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• 
  Species: Liobagrus marginatus
  Caption: Albino - close-up of head
• 
  Species: Malapterurus electricus
  Caption: Albino - close-up of head
• 
  Species: Synodontis soloni
  Caption: Albino - close-up of head
• 
  Species: Bagrichthys hypselopterus
  Caption: Albino, close-up of head
• 
  Species: Acrochordonichthys ischnosoma
  Caption: Close-up of head
• 
  Species: Acrochordonichthys strigosus
  Caption: Close-up of head
• 
  Species: Akysis prashadi
  Caption: Close-up of head
• 
  Species: Akysis prashadi
  Caption: Close-up of head
• 
  Species: Akysis recavus
  Caption: Close-up of head
• 
  Species: Akysis vespa
  Caption: Close-up of head
• 
  Species: Parakysis anomalopteryx
  Caption: Close-up of head
• 
  Species: Parakysis grandis
  Caption: Close-up of head
• 
  Species: Parakysis notialis
  Caption: Close-up of head
• 
  Species: Parakysis verrucosus
  Caption: Close-up of head
• 
  Species: Amblyceps cerinum
  Caption: Close-up of head
• 
  Species: Belonoglanis brieni
  Caption: Close-up of head
• 
  Species: Trachyglanis ineac
  Caption: Close-up of head
• 
  Species: Ariopsis felis
  Caption: Close-up of head
• 
  Species: Bagre marinus
  Caption: Close-up of head
• 
  Species: Bunocephalus coracoideus
  Caption: Close-up of head
• 
  Species: Bunocephalus verrucosus
  Caption: Close-up of head
• 
  Species: Platystacus cotylephorus
  Caption: Close-up of head
• 
  Species: Platystacus cotylephorus
  Caption: Close-up of head
• 
  Species: Pterobunocephalus depressus
  Caption: Close-up of head
• 
  Species: Xyliphius melanopterus
  Caption: Close-up of head
• 
  Species: Ageneiosus inermis
  Caption: Close-up of head
• 
  Species: Ageneiosus marmoratus
  Caption: Close-up of head
• 
  Species: Ageneiosus marmoratus
  Caption: Close-up of head
• 
  Species: Asterophysus batrachus
  Caption: Close-up of head
• 
  Species: Auchenipterichthys punctatus
  Caption: Close-up of head
• 
  Species: Auchenipterichthys punctatus
  Caption: Close-up of head
• 
  Species: Auchenipterus nuchalis
  Caption: Close-up of head
• 
  Species: Balroglanis schultzi
  Caption: Close-up of head
• 
  Species: Duringlanis romani
  Caption: Close-up of head
• 
  Species: Liosomadoras morrowi
  Caption: Close-up of head
• 
  Species: Spinipterus acsi
  Caption: Close-up of head
• 
  Species: Tatia gyrina
  Caption: Close-up of head
• 
  Species: Tatia musaica
  Caption: Close-up of head
• 
  Species: Tatia simplex
  Caption: Close-up of head
• 
  Species: Tetranematichthys wallacei
  Caption: Close-up of head
• 
  Species: Tetranematichthys wallacei
  Caption: Close-up of head
• 
  Species: Trachelyopterus fisheri
  Caption: Close-up of head
• 
  Species: Trachelyopterus galeatus
  Caption: Close-up of head
• 
  Species: Trachelyopterus sp. (2)
  Caption: Close-up of head
• 
  Species: Austroglanis gilli
  Caption: Close-up of head
• 
  Species: Bagrichthys macracanthus
  Caption: Close-up of head
• 
  Species: Hemibagrus microphthalmus
  Caption: Close-up of head
• 
  Species: Hemibagrus wyckii
  Caption: Close-up of head
• 
  Species: Hemibagrus wyckii
