Aphonopelma chamberlini, also known as the Paso Robles rusty red tarantula, is regarded by some sources as a tarantula species endemic to California,[3] and by others as synonymous with Aphonopelma iodius.

[1][2] Described in 1995, it is known from the vicinity of Paso Robles, California.

Females are around 66 mm (2.6 in) long, and the body color is a uniform reddish brown with light rusty red setae (hairs) on the legs.

The species name honors arachnologist Ralph Vary Chamberlin, who was responsible for naming a large number of Aphonopelma species.

[3] A 2013 study suggested A. chamberlini was synonymous with Aphonopelma brunnius,[4] which has since been included in Aphonopelma iodius.