Fig. 1 in Structure of the andropodium of the viviparous halfbeak genus Nomorhamphus (Atherinomorpha: Beloniformes: Zenarchopteridae), endemic to Sulawesi, Indonesia

Fig. 1. Andropodium of Nomorhamphus rex, ZFMK 44945, 35.0 mm SL, cleared and double stained. Scale bar = 1 mm. Abbreviations: gp, genital papilla; pt1, first anal pterygiophore; sn, spinae = spines; sp, spiculus; 1–5, anal-fin rays one to five. The elongate genital papilla (gp) covers the anterior part of the first anal-fin ray (1). Anal-fin rays one to five are modified and considered as andropodium. The second anal-fin ray (2) is most strongly modified with a terminal structure, the tridens flexibilis, consisting of a central spiculus (sp) and two lateral spines (sn). The physa is a pouch-shaped structure located between the third (3) and fourth fin ray (4). In the freshly fixed specimen, the andropodium is covered by a fleshy sheath, the cryptoplica.