  Caption: Close-up of head
• 
  Species: Leiocassis bekantan
  Caption: Close-up of head
• 
  Species: Mystus aff. gulio
  Caption: Close-up of head
• 
  Species: Mystus aff. gulio
  Caption: Close-up of head
• 
  Species: Mystus ankutta
  Caption: Close-up of head
• 
  Species: Mystus bocourti
  Caption: Close-up of head
• 
  Species: Mystus carcio
  Caption: Close-up of head
• 
  Species: Nanobagrus immaculatus
  Caption: Close-up of head
• 
  Species: Pseudomystus cf. stenomus
  Caption: Close-up of head
• 
  Species: Pseudomystus funebris
  Caption: Close-up of head
• 
  Species: Pseudomystus stenogrammus
  Caption: Close-up of head
• 
  Species: Rita kuturnee
  Caption: Close-up of head
• 
  Species: Sperata aor
  Caption: Close-up of head
• 
  Species: Tachysurus fulvidraco
  Caption: Close-up of head
• 
  Species: Corydoras(ln1) blochi
  Caption: Close-up of head
• 
  Species: Corydoras(ln1) narcissus
  Caption: Close-up of head
• 
  Species: Corydoras(ln1) semiaquilus
  Caption: Close-up of head
• 
  Species: Corydoras(ln1) vittatus
  Caption: Close-up of head
• 
  Species: Corydoras(ln7) aeneus
  Caption: Close-up of head
• 
  Species: Corydoras(ln7) schultzei
  Caption: Close-up of head
• 
  Species: Corydoras(ln7) zygatus
  Caption: Close-up of head
• 
  Species: Corydoras(ln8sc4) crimmeni
  Caption: Close-up of head
• 
  Species: Corydoras(ln8sc4) robineae
  Caption: Close-up of head
• 
  Species: Corydoras(ln8sc4) sp. (C141)
  Caption: Close-up of head
• 
  Species: Corydoras(ln9) brevirostris
  Caption: Close-up of head
• 
  Species: Corydoras(ln9) julii
  Caption: Close-up of head
• 
  Species: Corydoras(ln9) sp. (Cw159)
  Caption: Close-up of head
• 
  Species: Corydoras(ln9) sp. (Cw159)
  Caption: Close-up of head
• 
  Species: Megalechis thoracata
  Caption: Close-up of head
• 
  Species: Cetopsis coecutiens
  Caption: Close-up of head
• 
  Species: Bathyclarias foveolatus
  Caption: Close-up of head
• 
  Species: Bathyclarias foveolatus
  Caption: Close-up of head
• 
  Species: Channallabes apus
  Caption: Close-up of head
• 
  Species: Channallabes apus
  Caption: Close-up of head
• 
  Species: Channallabes sp. (1)
  Caption: Close-up of head
• 
  Species: Channallabes sp. (1)
  Caption: Close-up of head
• 
  Species: Clarias alluaudi
  Caption: Close-up of head
• 
  Species: Clarias batrachus
  Caption: Close-up of head
• 
  Species: Clarias gariepinus
  Caption: Close-up of head
• 
  Species: Clarias platycephalus
  Caption: Close-up of head
• 
  Species: Encheloclarias medialis
  Caption: Close-up of head
• 
  Species: Gymnallabes typus
  Caption: Close-up of head
• 
  Species: Gymnallabes typus
  Caption: Close-up of head
• 
  Species: Gymnallabes typus
  Caption: Close-up of head
• 
  Species: Auchenoglanis wittei
  Caption: Close-up of head
• 
  Species: Chrysichthys dendrophorus
  Caption: Close-up of head
• 
  Species: Notoglanidium macrostoma
  Caption: Close-up of head
• 
  Species: Notoglanidium macrostoma
  Caption: Close-up of head
• 
  Species: Parauchenoglanis punctatus
  Caption: Close-up of head
• 
  Species: Phyllonemus filinemus
  Caption: Close-up of head
