The currently existing subphylums of the Phylum Arthropoda are, Chelicerata and the Mandibulata. The characteristic of mandibulata is having one or more pairs of antennae and the mandibles. Mandibles serve as the grinding mouthparts. In contrast, the Chelicerata (consists of arachnids and horseshoe crabs) contains no antennae and mandibles but contains mouth parts that are of pincher-like. Solution The currently existing subphylums of the Phylum Arthropoda are, Chelicerata and the Mandibulata. The characteristic of mandibulata is having one or more pairs of antennae and the mandibles. Mandibles serve as the grinding mouthparts. In contrast, the Chelicerata (consists of arachnids and horseshoe crabs) contains no antennae and mandibles but contains mouth parts that are of pincher-like..