Duct measurements

Mean length, mean internal diameter and mean thickness of the cuticle of a typical cribellar silk extrusion duct were measured in Photoshop CS2

VideoS1

For the assessment of the hackling speed of Uloborus plumipes, the spider was recorded with a Canon 5D Mark III in full HD (1920 x 1080) using LED-lamps (Dedolight Ledzilla)