• 
  Species: Cranoglanis bouderius
  Caption: Close-up of head
• 
  Species: Diplomystes camposensis
  Caption: Close-up of head
• 
  Species: Agamyxis pectinifrons
  Caption: Close-up of head
• 
  Species: Amblydoras nauticus
  Caption: Close-up of head
• 
  Species: Anadoras grypus
  Caption: Close-up of head
• 
  Species: Anadoras weddellii
  Caption: Close-up of head
• 
  Species: Centrodoras brachiatus
  Caption: Close-up of head
• 
  Species: Centrodoras brachiatus
  Caption: Close-up of head
• 
  Species: Doras carinatus
  Caption: Close-up of head
• 
  Species: Hassar wilderi
  Caption: Close-up of head
• 
  Species: Hemidoras stenopeltis
  Caption: Close-up of head
• 
  Species: Orinocodoras eigenmanni
  Caption: Close-up of head
• 
  Species: Oxydoras niger
  Caption: Close-up of head
• 
  Species: Oxydoras niger
  Caption: Close-up of head
• 
  Species: Platydoras armatulus
  Caption: Close-up of head
• 
  Species: Platydoras costatus
  Caption: Close-up of head
• 
  Species: Pterodoras granulosus
  Caption: Close-up of head
• 
  Species: Rhinodoras armbrusteri
  Caption: Close-up of head
• 
  Species: Rhinodoras boehlkei
  Caption: Close-up of head
• 
  Species: Tenellus cristinae
  Caption: Close-up of head
• 
  Species: Gladioglanis anacanthus
  Caption: Close-up of head
• 
  Species: Gladioglanis machadoi
  Caption: Close-up of head
• 
  Species: Goeldiella eques
  Caption: Close-up of head
• 
  Species: Pimelodella sp. (2)
  Caption: Close-up of head
• 
  Species: Pimelodella sp. (3)
  Caption: Close-up of head
• 
  Species: Rhamdella aymarae
  Caption: Close-up of head
• 
  Species: Rhamdia quelen
  Caption: Close-up of head
• 
  Species: Ameiurus natalis
  Caption: Close-up of head
• 
  Species: Ictalurus furcatus
  Caption: Close-up of head
• 
  Species: Ictalurus punctatus
  Caption: Close-up of head
• 
  Species: Noturus insignis
  Caption: Close-up of head
• 
  Species: Acanthicus adonis
  Caption: Close-up of head
• 
  Species: Acanthicus adonis
  Caption: Close-up of head
• 
  Species: Acanthicus hystrix
  Caption: Close-up of head
• 
  Species: Acestridium gymnogaster
  Caption: Close-up of head
• 
  Species: Ancistomus sp. (L147)
  Caption: Close-up of head
• 
  Species: Ancistrus aff. ranunculus
  Caption: Close-up of head
• 
  Species: Ancistrus sp. (2)
  Caption: Close-up of head
• 
  Species: Ancistrus sp. (L107)
  Caption: Close-up of head
• 
  Species: Ancistrus sp. `LOWER RIO NEGRO`
  Caption: Close-up of head
• 
  Species: Ancistrus temminckii
  Caption: Close-up of head
• 
  Species: Ancistrus triradiatus
  Caption: Close-up of head
• 
  Species: Aphanotorulus ammophilus
  Caption: Close-up of head
• 
  Species: Aphanotorulus ammophilus
  Caption: Close-up of head
• 
  Species: Aphanotorulus emarginatus
  Caption: Close-up of head
• 
  Species: Aposturisoma myriodon
  Caption: Close-up of head
• 
  Species: Baryancistrus demantoides
  Caption: Close-up of head
• 
  Species: Baryancistrus sp. (L019)
  Caption: Close-up of head
• 
  Species: Baryancistrus sp. (L142)
  Caption: Close-up of head
• 
  Species: Chaetostoma dupouii
  Caption: Close-up of head
• 
