Carboniferous arachnid

The Carboniferous Arachnids were a species of Solifugae, a distinct arachnid order, from the Carboniferous period. They were not true spiders, but were still arachnids.

Characteristics
Carboniferous Arachnids were large invertebrates which could grow to over a meter long and wide. Carboniferous Arachnids possessed an anatomy closely resembling that of spiders, but they had large pincers in place of fangs, and apparently did not produce webbing or venom. The Arachnids nested in very large groups, and apparently had a siege mentality towards intruders in their territory - the Arachnids tended to react with aggression towards aforementioned intruders, and would use sheer numbers to fight off and overwhelm animals larger and stronger than themselves. Carboniferous Arachnids were sensitive to light, and therefore avoided and fled from it even in their own territory, and preferred dark and damp places.

Trivia
might even belong to that order, the Carboniferous arachnid could be identified as Protosolpuga carbonaria, a species of extinct Carboniferous solifugae.
 * Considering that the species is closely related to solifugae or