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A CLOSER LOOK

Cellar Spider

Pholcidae

Long-legged spiders common in basements, crawl spaces, and utility rooms. They thrive where moisture and small insects are present.

Learn what to look for
Type
Spiders
Season
Year-round
Where found
Basements, crawl spaces

01 / IDENTIFICATION

How to recognize it.

  1. Legs

    Extremely long and thin. The legs are much longer relative to the body than most household spiders.

  2. Body

    Small narrow body. Longbodied cellar spiders have a slim cylindrical abdomen.

  3. Web type

    Loose irregular web. Webs appear in protected corners rather than flat funnels or classic orb webs.

  4. Behavior

    Hangs upside down. They often rest upside down and may shake rapidly when disturbed.

  5. Location

    Dark protected rooms. Basements, garages, cellars, crawl spaces, and warehouses are common.

  6. Risk

    Not dangerous. They are nuisance web builders, not medically significant spiders.

More identification clues
  • Long-legged spiders hanging upside down in loose irregular webs.
  • Activity in basements, crawl spaces, garages, cellars, warehouses, or dark quiet corners.
  • Webs that expand across protected ceiling or wall corners.
  • Rapid vibration or bouncing in the web when disturbed.
Clues that suggest a different pest
  • A round-bodied cobweb spider with egg sacs may be a common house spider.
  • A fast ground-running spider without a web points toward wolf spiders or grass spiders.
  • A compact daytime spider that jumps is more likely a jumping spider.
  • A non-web-building eight-legged animal with a single oval body is not a true cellar spider.

02 / A CLOSER LOOK

Where it lives. What to watch for.

Cellar spiders thrive where a protected corner is left undisturbed and small insects are available. Their webbing can build up even when the spiders themselves are harmless.

Dark corners

Start in ceiling corners, joists, utility rooms, and storage edges.

Undisturbed walls

Stored items, overhead doors, and shelves can collect webs.

Protected voids

Low-disturbance spaces can support larger web networks.

Seasonal activity

Cellar spiders can be found year-round indoors in Cincinnati because protected basements, garages, and crawl spaces buffer them from outdoor weather.

Signs you may notice
  • Loose webbing accumulating in dark ceiling or wall corners.
  • Long-legged spiders suspended in webs rather than moving across floors.
  • Egg-carrying females or repeated small spiders near the same web sites.
  • Prey insects caught in the webs.
Life cycle and behavior

Irregular web

They wait in loose webs and rely on prey contacting the silk.

Protected structure

Large web clusters usually mean the area is quiet and not being regularly cleaned.

Small insects

Reducing other insects helps reduce the reason cellar spiders stay.

03 / COMPARE

Could it be something else?

Common House Spider

Common house spiders have rounder abdomens and denser cobwebs.

Yellow Sac Spider

Yellow sac spiders hide in small silk retreats and hunt at night rather than staying in open webs.

Wolf Spider

Wolf spiders are ground hunters without capture webs.

House Centipede

House centipedes have many more legs and run quickly on walls and floors.

04 / NEXT STEPS

What to do if you find them.

Good cellar spider work is simple and physical: remove webs, reduce prey insects, lower clutter, and treat or seal repeated harborage edges where needed.

  1. Track where Cellar Spider is appearing before treatment.

  2. Reduce moisture, clutter, food access, or exterior harborage where possible.

  3. Avoid heavy DIY spray use when identification is uncertain.

  4. Use the service page or quote form when activity repeats or spreads.

What an inspection considers
  • Confirm the Cellar Spider identification before choosing products or methods.
  • Inspect Basements, crawl spaces and surrounding entry routes.
  • Match the treatment plan to the source condition, not just visible activity.
  • Document recommendations so prevention steps are clear after service.
Spider Control at Envexa

ENVEXA · GREATER CINCINNATI

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Behind this guide

Identification and pest-management references used for this guide. A close inspection may be needed to confirm a species.