  Species: Chaetostoma sp. (5)
  Caption: Close-up of head
• 
  Species: Chaetostoma sp. (5)
  Caption: Close-up of head
• 
  Species: Chaetostoma sp. (L455)
  Caption: Close-up of head
• 
  Species: Chaetostoma sp. (L457)
  Caption: Close-up of head
• 
  Species: Chaetostoma sp. `COLOMBIA`
  Caption: Close-up of head
• 
  Species: Corumbataia tocantinensis
  Caption: Close-up of head
• 
  Species: Crossoloricaria cephalaspis
  Caption: Close-up of head
• 
  Species: Crossoloricaria variegata
  Caption: Close-up of head
• 
  Species: Dolichancistrus fuesslii
  Caption: Close-up of head
• 
  Species: Dolichancistrus fuesslii
  Caption: Close-up of head
• 
  Species: Farlowella amazonum
  Caption: Close-up of head
• 
  Species: Farlowella hahni
  Caption: Close-up of head
• 
  Species: Farlowella paraguayensis
  Caption: Close-up of head
• 
  Species: Farlowella vittata
  Caption: Close-up of head
• 
  Species: Harttia punctata
  Caption: Close-up of head
• 
  Species: Hemiancistrus subviridis
  Caption: Close-up of head
• 
  Species: Hemiodontichthys acipenserinus
  Caption: Close-up of head
• 
  Species: Hisonotus chromodontus
  Caption: Close-up of head
• 
  Species: Hypancistrus contradens
  Caption: Close-up of head
• 
  Species: Hypancistrus inspector
  Caption: Close-up of head
• 
  Species: Hypancistrus inspector
  Caption: Close-up of head
• 
  Species: Hypancistrus sp. `LOWER RIO XINGU`
  Caption: Close-up of head
• 
  Species: Hypoptopoma cf. guentheri
  Caption: Close-up of head
• 
  Species: Hypoptopoma inexspectatum
  Caption: Close-up of head
• 
  Species: Hypoptopoma sp. `PERU(1)`
  Caption: Close-up of head
• 
  Species: Hypostomus aspidolepis
  Caption: Close-up of head
• 
  Species: Hypostomus bolivianus
  Caption: Close-up of head
• 
  Species: Hypostomus plecostomus
  Caption: Close-up of head
• 
  Species: Hypostomus regani
  Caption: Close-up of head
• 
  Species: Hypostomus regani
  Caption: Close-up of head
• 
  Species: Hypostomus scaphyceps
  Caption: Close-up of head
• 
  Species: Hypostomus soniae
  Caption: Close-up of head
• 
  Species: Hypostomus sp. (L231)
  Caption: Close-up of head
• 
  Species: Hypostomus sp. (L245)
  Caption: Close-up of head
• 
  Species: Hypostomus sp. (L360)
  Caption: Close-up of head
• 
  Species: Lasiancistrus heteracanthus
  Caption: Close-up of head
• 
  Species: Lasiancistrus sp. (L033)
  Caption: Close-up of head
• 
  Species: Leporacanthicus cf. galaxias(l240)
  Caption: Close-up of head
• 
  Species: Leporacanthicus galaxias
  Caption: Close-up of head
• 
  Species: Leporacanthicus heterodon
  Caption: Close-up of head
• 
  Species: Leporacanthicus joselimai
  Caption: Close-up of head
• 
  Species: Leporacanthicus sp. (L263)
  Caption: Close-up of head
• 
  Species: Loricaria luciae
  Caption: Close-up of head
• 
  Species: Loricariichthys anus
  Caption: Close-up of head
• 
  Species: Loricariichthys anus
  Caption: Close-up of head
• 
  Species: Loricariichthys platymetopon
  Caption: Close-up of head
• 
  Species: Megalancistrus parananus
  Caption: Close-up of head
• 
  Species: Metaloricaria paucidens
  Caption: Close-up of head
• 
