Pholcus phalangioides is pale yellow-brown except for a large gray patch in the center of the cephalothorax. The body and legs are almost translucent. These spiders are covered with fine gray hairs. The head is a darker color around the eyes. A translucent line marks the dorsal vessel. There are eight eyes: two small eyes in front of the two triads of larger eyes.
Females are seven to eight millimeters in length and males are six millimeters.
Because of the translucent quality of this animal, using a microscope it is possible to see the moving blood cells in the legs and body of a living animal.
Range length: 6 to 8 mm.
Other Physical Features: bilateral symmetry
Sexual Dimorphism: female larger