The second somite of the body (at the same time the second cephalon somite). It carries the antennulae. Sometimes the dorsal surface of the antennular somite is visible in front of the carapace and between the bases of the antennae as a triangular plate, the so-called antennular plate, which in Palinuridae may be armed with dorsal spines or spinules, and which in some genera has the lateral margins swollen and forming part of a stridulating organ. The antennular plate sometimes is referred to as antennal plate or inter-antennal plate.