  Species: Otocinclus flexilis
  Caption: Close-up of head
• 
  Species: Otocinclus vittatus
  Caption: Close-up of head
• 
  Species: Oxyropsis wrightiana
  Caption: Close-up of head
• 
  Species: Panaqolus albivermis
  Caption: Close-up of head
• 
  Species: Panaqolus maccus
  Caption: Close-up of head
• 
  Species: Panaqolus sp. (L002)
  Caption: Close-up of head
• 
  Species: Panaqolus sp. (L329)
  Caption: Close-up of head
• 
  Species: Panaqolus sp. (L397)
  Caption: Close-up of head
• 
  Species: Panaqolus sp. (L453)
  Caption: Close-up of head
• 
  Species: Panaqolus sp. (L453)
  Caption: Close-up of head
• 
  Species: Panaqolus sp. (L458)
  Caption: Close-up of head
• 
  Species: Panaque armbrusteri
  Caption: Close-up of head
• 
  Species: Paraloricaria commersonoides
  Caption: Close-up of head
• 
  Species: Paraloricaria vetula
  Caption: Close-up of head
• 
  Species: Parotocinclus jumbo
  Caption: Close-up of head
• 
  Species: Peckoltia braueri
  Caption: Close-up of head
• 
  Species: Peckoltia brevis
  Caption: Close-up of head
• 
  Species: Peckoltia compta
  Caption: Close-up of head
• 
  Species: Peckoltia sabaji
  Caption: Close-up of head
• 
  Species: Peckoltia sp. (L205)
  Caption: Close-up of head
• 
  Species: Peckoltia sp. (L387)
  Caption: Close-up of head
• 
  Species: Peckoltia sp. `RIO NEGRO`
  Caption: Close-up of head
• 
  Species: Pseudacanthicus cf. leopardus
  Caption: Close-up of head
• 
  Species: Pseudacanthicus cf. spinosus
  Caption: Close-up of head
• 
  Species: Pseudacanthicus cf. spinosus
  Caption: Close-up of head
• 
  Species: Pseudacanthicus leopardus
  Caption: Close-up of head
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  Species: Pseudacanthicus leopardus
  Caption: Close-up of head
• 
  Species: Pseudacanthicus pirarara
  Caption: Close-up of head
• 
  Species: Pseudacanthicus sp. (L273)
  Caption: Close-up of head
• 
  Species: Pseudacanthicus sp. (LDA105)
  Caption: Close-up of head
• 
  Species: Pseudancistrus depressus
  Caption: Close-up of head
• 
  Species: Pseudohemiodon aff. apithanos
  Caption: Close-up of head
• 
  Species: Pseudohemiodon aff. apithanos
  Caption: Close-up of head
• 
  Species: Pseudohemiodon laticeps
  Caption: Close-up of head
• 
  Species: Pseudohemiodon sp. `PERU II`
  Caption: Close-up of head
• 
  Species: Pseudohemiodon sp. `PERU I`
  Caption: Close-up of head
• 
  Species: Pseudohemiodon sp. `PERU I`
  Caption: Close-up of head
• 
  Species: Pseudolithoxus anthrax
  Caption: Close-up of head
• 
  Species: Pseudolithoxus dumus
  Caption: Close-up of head
• 
  Species: Pseudolithoxus nicoi
  Caption: Close-up of head
• 
  Species: Pterosturisoma microps
  Caption: Close-up of head
• 
  Species: Pterosturisoma microps
  Caption: Close-up of head
• 
  Species: Pterygoplichthys pardalis
  Caption: Close-up of head
• 
  Species: Pterygoplichthys pardalis
  Caption: Close-up of head
• 
  Species: Pterygoplichthys parnaibae
  Caption: Close-up of head
• 
  Species: Pterygoplichthys sp. (L164)
  Caption: Close-up of head
• 
  Species: Pterygoplichthys weberi
  Caption: Close-up of head
• 
  Species: Rineloricaria aff. latirostris
