Texas Spiders Funnel Web

[Spider Control] Alien Invasion

With all the threats, real and hypothetical, that this country frets about, a silent invasion has been occurring for centuries with little fanfare. Many of the spiders that are common to our homes are actually non-native species that have become established in North America and have spread across the continent.

Some probably came over with the first European settlers and have been here for more than two centuries. Several are worldwide tramp species, found on almost every continent. Quite often, they take over a habitat so profusely that they are the dominant species. For example, the Los Angeles County Museum of Natural History has been performing an area-wide spider survey for more than seven years; of the five most common spiders submitted by homeowners, only the western black widow is a native species.  

CELLAR SPIDERS . Several species of cellar spiders have become well established in North America, all of which have long, spindly legs. They are one of the major reasons why homeowners request spider control measures around their homes.

The most common species is the long-bodied cellar spider, Pholcus phalangioides, which has a uniformly grey body and is a common resident of basement and window wells. It has some dark markings on the front part of its cephalothorax which people mistake as a violin and, therefore, this spider is mistaken for a brown recluse. It has been on this continent for more than a century, originating from Europe, and is found throughout much of the United States.

In the southwestern U.S., the marbled cellar spider, Holocnemus pluchei, has a brown sternum and brown longitudinal stripe on its belly, with all leg joints possessing a white ring surrounded by black rings. It is common around homes, found inside in the corners of the ceiling as well as in the eaves of the house. The marbled cellar spider is of Mediterranean origin and is thought to have entered the country in the San Francisco Bay area around the middle of the 20th century. It has spread throughout coastal California, into Arizona and New Mexico. In many places in Southern California, it is the most common spider around house eaves.

From Texas to Florida, another cellar spider with no common name, Crossopriza lyoni, (from southeast Asia) has an abdomen that looks like the end has been chopped off because it ends sharply with a flat surface rather than tapering gently. These cellar spiders can be major nuisances because of the cobwebs they leave behind.

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