PhilodromusCespitum  (THOMISIDAE)

Philodromus cespitum

The genus Philodromus is a member of the Thomisidae, which includes Xysticus cristatus , for example. Unlike Xyticus sp. the members of genus Philodromus pursue their prey more actively, as opposed to lying in wait. To help with mobility, Philodromus sp. has tufts (scopulae) extending from the tarsal claw and over onto the metatarsus. The photo is of a male of the species.


Head and chelicerae of female Philodromus cespitum Epigyne (female sexual organ) of Philodromus cespitum Left Pedipalp (male sexual organ) of Philodromus cespitum, ventral view.

Spinnerets of a male Philodromus cespitum Tarsal claw of a female Philodromus cespitum. Note the scopula hairs below the visible claw, and compare this with the much reduced scopula on Xysticus cristatus Pedipalp of a female Philodromus cespitum. The single claw can just be made out among the scopula hairs to the left of the image, about 1/3rd of the way up.

Tarsus of a female Philodromus cespitum showing scopulae along its length Joint between tarsus (left) and metatarsus of Philodromus cespitum showing extent of scopulae