Long-bodied Cellar Spider, Daddy Long-legs Spider, Cellar Spider
Pholcus phalangioides
Family Pholcidae (Cellar Spiders), Order Araneae. Key family characteristics include extremely long, fragile legs and an elongated or oval abdomen.
Physical Description
The spider has a small, oval to slightly rectangular cephalothorax and a distinctly elongated, cylindrical abdomen. Its proportions are defined by very long, spindly legs attached to a compact central body. The body texture is smooth with sparse hairs, and it has a delicate, translucent appearance.
Size Estimate
Body length is typically 7 to 10 millimeters, with a total leg span reaching up to 50 to 70 millimeters. This specimen appears to be an adult.
Coloration & Markings
Pale, translucent grey, beige, or light brown overall. The cephalothorax often features a distinct dark grey or brown marking near the center, and the abdomen may show faint darker spots or chevron patterns.
Web Type
Builds irregular, messy, three-dimensional tangle webs in corners of ceilings, cellars, or dark areas. These webs are not sticky like orb webs; instead, prey becomes hopelessly entangled in the loose, multidirectional threads.
Eye Arrangement
Consists of eight eyes grouped closely together on an elevated portion of the cephalothorax. There are two triads of darker lateral eyes and a pair of smaller median eyes.
Leg Characteristics
Legs are exceptionally long, thin, and delicate, lacking heavy spination. They are typically light tan or grey with subtle darker banding at the joints. When disturbed, the spider engages in a rapid vibrating or bouncing defense mechanism.
Venom & Safety Information
Venom Information
Possesses mild, insect-specific venom delivered via tiny chelicerae. The venom is specialized for subduing arthropod prey and has virtually no toxic effect on humans.
Medical Significance
Completely harmless and medically insignificant. Their mouthparts are generally too small or weak to pierce human skin, and their venom poses no danger to people. They are beneficial household guests.
Safety Recommendations
No safety precautions are necessary as these spiders are completely harmless. If unwanted, they can be gently relocated outside or using a cup and paper without any risk of a bite.
Habitat & Behavior
Habitat & Range
Cosmopolitan distribution globally. Found almost exclusively indoors in human habitations, particularly in cellars, basements, crawlspaces, garages, and upper corners of rooms. Prefers dark, humid, undisturbed microhabitats.
Behavior & Temperament
Docile and completely harmless to humans. When threatened or disturbed, it bounces or rotates rapidly in its web to create a blur, making it difficult for predators to target. It is strictly sedentary and nocturnal to crepuscular in hunting activity.
Diet & Prey
Feeds primarily on other insects and spiders, including notorious pests like mosquitoes, flies, and occasionally larger spiders such as funnel-web spiders or even black widows, which it defeats using its long reach and wrapping silk.
Seasonal Activity
Active year-round indoors where climate-controlled environments provide stable temperatures. Mating can occur at any time of the year in indoor settings.
Description
The long-bodied cellar spider is a familiar and harmless indoor companion found across the globe. Known commonly as the daddy long-legs spider, it is easily recognized by its tiny body and extraordinarily long, spindly legs draped across a messy corner web. Despite their fragile appearance, these spiders are formidable predators of other household insects and arachnids.
Key Features
Extremely long and thin legs, an elongated cylindrical abdomen, a pale translucent body, and the characteristic rapid vibrating behavior when disturbed.
Similar Species
Harvestmen (Order Opiliones), which are not true spiders and lack a segmented waist and silk glands; Pholcus opilionoides and other Pholcidae species, which generally share similar body plans and harmless temperaments.
Life Cycle
Females produce loose silk egg sacs containing 20 to 60 eggs, which they carry in their jaws until hatching. Spiderlings undergo multiple molts as they grow. Adults can live for several years under favorable indoor conditions.
Ecological Importance
Act as natural pest control agents inside homes and buildings, helping to regulate populations of flies, mosquitoes, and other potentially problematic insects.
Conservation Status
Not evaluated by the IUCN, but populations are extremely stable, widespread, and thriving globally alongside human habitations.
Interesting Facts
Cellar spiders are famous for their rapid vibrating defense display, which earned them the nickname 'vibrating spiders'. An urban legend claims they possess the most potent venom of any spider but cannot bite humans; this is scientifically false.
Photography Tips
Use macro lenses with a high depth of field to capture both the tiny cephalothorax and the sprawling legs. Diffused lighting works best to avoid harsh reflections on the translucent body, shiny body.
Identified: 2026-07-30T00:00:32.740882