Female P. murinus can grow to 4–6 inches in size (measured from the tip of the front left leg, to the rear right leg), while males typically range from 3–4 inches. The spider's abdomen, carapace, and legs have the same basic coloration, though the legs typically have brightly colored rings. The carapace has a star-shaped pattern, with a fishbone pattern present on the abdomen. The eyes are clustered together on a raised part of the carapace (in common with all tarantulas). The body is covered with short hairs, with longer hair present on the legs. There are currently 4 known colour variants of Pterinochilus murinus: TCF – typical colour form, UMV – Usambara Mountain variant, RCF – red colour form, DCF – dark colour form. These colour variants are found in different geographical locations, and the colouration is thought to be related to the type of soil present where each variant lives.
