Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Siluriformes
(Catfish) > Trichomycteridae
(Pencil or parasitic catfishes) > Trichomycterinae
Etymology: Trichomycterus: Greek, thrix = hair + Greek, mykter, -eros = nose (Ref. 45335); igobi: The specific name is based on a mythological character of the Tupi-Guarani Indian legend about the origin of the Iguaçu waterfalls.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; demersal. Tropical
South America: Lower rio Jordão of the rio Iguaçu, rio Paraná drainage in Brazil.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 9.0 cm SL male/unsexed; (Ref. 75005)
Morphology | Morphometrics
soft rays: 6 - 7;
Vertebrae: 37. Differs from its congeners by having large head 23.8-26.8% SL, which is proportionally the largest head in any Trichomycteridae. Additional diagnostic characters that distinguished this species from most or all of its congeners are the following: almost entirely cartilaginous second hypobranchial (with only vestigial ossification; mesially expanded palatine ossification; narrow and falciform cleithrum; absence of a proximal posterior concavity on the third ceratobranchial. Can be further distinguished from all congeners, except Trichomycterus stawiarski and T. sp. C, by having rigid spine-like morphology of individual procurrent rays of the caudal fin, extension of the dorsal caudal-fin procurrent rays series (extending for ten neural spine tips), and presence of ten or eleven branchiostegal rays. Dorsal fin situated on a concavity on dorsal profile of trunk, short caudal peduncle (15.4-19.7% SL) and first anal-fin ray base posterior to the vertical through the base of the last dorsal-fin ray are other useful characters for identification shared with various other species of Trichomycterus (Ref. 75005).
Feeds on larvae of Diptera (Simulidae), Ephemeroptera and Trichoptera, indicating benthic feeding habits (Ref. 75005).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Wosiacki, W.B. and M. de Pinna, 2008. Trichomycterus igobi, a new catfish species from the Rio Iguaçu drainage: the largest head in Trichomycteridae (Siluriformes: Trichomycteridae). Neotrop. Ichthyol. 6(1):17-23. (Ref. 75005)
IUCN Red List Status (Ref. 115185)
CITES (Ref. 115941)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00794 (0.00301 - 0.02096), b=2.98 (2.75 - 3.21), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.2 ±0.4 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) .