Fig. 1. Spiny lobster and antennular sensilla. (A) Diagram of the spiny lobster showing the major components of the chemosensory system. (B) High-magnification scanning electron micrograph of a portion of the aesthetasc tuft region of the lateral flagellum. Aesthetasc (a), guard (g), companion (c) and asymmetric sensilla (as) are visible. (C) Scanning electron micrograph of a portion of the medial flagellum showing various types of non-aesthetasc sensilla. (D–F) High-resolution scanning electron micrographs of three bimodal chemo-mechanosensilla: (D) hooded sensillum, (E) medium simple sensillum and (F) long simple sensillum. Modified from Cate and Derby (2001).