  Caption: Close-up of head
• 
  Species: Rineloricaria cacerensis
  Caption: Close-up of head
• 
  Species: Rineloricaria felipponei
  Caption: Close-up of head
• 
  Species: Rineloricaria melini
  Caption: Close-up of head
• 
  Species: Rineloricaria parva
  Caption: Close-up of head
• 
  Species: Rineloricaria sp. (2)
  Caption: Close-up of head
• 
  Species: Rineloricaria sp. (3)
  Caption: Close-up of head
• 
  Species: Rineloricaria sp. (4)
  Caption: Close-up of head
• 
  Species: Rineloricaria thrissoceps
  Caption: Close-up of head
• 
  Species: Scobinancistrus cf. pariolispos
  Caption: Close-up of head
• 
  Species: Scobinancistrus sp. (L082)
  Caption: Close-up of head
• 
  Species: Scobinancistrus sp. (L082)
  Caption: Close-up of head
• 
  Species: Scobinancistrus sp. (L082)
  Caption: Close-up of head
• 
  Species: Spatuloricaria sp. (1)
  Caption: Close-up of head
• 
  Species: Spatuloricaria sp. `RIO NANAY`
  Caption: Close-up of head
• 
  Species: Spatuloricaria sp. `RIO NANAY`
  Caption: Close-up of head
• 
  Species: Spatuloricaria sp. `RIO SAN ALEJANDRO`
  Caption: Close-up of head
• 
  Species: Spectracanthicus murinus
  Caption: Close-up of head
• 
  Species: Sturisoma barbatum
  Caption: Close-up of head
• 
  Species: Sturisoma nigrirostrum
  Caption: Close-up of head
• 
  Species: Sturisoma nigrirostrum
  Caption: Close-up of head
• 
  Species: Sturisoma nigrirostrum
  Caption: Close-up of head
• 
  Species: Sturisoma nigrirostrum
  Caption: Close-up of head
• 
  Species: Sturisomatichthys leightoni
  Caption: Close-up of head
• 
  Species: Malapterurus electricus
  Caption: Close-up of head
• 
  Species: Malapterurus electricus
  Caption: Close-up of head
• 
  Species: Chiloglanis polypogon
  Caption: Close-up of head
• 
  Species: Chiloglanis pretoriae
  Caption: Close-up of head
• 
  Species: Euchilichthys guentheri
  Caption: Close-up of head
• 
  Species: Microsynodontis polli
  Caption: Close-up of head
• 
  Species: Mochokiella paynei
  Caption: Close-up of head
• 
  Species: Mochokiella paynei
  Caption: Close-up of head
• 
  Species: Synodontis acanthomias
  Caption: Close-up of head
• 
  Species: Synodontis batesii
  Caption: Close-up of head
• 
  Species: Synodontis caudalis
  Caption: Close-up of head
• 
  Species: Synodontis clarias
  Caption: Close-up of head
• 
  Species: Synodontis clarias
  Caption: Close-up of head
• 
  Species: Synodontis decorus
  Caption: Close-up of head
• 
  Species: Synodontis eupterus
  Caption: Close-up of head
• 
  Species: Synodontis irsacae
  Caption: Close-up of head
• 
  Species: Synodontis katangae
  Caption: Close-up of head
• 
  Species: Synodontis lucipinnis
  Caption: Close-up of head
• 
  Species: Synodontis macropunctatus
  Caption: Close-up of head
• 
  Species: Synodontis ocellifer
  Caption: Close-up of head
• 
  Species: Synodontis orientalis
  Caption: Close-up of head
• 
  Species: Synodontis pardalis
  Caption: Close-up of head
• 
  Species: Synodontis petricola
  Caption: Close-up of head
• 
  Species: Synodontis robbianus
  Caption: Close-up of head
• 
  Species: Synodontis rukwaensis
