Fig. 1. (A) Face-on view of a spiny lobster, Panulirus argus. The arrows point to the lateral flagellum of the antennule bearing rows of aesthetascs. (B) Scanning electron micrograph (SEM) of a three-quarter view of a P. argus antennule, showing (1) aesthetascs, (2) mechanosensory hairs and (3) guard hairs. The guard hairs on the left side of the image were removed to show the zig-zag pattern of the tips of the aesthetascs. The aesthetascs and guard hairs line the ventral side of the lateral flagellum. (C) Side view SEM of a lateral flagellum of an antennule. (SEM photos by J. A. Goldman.)