Nomorhamphus ebrardtii

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 : 251

Nomorhamphus ebrardtii , N. lanceolatus , & N. sagittarius

( Fig. 4 )

Pigmentation. Lack of black pigment at posterior anal fin rays, cryptoplica and fin rays with few and small melanophores.

Andropodium. 1 st anal pterygiophore thickened, not angled anteriorly. 2 nd fin ray with 9–10 (7–10 in N. sagittarius ) segments proximal to spinae; segments 3/4–6/7/8 with a dorsal and ventral row of differently sized sub-segments (squares, rectangles), each sub-segment approximately 1/3 the height of the respective segment; segments 4–5 elongate in large males; spiculus lanceolate, clearly segmented at proximal end, ventrally slightly curved, pointed dorsally at an angle of 45°, distal tips (middle segments in N. lanceolatus and N. sagittarius ) of spiculus and 3 rd fin ray in contact. 3 rd fin ray slightly constricted longitudinally; segments 2–3 or 3–5 composed of three longitudinal rows, each row approx. 1/3 the height of the respective segment. 4 th fin ray with distal half of segment 1 thickened; distal half of ray slightly constricted longitudinally; segments 4–5/6/7 elongate and composed of three longitudinal rows, each row approximately 1/3 the height of the respective segment. 5 th fin ray not noticeably thickened ( N. ebrardtii ) or segments 2–5 thickened, ( N. lanceolatus , N. sagittarius ).

Figures

Fig. 4. A, B, Diagrammatic representation of andropodium of (A) Nomorhamphus ebrardtii, ZFMK 49156–49176, 40.0 mm SL and (B) N. sagittarius, MZB 20443, 35.2 mm SL. C, D, rendered image of andropodium of (C) N. ebrardtii and (D) N. sagittarius, WFB 3129, 39.3 mm SL. Scale bar = 1 mm. Bone stippled. Arrowheads point to spiculi of N. ebrardtii (A) and N. sagittarius (B), which contact the third anal-fin ray and differ in length.