Bug FAQCanestrini's Harvestman
Opilio canestrinii · Order: Opiliones · Family: Phalangiidae
Males grow up to about 6 mm and are yellow-brown to reddish, while females can reach 8 mm and are lighter in colour. They are most often found on house walls from June through December. The species probably originated in Italy.
Source: Wikipedia
How to recognize it
Males have dark legs with yellow coxae and knee areas, while females show alternating light and dark rings on their legs and a dark saddle-shaped pattern with a light stripe down the back.
Source: Wikipedia
Size
Males reach up to 6 mm in body length and females up to 8 mm.
Source: Wikipedia
Where it lives
They are most often found on house walls.
Source: Wikipedia
When you see it
Adults are present from June to December.
Source: Wikipedia
Where it comes from
Opilio canestrinii probably originates from Italy.
Source: Wikipedia
Where it is found in the US
Recorded in 1 of 51 states and DC. Most records: Washington.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: introduced in North America; introduced in Canada; introduced in United States. Source: iNaturalist
More photos
Questions people ask
Same family (Phalangiidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Opilio_canestrinii
Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia
Text written 2026-10-24 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-22.