Classification / Names
Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa
Teleostei (teleosts) >
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.
Environment: milieu / climate zone / depth range / distribution range
Ecology
Freshwater; demersal. Tropical
South America: Brazil.
Size / Weight / Age
Maturity: Lm ? range ? - ? cm
Short description
Identification keys | Morphology | Morphometrics
Dorsal soft rays (total): 8; Anal soft rays: 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).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
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. Neotropical Ichthyology 22(3):e240033. (Ref. 133457)
IUCN Red List Status (Ref. 130435: Version 2025-1)
Threat to humans
Harmless
Human uses
Fisheries: of no interest
Tools
Special reports
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Internet sources
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5039 [Uniqueness, from 0.5 = low to 2.0 = high].
Resilience (Ref.
120179): Low, minimum population doubling time 4.5 - 14 years (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low to moderate vulnerability (29 of 100).
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