| Rivulidae (Rivulines), subfamily: Rivulinae |
| 3 cm SL (male/unsexed); 2.74 cm SL (female) |
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benthopelagic; freshwater |
| South America: middle section of the Rio Aporé drainage, upper Rio Paraná Basin in Brazil. |
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Dorsal soft rays (total): 9-11; Anal soft rays: 13-15; Vertebrae: 30-31. Melanorivulus proximus can be diagnosed from all other species of the M. pictus group except M. scalaris by having irregularly arranged, interconnected oblique red bars on flank, forming Y- and X-shaped marks. It differs from M. scalaris by the following characters: females with caudal fin base colour pale orangish pink (vs. pale yellow); males with dorsal and anal fin sharply pointed (vs. rounded to moderately pointed); origin of dorsal fin at vertical between base of 9th and 10th (vs. between base of 7th and 8th); 29-30 longitudinal series of scales (vs. 31-34); pre-dorsal length longer in males (75.9-78.4 % SL vs. 73.0-75.0 % SL); anal-fin base longer (21.1-24.7 % SL in males and 18.8-21.4 % SL in females vs. 18.1-21.0 % SL in males and 16.2-18.5 % SL in females); and 9-10 infraorbital neuromasts around orbit (vs. 11-12) (Ref. 116860). |
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Not Evaluated (N.E.) Ref. (130435)
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| harmless |
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