Psilochorus apicalis

Members of Psilochorus can be distinguished from the more common Pholcus by their generally smaller body size and subtle differences in eye arrangement and leg proportions. P. apicalis specifically may be recognized by characteristics of the male pedipalps and female epigynum, though detailed morphological descriptions are sparse in the literature. The species name 'apicalis' likely refers to markings or features at the apex of a structure, possibly the abdomen or legs.

As a cellar spider, it inhabits dark, sheltered microhabitats including caves, cellars, rock crevices, and undisturbed building interiors. These environments provide the stable humidity and protection from predation and desiccation that pholcid spiders require.

United States. Records indicate presence in North America with confirmed occurrences in the USA, though specific state-level distribution details are limited.

Constructs irregular, three-dimensional cobwebs with no distinct pattern. When disturbed, exhibits the characteristic pholcid defense behavior of rapid, vibrating movement that renders the spider difficult to target visually. This vibration, combined with the spider's slender build, makes it appear as a blur to potential predators.

Serves as a micro-predator in cave and subterranean ecosystems, contributing to regulation of small arthropod populations in these food-limited environments. Its presence in anthropogenic structures indicates adaptability to human-modified habitats.

Occasionally encountered in basements, cellars, and outbuildings where it is generally considered harmless. Like other pholcids, it is sometimes subject to exaggerated claims regarding venom potency, though no medical significance has been documented.

• Pholcus phalangioidesThe long-bodied cellar spider is more cosmopolitan and larger; differs in body proportions and typically shows more pronounced abdominal patterning.
• Psilochorus simoniAnother North American Psilochorus species; separation requires examination of genitalic structures.
• Holocnemus plucheiThe marbled cellar spider has a more robust build and distinct abdominal markings; native to Mediterranean region but introduced to Americas.

• spider
• cellar spider
• cave-dwelling
• North America
• Pholcidae

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• Catalogue of Life
• Primary Type List | Entomology Research Museum
• Meloidae Holdings | Entomology Research Museum
• Encyrtid Holdings | Entomology Research Museum
• Bizarre, beautiful extremes | Beetles In The Bush