| Zenarchopteridae (Internally fertilized halfbeaks) |
| 4.3 cm SL (male/unsexed); 5.38 cm SL (female) |
|
pelagic; freshwater; depth range - 0 m |
| Asia: Sungai Wawolambo in Sulawesi Tenggara, Indonesia. |
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Dorsal soft rays (total): 11-13; Anal soft rays: 15-16; Vertebrae: 36-38. Nomorhamphus lanceolatus can be distinguished from all congeners by the combination of the following characters: lower jaw short; no fleshy lower jaw appendage in males; presence of black pigmentation in anal and dorsal fin; life coloration with yellow and orange colored anal, dorsal, and caudal fin, ventral surface of lower jaw orange and yellow belly; a lanceolate, dorsally slightly curved spiculus in the male andropodium, with the middle segments of the spiculus in contact with the distal tip of the third anal-fin ray; nine to ten segments proximal to spinae (mode nine segments); segments three or four to six or seven (mode four to seven) of second anal-fin ray in males with a dorsal and a ventral row of 'subsegments' forming small squares and rectangles of different sizes, so that these segments seem to be subdivided; third anal-fin ray slightly constricted longitudinally, giving the appearance of two distinct rays, distal part of this ray is slightly curved ventrally to contact spiculus (Ref. 97329). |
| Occurs in a stream of about 7-9 m wide and 50 cm deep, partially shaded by forest canopy, with a bed of sand and gravel (Ref. 97329). |
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Endangered (EN); Date assessed: 17 January 2020 (B1ab(iii)) Ref. (130435)
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| harmless |
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