While not completely sure, it definitely looks like an Arachnid. Upon further research, I have narrowed it down to either Amblypygi (i.e., whips spiders, tailless whip scorpions), or Solifugae (i.e., camel spiders, wind scorpions, sun spiders). Using whatever perceptional abilities I have, I have made the educated guess that the appearance of the arthropod you posted most closely resembles that of Amblypygi.
The "antenna" is part of the anterior legs (first pair), and not an actual antenna. The other leg of the pair is missing. The appendages in the front that are long and folded are not legs, but pedipalps.