Nomorhamphus celebensis

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 : 254

Nomorhamphus celebensis , N. kolonodalensis , & N. towoetii

( Fig. 6B, D )

Pigmentation. Cryptoplica and fin rays slightly or not pigmented. N. celebensis : anal fin completely dusky and without distinctly black tips, higher concentration of melanophores compared to N. kolonodalensis . N. kolonodalensis : distal tips of anal-fin rays distinctly black; in smaller males only dorsal tips, in larger males dorsal 2/3. N. towoetii : distal tips of anal-fin rays with diffuse grey or black pigmentation or anal-fin completely dusky.

Andropodium. 1 st anal pterygiophore thickened, not angled anteriorly. 2 nd fin ray with 9/10–11 segments proximal to spinae. N. kolonodalensis : segments 7–8 in some specimens with dorsal and ventral row of irregular sub-segments (≥ 1, squares, rectangles), each segment approximately 1/3 the height of segment 7 or 8; spiculus only segmented at proximal end ( N. celebensis ) or spiculus clearly segmented ( N. kolonodalensis ), dorsal portion slightly curved or straight, not thickened, elongate in large males, not in contact to tip of 3 rd anal fin ray. 3 rd fin ray with segments 3/4–5/6/7 composed of three longitudinal rows, each row approximately 1/3 the height of the respective segment; tip of ray 3 nearly straight, parallel to spiculus. 4 th fin ray: N. kolonodalensis : distal half thin and dorsal portion curved; segments 5–6/7 composed of three longitudinal rows, each row approximately 1/3 the height of the respective segment. 5 th fin ray with segments 2–4 slightly thickened in N. celebensis , not thickened in N. kolonodalensis and N. towoetii .

Figures

Fig. 6. A, B, Diagrammatic representation of andropodium of (A) Nomorhamphus rex,ZFMK 44945, 35.0 mm SL and (B) N. kolonodalensis, ZFMK 49103, 40.3 mm SL. C, D, Rendered image of andropodium of (C) N. rex, ZFMK 44944, 41.2 mm SL and (D) N. kolonodalensis. Scale bar = 1 mm. Bone stippled. Arrowheads point (A) to the elongate fourth segment of the second anal-fin ray and to the characteristic, sickle-shaped spiculus of N. rex and (B) to the thin, elongate spiculus of N. kolonodalensis.