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Siluriformes (Catfishes) >
Loricariidae (Armored catfishes) > Hypostominae
Etymology: Ancistrus: Greek, agkistron = hook (Ref. 45335); megacanthus: Name 'megacanthus' from the Greek words 'megas' and 'akanthos', meaning 'large, great' and 'thorn, spine', referring to the large pectoral-fin spines of the new species. A noun in apposition.
Ambiente: milieu / zona climatica / distribuzione batimetrica / gamma di distribuzione
Ecologia
; acqua dolce demersale. Tropical
South America: Brazil.
Dimensione / Peso / Età
Maturità: Lm ?  range ? - ? cm
Max length : 12.4 cm SL maschio/sesso non determinato; (Ref. 132443)
Breve descrizione
Chiavi di identificazione | Morfologia | Morfometria
Spine dorsali (totale) : 2; Raggi dorsali molli (totale) : 7; Raggi anali molli: 4. This species is distinguished by the following set of characters: well developed snout tentacles, pectoral-fin spine long, and exceeding half length of the pelvic-fin leading ray in males; dorsal and caudal fins plain dark brown to black, without lighter spots or bands; dark brown to black background body color; small white to yellow dots on dorsal surface; four branched rays on the anal fin (Ref. 132443).
Body shape (shape guide): elongated; Cross section: flattened.
Facultative or obligate air-breathing ; The species inhabits creeks at elevations near 100 meters, with swift waters lined with rocks and gravel. These water bodies are located within the Pampa biome, in a savanna landscape dominated by herbaceous vegetation. Trees primarily confined to riverbanks with soils composed of clay and gravel (Ref. 132443).
Ciclo vitale e comportamento di accoppiamento
Maturità | Riproduzione | Deposizione | Uova | Fecondità | Larve
Widholzer, R.L., J. Borsoi, R.E. Reis and A.P. Lehmann, 2024. A new species of Ancistrus (Siluriformes: Loricariidae), with a redescription of Ancistrus brevipinnis and further evidence of hidden diversity in the laguna dos Patos system, Brazil. Neotrop. Ichthyol. 21(4):e230078. (Ref. 132443)
Stato della Lista Rossa IUCN (Ref. 130435: Version 2025-2 (Global))
Minaccia per l'uomo
Harmless
Usi umani
Pesca: di nessun interesse
Strumenti
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Stime basate su modelli
Indice di diversità filogenetica (Fonte Biblio.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01479 (0.00636 - 0.03440), b=2.98 (2.80 - 3.16), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Resilienza (Fonte Biblio.
120179): Medio, tempo minimo di raddoppiamento della popolazione 1.4 - 4.4 anni (Preliminary K or Fecundity.).
Vulnerabilità della pesca (Ref.
59153): Low vulnerability (10 of 100).
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