Acantherpestes

Acantherpestes is an extinct genus of euphoberiid millipedes from the Pennsylvanian subperiod of the Carboniferous period. It is distinguished from other euphoberiids by its stout, laterally-directed spikes, which are curved backwards and bear an anterior ridge. It is known from the Mazon Creek [fossil beds] in Illinois.
Acantherpestes was a relatively large millipede, about to long. Paleoentomologist J.J. Burke speculated that Acantherpestes could have lived in open habitats adjacent to coal swamp forests, and that it was possibly carnivorous, but later authors have rejected the latter proposal.