Actinopteri (ray-finned fishes) > Siluriformes
(Catfishes) > Loricariidae
(Armored catfishes) > Hypostominae
Etymology: Ancistrus: Greek, agkistron = hook (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
Freshwater; demersal. Subtropical; 25°C - 28°C (Ref. 13614)
South America: Xingu and Tocantins River basins in Brazil.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 19.5 cm TL male/unsexed; (Ref. 111518); max. published weight: 153.67 g (Ref. 111518)
Inhabits clear running water, without a strong current to a depth of 3 meters during dry season. Prefers narrow cracks of submerged rocks, small passages between superimposed rocks, or lives below flat rocks on the bottom.
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Muller, S., L.H. Rapp Py-Daniel and J. Zuanon, 1994. Ancistrus ranunculus, a new species of loricariidae fish (Siluriformes: Loricariidae) from the Xingu and Tocantins rivers, Brazil. Ichthyol. Explor. Freshwat. 5(4):289-296. (Ref. 26707)
IUCN Red List Status (Ref. 123251)
CITES (Ref. 123416)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01479 (0.00786 - 0.02782), b=3.04 (2.88 - 3.20), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .