Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Siluriformes
(Catfish) > Aspredinidae
(Banjo catfishes) > Hoplomyzontinae
Etymology: Xyliphius: Greek, xylephion, xylarion = a little piece of wood (Ref. 45335); anachoretes: The specific name is from the Greek adjective anachoretes, which means 'one that retired from the world', hermit, recluse, in allusion to the rarity of the only two specimens known, each one found alone and far apart.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; demersal. Tropical
South America: rio Tocantins-Araguaia system in Brazil.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 8.8 cm SL male/unsexed; (Ref. 83904)
Morphology | Morphometrics
soft rays: 7;
Vertebrae: 31. Distinguished from other members of the genus Xyliphius, except Xyliphius magdalenae, by following characters: 6 developed retrorse serrae along posterior border of pectoral spine (vs. 7-9 in Xyliphius melanopterus and Xyliphius barbatus, 8 in Xyliphius lombarderoi, 8-10 in Xyliphius lepturus and Xyliphius kryptos). Differs from Xyliphius magdalenae by having 31 total free vertebrae (vs. 33-36). Can be further distinguished, except from Xyliphius kryptos, by papillae of lower lip bearing minute branches (vs. large branches in Xyliphius lepturus, Xyliphius barbatus, Xyliphius lombarderoi, and Xyliphius melanopterus, or unbranched papillae in Xyliphius magdalenae); and, except from Xyliphius magdalenae and Xyliphius kryptos, by having 22 or 24 papillae on lower lip (vs. 25-28 in Xyliphius lepturus, 27-29 in Xyliphius melanopterus, 27-30 in Xyliphius barbatus, and 28 in Xyliphius lombarderoi). Can be also promptly separated by the lower number of dorsal procurrent rays (2) from Xyliphius lepturus (2 or 5), Xyliphius melanopterus (3), and Xyliphius magdalenae (4) (Ref. 83904).
Found in shallow waters (Ref. 83904).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Figueiredo, C.A. and M.R. Britto, 2010. A new species of Xyliphius, a rarely sampled banjo catfish (Siluriformes: Aspredinidae) from the Rio Tocantins-Araguaia system. Neotrop. Ichthyol. 8(1):105-112. (Ref. 83904)
IUCN Red List Status (Ref. 119314)
CITES (Ref. 115941)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5078 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm Total Length, based on all LWR estimates for this body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.1 ±0.3 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
): High, minimum population doubling time less than 15 months ().
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .