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Siluriformes (Catfishes) >
Loricariidae (Armored catfishes) > Hypostominae
Etymology: Pseudacanthicus: Greek, pseudes = false + Greek, akantha = thorn (Ref. 45335); nyktos: Name 'nyktos' from the Greek word night in reference to the dark color of the specimen.
Milieu: milieu / Klimaatzone / Diepte / verspreidingsgebied
Ecologie
; zoet water demersaal. Tropical
South America: Brazil.
Grootte / Gewicht / Leeftijd
Maturiteit: Lm ?  range ? - ? cm
Korte beschrijving
Determinatiesleutels | Morfologie | Morfometrie
Dorsale zachte stralen (totaal) : 8; Anale zachte stralen: 5. This species is distinguished from its congeners by the following set of characters: dark brown to black body with light gray vermicular spots on the dorsal and ventral surfaces, and fins; lower mode number of teeth in premaxilla and dentary: 3 and 5, respectively; crown shaped anterior edge of supraoccipital with three tips, one larger central tip and two smaller lateral tips; thin and elongated nasal shape; absence of rectangular lateral ethmoid with lateral projection; anterior process of metapterygoid short and straight (Ref. 133457).
Body shape (shape guide): elongated; Cross section: flattened.
This species is found up to 20 meters deep in the main channel of rivers, commonly sheltering near submerged logs. In captivity, it exhibits a carnivorous diet, feeding mainly on small aquatic invertebrates. The species is notably territorial, often displaying intraspecific agression towards sympatric populations. During the reproductive period, males play an active role by confining females in burrows until egg-laying is complete (Ref. 133457).
Levenscyclus en paargedrag
Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven
Lopes, M.L.B.G., L.M.D. Sousa and C.C. Chamon, 2024. New species of Pseudacanthicus (Siluriformes: Loricariidae) from the rio Xingu, Amazon, Brazil. Neotrop. Ichthyol. 22(3):e240033. (Ref. 133457)
Status op de Rode Lijst van het IUCN (Ref. 130435: Version 2025-2 (Global))
Gevaar voor de mens
Harmless
Gebruik door de mens
Visserij: van geen belang
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Fylogenetische diversiteitsindex (Ref. 82804) |
PD50 = 0.5039 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.01549 (0.00729 - 0.03291), b=2.96 (2.79 - 3.13), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
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0 |
Weerstandsvermogen (Ref. 120179) |
laag, minimale populatieverdubbelingstijd 4,5-14 jaar (Preliminary K or Fecundity.). |
Kwetsbaarheid van de visserij (Ref. 59153) |
High vulnerability (61 of 100). 🛈 |