Taxonomic Remarks
See Géry, 1977:579 for comments and Bizerril, 1994:65 for key.
Milieu: milieu / Klimaatzone / Diepte / verspreidingsgebied
Ecologie
; zoet water benthopelagisch. Tropical
South America: coastal basins of southeastern Brazil.
Grootte / Gewicht / Leeftijd
Maturiteit: Lm ?  range ? - ? cm
Max length : 8.1 cm SL mannelijk / geslacht onbekend; (Ref. 38376); 10.4 cm SL (female)
Inhabits streams and rivers with sandy to muddy bottom. Forages during the day mingling with schools of similarly sized and looking prey types, such as tetras of the genus Astyanax, and feeds on their scales. The resemblance of this scale-eater with its habitual prey is an example of aggressive mimicry (Ref. 40388). The fish follows closely the intended prey by placing itself obliquely to its rear; strikes at prey's flank with its mouth widely open, the scales being removed during a quick bite. Removed scales are swallowed immediately and the predator resumes schooling with its prey. The fourth dentary teeth, the most important one for scale removal, is already differentiated in juveniles at 1.9 SL. The scale-eating habit may have a primarily social origin through inter-specific aggression. Besides scales, it occasionally takes insects, tiny crustaceans and plant material (Ref. 28733).
Levenscyclus en paargedrag
Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven
Terán, G.E., M.F. Benitez and J.M. Mirande, 2020. Opening the Trojan house: phylogeny of Astyanax, two genera and resurrection of Psalidodon (Teleostei: Characidae). Zool. J. Lin. Soc. 190(4):1217-1234. (Ref. 123753)
Status op de Rode Lijst van het IUCN (Ref. 130435: Version 2025-2 (Global))
Gevaar voor de mens
Harmless
Gebruik door de mens
Tools
Speciale rapporten
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Schattingen op basis van modellen
Fylogenetische diversiteitsindex (Ref. 82804) |
PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.01148 (0.00510 - 0.02587), b=3.05 (2.86 - 3.24), in cm total length, based on LWR estimates for this Genus-body shape (Ref. 93245). |
Trofisch niveau (Ref. 69278) |
3.2 ±0.49 se; based on food items. |
Weerstandsvermogen (Ref. 120179) |
Hoog, minimale populatieverdubbelingstijd minder dan 15 maanden (Preliminary K or Fecundity.). |
Kwetsbaarheid van de visserij (Ref. 59153) |
Low vulnerability (22 of 100). 🛈 |