Nomorhamphus brembachi

Kraemer, Janina, Thieme, Philipp, Hadiaty, Renny Kurnia & Herder, Fabian, 2019, Structure of the andropodium of the viviparous halfbeak genus Nomorhamphus (Atherinomorpha: Beloniformes: Zenarchopteridae), endemic to Sulawesi, Indonesia, Raffles Bulletin of Zoology 67, pp. 247-259 : 250

Nomorhamphus brembachi & N. liemi

( Fig. 3 )

Pigmentation. N. brembachi : Posterior half of fin with black or brown pigment. N. liemi: Larger concentration of melanophores, anal fin completely black in many males. Both species: cryptoplica and base of fin rays hardly pigmented.

Andropodium. 1 st anal pterygiophore thickened, not angled anteriorly. 2 nd fin ray with 10–11 segments proximal to paired spinae; segments 2/3–10/11 with longitudinal groove in the middle separating these segments into dorsal and ventral part ( N. brembachi ), with or without three distinct longitudinal rows ( N. liemi ) without further sub-segments; segment 4/5 or both elongate; spiculus straight, clearly segmented at proximal end, broad tip, distal tip not in contact with tip of third fin ray; distal half of second fin ray curved dorsally with tip pointing ventrally. Some specimens of N. liemi with small geniculus at proximal half of segment 4. 3 rd fin ray with segments 3–6 composed of three longitudinal rows, each row approximately 1/3 the height of the respective segment; segments 7 to tip short, tip straight. 4 th fin ray with segments 4–5 exhibiting longitudinal groove in the middle separating these segments into dorsal and ventral part ( N. brembachi ) or composed of three longitudinal rows ( N. liemi ); segments 6–7/8 composed of three longitudinal rows, each row approximately 1/3 the height of the respective segment; following segments short. 5 th fin ray with segments 2–4 thickened, shortened, approx. half the length of 4 th fin ray.

Figures

Fig. 3. A, B, diagrammatic representation of andropodium of (A) Nomorhamphus brembachi, ZMH 7616, 50.5 mm SL and (B) N. liemi, ZMH 7157, 36.6 mm SL. C, D, rendered image of andropodium of (C) N. brembachi, MZB 14450, 46.0 mm SL and (D) N. liemi, MZB 14473, 41.1 mm SL. Scale bar = 1 mm. Bone stippled. Arrowheads point (A) to sub-segments of second fin ray of N. brembachi and (B) to “geniculus” of N. liemi.