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Fig. 1. Schematic representation of the Cancer productus stomatogastric nervous system (STNS), showing the distribution of tachykinin-related peptide (TRP)-immunopositive structures, including the anterior commissural organs (ACOs). The STNS of the crab C. productus consists of four ganglia as well as a number of interconnecting and motor nerves. The four ganglia are the paired commissural ganglia (CoGs), the single oesophageal ganglion (OG) and the single stomatogastric ganglion (STG). The inferior oesophageal (ion), oesophageal (on), superior oesophageal (son) and stomatogastric (stn) nerves link these ganglia, while motor nerves, including the labral (ln), dorsal posterior oesophageal (dpon), anterior cardiac (acn), anterior lateral (aln), medial ventricular (mvn) and dorsal ventricular (dvn) nerves, provide innervation to the foregut musculature. The inferior ventricular nerve (ivn) and the circumoesophageal connectives (cocs) link the STNS with the supraoesophageal (SoG) and fused thoracic ganglia (TG), respectively. The distribution of TRP immunoreactivity in the STNS of C. productus is shown in red. Here, immunopositive somata are schematized with filled circles, while axons within nerves are represented by thick lines, and immunopositive neuropil by tangles of thinner lines. The locations of the left and right anterior commissural organs (ACO_L and ACO_R) are indicated with arrows. The nomenclature of ganglia and nerves is per Maynard and Dando (1974).

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