Hemirrhagus akheronteus

It is found in Mexico, in the state of Queretaro, and is one of many Mexican cave tarantulas.

It is named after the latin word akheronteus, which means "pertaining to the stream of woe", referring to the acheron river in the infernal regions of Greek mythology.

[1] The tarantula's color is a solid grey or even black, making it blend in well with rocks.

Males have thornlike hairs on their legs, which are attached to a socket and are mobile.

This cave is found in the middle of the Sierra Gorda natural reserve.