分類 / Names
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Characiformes (Characins) >
Crenuchidae (South American darters) > Characidiinae
Etymology: Characidium: Diminutive of Charax, -akos = a fish without identification (Ref. 45335); xavante: Named for its type locality, Córrego Xavante. Xavante refers to the indigenous Brazilian ethnic group, inhabiting the region between the Rio das Mortes and Rio Culuene, Mato Grosso; also the stream at the type locality is named after this ethnic group..
Environment: milieu / climate zone / depth range / distribution range
生態学
; 新鮮な水 底生の漂泳性. Tropical
South America: Rio Culuene watershed, upper Rio Xingu drainage in Brazil.
サイズ / 重さ / 年齢
Maturity: Lm ? range ? - ? cm
Max length : 2.8 cm SL オス/雌雄の選別がない; (Ref. 75787)
簡単な記述
検索表 | 形態学 | 形態計測学
背鰭 (合計) : 12 - 13; 臀鰭: 9 - 10; 脊つい: 32 - 33. Belongs to a group of species, including Characidium nupelia, distinguished uniquely by having high number (12-18) of dark vertical bars on the body, each bar having the width of a scale. Diagnosed by a lower number of scales around the caudal peduncle (10 vs. 12 or more in most Characidium species). Differs from Characidium nupelia by its wider interorbital region (interorbital distance 30.1-38.0 vs. 20.5-28.6% HL) and lower caudal peduncle (caudal peduncle depth 35.4-44.9 vs. 46.2-57.8% HL). Additional conspicuous external characters that are not unique but are helpful in the identification of this species include absence of adipose fin, incomplete lateral line, and presence of a dark blotch on the caudal peduncle (Ref. 75787).
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 幼生
da Graça, W.F., C.S. Pavanelli and P.A. Buckup, 2008. Two new species of Characidium (Characiformes: crenuchidae) from Paraguay and Xingu River Basins, State of Mato Grosso, Brazil. Copeia 2008(2):326-332. (Ref. 75787)
Human uses
用具
特記事項
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インターネットの情報源
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01023 (0.00434 - 0.02412), b=3.05 (2.86 - 3.24), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
栄養段階 (Ref.
69278): 3.2 ±0.3 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
