Klassifizierung / Names
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Characiformes (Characins) >
Crenuchidae (South American darters) > Characidiinae
Etymology: Characidium: Diminutive of Charax, -akos = a fish without identification (Ref. 45335); jivaro: Name 'jivaro' in honor of the Jívaro indigenous people, the inhabitants of the type locality. A noun in apposition.
Umwelt: Milieu / Klimazone / Tiefenbereich / Verbreitungsgebiet
Ökologie
; süßwasser benthopelagisch. Tropical
South America: Peru.
Größe / Gewicht / Alter
Geschlechtsreife: Lm ?  range ? - ? cm
Max length : 3.6 cm SL Männchen/unbestimmt; (Ref. 138327)
Kurzbeschreibung
Bestimmungsschlüssel | Morphologie | Morphometrie
Rückenflossenweichstrahlen (insgesamt) : 9; Afterflossenweichstrahlen: 6; Wirbelzahl: 33 - 35. This species is distinguished from its congeners by the following set of characters: black longitudinal band that extends along the total length of the paired fins, from the base to tip of the third unbranched and first branched rays on pectorals and first two branched rays on the pelvic fins; bony processes along length of the pectoral-fin rays, dorsally positioned, on mature and immature females and males; teeth on the premaxilla and dentary strongly tricuspid, with three well developed and similar sized cusps; completely perforated lateral-line scales; lack of a conspicuous dark narrow stripe extending from rear of opercle to end of caudal peduncle; lack of 13 or more thin conspicuous black bars from dorsum to ventral portion of body; lack of dark blotches on opercle and preopercle; remnants of bars in maturing and matures specimens slightly concave anteriorly; four series of scales above the lateral line and three or four from the lateral line to the pelvic-fin insertion; and lack of dark spots on the caudal fin (Ref. 138327).
Body shape (shape guide): elongated; Cross section: oval.
Lebenszyklus und Paarungsverhalten
Geschlechtsreife | Fortpflanzung | Ablaichen | Eier | Fruchtbarkeit | Larven
Zanata, A.M., R. Britzke, V. Meza-Vargas, M.H. Hidalgo, D. Faustino-Fuster and L. Oliveira-Silva, 2025. A remarkable new Characidium (Characiformes: Crenuchidae) from tributaries of río Marañón, Loreto, Peru, with unique fin bony processes in both sexes. Neotrop. Ichthyol. 23(3):e250047. (Ref. 138327)
IUCN Rote Liste Status (Ref. 130435: Version 2025-2 (Global))
Bedrohung für Menschen
Harmless
Nutzung durch Menschen
Fischereien: nicht kommerziell
Tools
Zusatzinformationen
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Internet Quellen
Schätzungen auf der Grundlage von Modellen
Phylogenetischer Diversitätsindex (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01023 (0.00452 - 0.02316), b=3.07 (2.89 - 3.25), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Trophische Ebene (Ref.
69278): 3.3 ±0.3 se; based on size and trophs of closest relatives
Anfälligkeit der Fischerei (Ref.
59153): Low vulnerability (10 of 100).
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