 states in the United States. Sometimes confused with “daddy long-legs”, which are not spiders, but rather Opiliones (“harvestment”). Laguna Beach, Orange County, CA. Fountain Valley, Orange County, CA. Steatoda grossa has been primarily sighted during the month of March. Their venom works the same way as the Black Widow's but far less intense. 02/08/09. The spider species Steatoda grossa, commonly known as False Black Widow, belongs to the genus Steatoda, in the family Theridiidae. [photo: Martin Putnam], Cheiracanthium spp.

The spider species Steatoda grossa, commonly known as False Black Widow, belongs to the genus Steatoda, in the family Theridiidae.Steatoda grossa spiders have been sighted 177 times by contributing members. SpiderBytes blog © Peter J. Bryant. [left: female (photo: Anca Mosoiu), right: male (Omeuceu)], Anachemnis spp. Typically only visible in their web at nighttime; spends the day hiding in crevices or holes on outskirts of web. As with tarantulas, the spiders are usually safely hidden in their burrows, and wandering males are the most likely to be encountered. Steatoda grossa (Theridiidae) – “false black widow”, “European house spider” Another European invasive, this spider seems to be displacing our native black widows in urban areas. There is considerable variation in color and form.

lynx spiders do not make webs. However, instead of being nearly aggressive, the false widows are rather shy, choosing to flee if an intruder attacks their web, and might only sting when cornered. Lateral eyes are nearly touching. Has been known to feed on real “black widows” (genus. Less frequently seen is P. longipalpis. [photo: Stephen Lew], Peucetia viridans (Oxyopidae) – “green lynx spider”, Common in gardens. Females are variable in color and pattern depending on their age. The False Black Widow gets its name because it looks like the famous Black Widow. Older adult specimens often lose their abdominal pattern and appear solid black, brown, or purplish; younger specimens have a unique pattern with a pale band across front of abdomen and additional pale spots or chevrons behind. The fact is, these spiders do carry venom, but it is not particularly potent to humans, but are used only to capture their prey. Male. In our experience, black widows like very dry environments, so unless your worm bin is very dry, I wouldn’t expect to find them there. The similar Calisoga thevenetti is less frequently seen. Based on collected data, the geographic range for Steatoda grossa includes 13 countries and 12 states in the United States. Wolf spiders do not make a web except for the infrequently seen Sossipus which makes a sheet web. They are annecdotally associated with mildly symptomatic envenomations, but there are no studies or data supporting this. [photo: Tom Murray], Zoropsis spinimana (Zoropsidae) – “zoropsids”, A recently arrived mediterranean invasive, now found in the Bay Area. [left: P. johnsoni (I.R. 1101 VLSB #4780 5/29/07. and are mistakenly thought to be as dangerous.

[photo: Ian Pembroke], Neriene digna (Linyphiidae) – “money spider”, There are lots of linyphiids, and the taxonomy is a real mess. Their cousins (Tegenaria spp., Agelenidae), including the domestic house spider and hobo spider, are more common indoors in some parts of the western states. Neriene digna (photo of courting pair, male on left) is particularly common in the Bay Area in the spring. Linyphiid webs are usually flat sheets under which the spider hangs upside-down. Males are often seen wandering in search of females in the fall. The dense webs form a sheet that narrows to a tube or funnel where the spider hides awaiting prey on its web.



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