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Characiformes (Characins) >
Characidae (Characins; tetras) > Stethaprioninae
Etymology: Hyphessobrycon: Greek, hyphesson, -on, -on = a little smaller + Greek, bryko = to bite (Ref. 45335); myrmex: Name from Greek word for ant, referring to the small size of adult specimens of the species and also refers to the type locality, the Rio Formiga, which means ‘Ant River’ in Portuguese..
Environment: milieu / climate zone / depth range / distribution range
生態学
; 新鮮な水 底生の漂泳性. Tropical
South America: Brzail.
サイズ / 重さ / 年齢
Maturity: Lm ? range ? - ? cm
Max length : 2.4 cm SL オス/雌雄の選別がない; (Ref. 128641)
簡単な記述
形態学 | 形態計測学
This species is distinguished from all its congeners, except Hyphessobrycon agulha, H. clavatus, H. herbertaxelrodi, H. klausanni, H. loretoensis, H. lucenorum, H. margitae, H. metae, H. mutabilis, H. peruvianus, H. wadai, by having the lower half of body deeply pigmented with dark chromatophores, mainly above the anal fin, forming a broad, diffuse, dark midlateral stripe (vs. no longitudinal stripe, narrow stripe starting approximately at vertical through the dorsal-fin origin, or relatively narrow, well-defined, dark midlateral stripe on body extending from the posterior margin of the eye to the middle caudal-fin rays); with high concentration of dark chromatophores along unbranched dorsal-fin rays and distal portions of the two or three subsequent branched rays (vs. dark chromatophores absent or, when present, only scattered on fin) (Ref. 128641).
Found where water is transparent and the river bottom is composed of stones, sand and a moderate amount of vegetal debris. The type locality which is a hydroelectric reservoir (PCH Divisa) built in 2010 in the Rio Formiga, occupy an area of 6·8 km2. Before the dam was built, this place would have resembled the adjacent up and downstream areas of the river, i.e. a relative narrow (10–15 m wide) and shallow (maximum depth approximately 1·8 m in some sites) river stretch, with rapid waters and rifles. Stomach contents revealed a diet based on filamentous algae (c. 10%), vascular plant tissue (c. 6%), microcrustaceans (c. 10%), Chironomidae larvae (c. 10%) and Ephemeroptera nymphs (c. 64%). It may be considered an omnivorous species based on the main food resources exploited, but may have tendency toward invertivory. Approximately 50% of the analysed specimens had parasitic isopods (Cymothoidae) associated with the tongue. Specimens with this parasites exhibited a bag-shaped lower jaw, tongue atrophy and softening of the cartilaginous tissues (Ref. 128641).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Pastana, M.N.L. and F.C.P., Esguicero, A.L.H. Dagosta, 2017. A new sexually dichromatic miniature Hyphessobrycon (Teleostei: Characiformes: Characidae) from the Rio Formiga, upper Rio Juruena basin, Mato Grosso, Brazil, with a review of sexual dichromatism in Characiformes. J. Fish Biol. 91(5):1-18 [1301-1318].
[Published online 14 Sept. 2017. Volume and pages added later.] (Ref. 128641)
Human uses
より多くの情報
共通名の類義語代謝捕食動物生態毒性繁殖成熟放精卵の集合体生産力卵卵の開発
Age/Size成長体長-重さLength-length体長組成形態計測学形態学幼生幼生の動力補充豊度BRUVS
参考文献水産養殖水産養殖の紹介緊張遺伝子のElectrophoreses遺伝病気行列NutrientsMass conversion
協力者画像Stamps, Coins Misc.音シガテラ（食中毒の名前）速度泳ぐ 型式カマOtoliths脳視覚
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 = No PD50 data [Uniqueness, from 0.5 = low to 2.0 = high].
栄養段階 (Ref.
69278): 3.0 ±0.23 se; based on food items.
回復力 (Ref.
120179): 高い, １５か月以下の倍増期間の最小個体群 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
