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分類 / 名稱 俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa
Teleostei > Characiformes (Characins) > Acestrorhamphidae (American tetras) > Pristellinae
Etymology: Hemigrammus:Greek, hemi = half + Greek, gramma = letter, signal (Ref. 45335); arua:Named for its type locality, lago São Francisco do Alto Aruã, A noun in apposition.
South America: headwaters of the rio Arapiuns, rio Tapajós basin, and from the adjacent headwaters of the igarapé Juruti Grande, rio Amazonas in Brazil.
大小 / 重量 / 年齡
成熟度: Lm? range ? - ? cm Max length : 3.0 cm SL 雄魚/尚未辨別雌雄; (Ref. 81198)
背的軟條 (總數) : 11 - 12; 臀鰭軟條: 21 - 25; 脊椎骨: 31. Distinguished from all species of the genus, except Hemigrammus stictus (Durbin), by having a large single humeral spot situated from fifth-sixth to posterior margin of eighth-tenth lateral line scales. Differs from Hemigrammus stictus by having a humeral spot roughly rectangular, higher than wide, with a pronounced upper, anteriorly-oriented extension,
conferring an inverted-comma shape to the blotch (vs. humeral spot roughly rounded, not presenting an inverted-comma shape), and life color pattern presenting unpaired fins orange reddish (vs. caudal fin and caudal peduncle bright red in life, remaining fins translucent) (Ref. 81198).
Body shape (shape guide): short and / or deep.
Inhabits shallow marginal areas, with abundant aquatic macrophytes, both emergent and non-emergent (Ref. 81198). Gut contents of four specimens include insect larvae, winged insects and plant matter (Ref. 81198).
Lima, F.C.T., W.B. Wosiacki and C.S. Ramos, 2009. Hemigrammus arua, a new species of characid (Characiformes: Characidae) from the lower Amazon, Brazil. Neotrop. Ichthyol. 7(2):153-160. (Ref. 81198)
