Opilio canestrinii is a species of harvestman.

Males reach a body length of up to 6 mm, females up to 8 mm. While males are yellowish brown to reddish, the color is lighter in females. Males have dark legs, but yellow coxa

Coxa

Coxa may refer to:* Theta Leonis, a star* Nickname of Brazilian soccer team Coritiba Foot Ball Club* Hip, below the lateral side of the abdomen* The short most-proximal base jointed segment of the arthropod leg...

e and "knees"; the legs of females show alternatingly light and dark rings. The back of females sports a dark saddle-like pattern with a light longitudinal stripe in the middle. Adults can be found from June up to December.

O. canestrinii probably originates from Italy

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

, but has invaded central Europe

Central Europe

Central Europe or alternatively Middle Europe is a region of the European continent lying between the variously defined areas of Eastern and Western Europe...

 since the late 1970 and has since almost everywhere replaced the similar O. parietinus

Opilio parietinus

Opilio parietinus is a species of harvestman. It is found in Europe and North America.It is similar to O. canestrinii, but has dark spots on its coxae, and is generally more of a grayish green color. Like O...

. It is most often found on house walls.