Ituglanis passensis

Fernandez and Bichuette 2002



Trichomycterus sp.  Trajano 1997




Holotype: MCP 27382 62.6mm SL. Paratypes: MCP 12941 (3 specimens) 37.8 – 62.2mm SL, MFA-ZV 554-1 57.1mm SL, MFA-ZV 554-2 60.5mm SL.


Known only from the type locality: Passa Tres cave, Sao Domingos, Goias State, Brazil (13o36’S, 46o23’W). This species coexists within Passa Tres with Ancistrus cryptophthalmus (Loricariidae) and Eigenmannia vicentespelaea (Sternopygidae).


This species lives in small riffles with shallow water and slow current. It mostly hides in gravel on under stones. A mark-recapture study suggested a population size within Passa Tres of 530 (0.265 individuals m-2). This is quite a high population density (Trajano 2001 Table 2). (All details from Fernandez and Bichuette 2002)


Placed in the genus Ituglanis by the presence of three autapomorphies: 1. supraoccipital fontanel reduced to a small round opening, 2. palatine with a deep concavity on its medial margin, 3. anterior portion of sphenotic directed anteriorly. Relationships to congeners and other members of the family unknown.

Conservation Status

TLO [NE] [VU D2:3.1:2011]

Ituglanis passensis is endemic to Brazil, found in a single cave, Lapa do Passa Três of the São Vicente System, Paranã River basin, Alto Tocantins, São Domingos municipality, Goiás, inside the Terra Ronca State Park (PETER). Both the extent of occurrence and the area of ​​occupation are estimated at 2.3km2. Population studies estimated the adult population in 504 individuals. The river crosses an epigeal section before entering the underground environment (sink), passing through an area not yet indemnified of PETER, where there is intense occupation of cattle. The expansion of deforestation and the degradation of riparian forests can cause sedimentation of the river and consequent reduction of organic matter transport, reducing the food for the underground populations. Therefore, Ituglanis passensis was categorized as Vulnerable (VU) by the D1 and D2 criteria. It is necessary to regularize the area of ​​the park in that place, expropriating and compensating the residents for effective protection of the area. " [Google translate]

Museum Holdings

As above only.

Key References

Trajano, E. and de Souza, A. M. Journal Article 1994 Behaviour of Ancistrus cryptophthalmus an armoured blind catfish from caves of central Brazil, with notes on syntopic Trichomycterus sp. (Siluriformes, Loricariidae, Trichomycteridae)
Trajano, E. Journal Article 1997 Food and reproduction of Trichomycterus itacarambiensis, a cave catfish from south-eastern Brazil
Fernandez, L. and Bichuette, M.E. Journal Article 2002 A new cave dwelling species of Ituglanis from the Sao Domingos karst, central Brazil (Siluriformes: Trichomycteridae)
Bichuette, M.E. and Trajano, E Journal Article 2003 Epigean and subterranean ichthyofauna from the Sao Domingos karst area, Upper Tocantins River basin, central Brazil
Bichuette, M.E. Thesis 2003 Distribuicao, biologia, ecologia populacional e comportamento de peixes subterraneos, generos Ituglanis (Siluriformes: Trichomycteridae) e Eigenmannia (Gymnotiformes: Sternopygidae) da area carstica de Sao Domingos, nordeste de Goias
Bichuette, M.E. and Rizzato, P.P. Journal Article 2012 A new species if cave catfish from Brazil, Trichomycterus rubbioli sp. n., from Serra do Ramalho karstic area, Sao Francisco River basin, Bahia State (Siluriformes: Trichmycteridae)
Rizzato, P.P. and Bichuette, M.E. Journal Article 2014 Ituglanis boticario, a new troglomorphic catfish (Teleostei: Siluriformes: Trichomycteridae) from Mambai karst area, central Brazil
Datovo, A., Aquino P. de P.U. and Langeani, F. Journal Article 2016 A new species of Ituglanis (Siluriformes: Trichomycteridae) from the Tocantins and Paranaíba river basins, central Brazil, with remarks on the systematics of the genus
Rizzato, P.P. and Bichuette, M.E. Journal Article 2017 The laterosensory canal system in epigean and subterranean Ituglanis (Siluriformes: Trichomycteridae), with comments about troglomorphism and the phylogeny of the genus
Bichuette, M.E., Gimenez, E.A., Arnone, I.S. and Trajano, E. Journal Article 2018 An important site for conservation of bats in Brazil: Passa Três cave, São Domingos karst area, with an updated checklist for Distrito Federal (DF) and Goiás state
Bichuette, M.E., Simões, L.B., Zepon, T., von Schimonsky, D.M. and Gallão, J.E. Journal Article 2019 Richness and taxonomic distinctness of cave invertebrates from the northeastern state of Goiás, central Brazil: a vulnerable and singular area
Sampaio, F.A.C., Rufino, M.S., Pompeu, P.S., Santos, H.A. and Ferreira, R.L. Journal Article 2020 Hydraulic flow resistance of epigean and hypogean fish of the family Trichomycteridae (Ostariophysi, Siluriformes)
Bichuette, M.E. and Trajano, E. Journal Article 2021 Monitoring Brazilian cavefish: Ecology and conservation of four threatened catfish of genus Ituglanis (Siluriformes: Trichomycteridae) from central Brazil
Secutti, S. and Trajano, E. Journal Article 2021 Reproduction, development, asymmetry and late eye regression in the Brazilian cave catfish Ituglanis passensis (Siluriformes, Trichomycteridae): evidence contributing to the neutral mutation theory
Rizzato, P.P. and Bichuette, M.E. Journal Article 2024 Gross morphology of the brain and some sense organs of subterranean pencil catfishes of the genus Ituglanis Costa and Bockmann, 1993 (Siluriformes, Trichomycteridae), with a discussion on sensory compensation versus preadaptation in subterranean fishes