. Bulletin of the Natural History Museum Zoology. Fig. 2 Schematic representation of the melanophore pattern of Sundasalanx in ventral view (anterior to left); A = gular streak of midventral line, B = midventral line of the ventral fin fold, C = myotomal line, D = melanophores of cleithral mark associated with the sternohyoideus. E = cardiac compartment melanophores (present only in males of 5. microps, S. mesops, S. megalops. and 5. platyrhynchus), F = basipterygium melanophore (present in all species examined). praecox. Males of S. malleti with mature, or maturing, testes show additional pig
. Bulletin of the Natural History Museum Zoology. Fig. 2 Schematic representation of the melanophore pattern of Sundasalanx in ventral view (anterior to left); A = gular streak of midventral line, B = midventral line of the ventral fin fold, C = myotomal line, D = melanophores of cleithral mark associated with the sternohyoideus. E = cardiac compartment melanophores (present only in males of 5. microps, S. mesops, S. megalops. and 5. platyrhynchus), F = basipterygium melanophore (present in all species examined). praecox. Males of S. malleti with mature, or maturing, testes show additional pigmentation of the pelvic-fin girdle, with a ring of melanophores encircling the basipterygium. The lower caudal-fin lobe is marked by a broad swath of melanophores in all species except possibly 5. praecox. This lower caudal-fin lobe swath is especially intense in materials identifiable as male (Fig. 14). A few scattered melanophores were observed on the upper caudal-fin lobe of a few individuals. The posterior half of the compartment in which the heart lies is marked with melanophores (Fig. 2) in males of S. microps, S. mesops, S. megalops, and S. platyrhynchus, even in quite small individuals. Examination of larger specimens in which it is obvious that maturation of the testes has begun shows the mark is present only in males; specimens with maturing or mature ovaries lack the mark, as do all of the smallest specimens. The juxtaposition of the anterior end of the myotomal lines to the pigmentation of the cardiac compartment creates a very distinctive M-shaped ventral mark just posterior to the pectoral girdle in males of those species with cardiac compartment pigmentation (Fig. 2). Soft anatomy Gut The gut of Sundasalanx is straight, with three sections clearly distinguishable under gross microscopical examination of cleared and stained specimens (Fig. 3). Length of gut measures approxi- mately 62% of SL in the largest cleared and stained specimen examined (24 mm SL).The first
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