Physocyclus californicus

Chamberlin & Gertsch, 1929

A cellar in the Pholcidae, distributed across the southwestern United States and Mexico. are active during fall months, with males wandering in search of mates. The species frequently occurs in human dwellings, where it constructs webs in ceiling corners and other sheltered locations.

Pronunciation

How to pronounce Physocyclus californicus: //ˌfaɪsoʊˈsaɪkləs ˌkælɪˈfɔːrnɪkəs//

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Identification

Distinguished from the Pholcus phalangioides (long-bodied cellar ) by its more compact body proportions and geographic restriction to the southwestern United States and Mexico. Males possess a circular filament called the issuing from the , a structure used for sperm transfer during mating.

Habitat

Occurs in sheltered locations including the interior corners of ceilings in buildings, where it constructs tangled, irregular webs. Found in both natural and human-modified environments across its range.

Distribution

Southwestern United States and Mexico. Records from New Mexico and Colorado in the United States, with broader distribution extending through Mexico.

Seasonality

active during fall months, particularly November. Males engage in mate-searching during this period.

Behavior

Males wander in search of females during the breeding season. Multiple males may congregate near a female's web. When disturbed, individuals may exhibit rapid, vibrating movements typical of pholcid .

Ecological Role

of small and other in sheltered microhabitats.

Human Relevance

Common inhabitant of buildings in its range, where it contributes to control of small indoor pests. Often replaces Pholcus phalangioides as the indoor cellar in the southwestern United States.

Similar Taxa

  • Pholcus phalangioides cellar with more elongated body and longer legs; P. californicus has more compact proportions and is geographically restricted to southwestern North America.

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