  Caption: Close-up of head
• 
  Species: Synodontis schoutedeni
  Caption: Close-up of head
• 
  Species: Synodontis soloni
  Caption: Close-up of head
• 
  Species: Synodontis sorex
  Caption: Close-up of head
• 
  Species: Synodontis sp. hybrid(4)
  Caption: Close-up of head
• 
  Species: Synodontis sp. `LOWER GUINEA`
  Caption: Close-up of head
• 
  Species: Synodontis tanganyicae
  Caption: Close-up of head
• 
  Species: Synodontis vanderwaali
  Caption: Close-up of head
• 
  Species: Synodontis victoriae
  Caption: Close-up of head
• 
  Species: Synodontis xiphias
  Caption: Close-up of head
• 
  Species: Pangasianodon gigas
  Caption: Close-up of head
• 
  Species: Pangasius sanitwongsei
  Caption: Close-up of head
• 
  Species: Aguarunichthys torosus
  Caption: Close-up of head
• 
  Species: Brachyplatystoma filamentosum
  Caption: Close-up of head
• 
  Species: Calophysus macropterus
  Caption: Close-up of head
• 
  Species: Calophysus macropterus
  Caption: Close-up of head
• 
  Species: Leiarius marmoratus
  Caption: Close-up of head
• 
  Species: Leiarius pictus
  Caption: Close-up of head
• 
  Species: Luciopimelodus pati
  Caption: Close-up of head
• 
  Species: Parapimelodus sp. `MANAUS`
  Caption: Close-up of head
• 
  Species: Pimelodus ornatus
  Caption: Close-up of head
• 
  Species: Platysilurus mucosus
  Caption: Close-up of head
• 
  Species: Pseudoplatystoma fasciatum
  Caption: Close-up of head
• 
  Species: Pseudoplatystoma reticulatum
  Caption: Close-up of head
• 
  Species: Pseudoplatystoma reticulatum
  Caption: Close-up of head
• 
  Species: Neosilurus ater
  Caption: Close-up of head
• 
  Species: Neosilurus brevidorsalis
  Caption: Close-up of head
• 
  Species: Neosilurus brevidorsalis
  Caption: Close-up of head
• 
  Species: Plotosus papuensis
  Caption: Close-up of head
• 
  Species: Plotosus papuensis
  Caption: Close-up of head
• 
  Species: Lophiosilurus alexandri
  Caption: Close-up of head
• 
  Species: Pseudopimelodus mangurus
  Caption: Close-up of head
• 
  Species: Pareutropius buffei
  Caption: Close-up of head
• 
  Species: Belodontichthys dinema
  Caption: Close-up of head
• 
  Species: Ceratoglanis scleronema
  Caption: Close-up of head
• 
  Species: Kryptopterus vitreolus
  Caption: Close-up of head
• 
  Species: Pterocryptis anomala
  Caption: Close-up of head
• 
  Species: Pterocryptis anomala
  Caption: Close-up of head
• 
  Species: Pterocryptis berdmorei
  Caption: Close-up of head
• 
  Species: Pterocryptis berdmorei
  Caption: Close-up of head
• 
  Species: Pterocryptis furnessi
  Caption: Close-up of head
• 
  Species: Silurus biwaensis
  Caption: Close-up of head
• 
  Species: Silurus triostegus
  Caption: Close-up of head
• 
  Species: Wallago attu
  Caption: Close-up of head
• 
  Species: Wallago attu
  Caption: Close-up of head
• 
  Species: Bagarius bagarius
  Caption: Close-up of head
• 
  Species: Creteuchiloglanis kamengensis
  Caption: Close-up of head
• 
  Species: Erethistes mesembrinus
  Caption: Close-up of head
• 
  Species: Gagata cenia
  Caption: Close-up of head
• 
  Species: Gagata gagata
  Caption: Close-up of head
• 
  Species: Glyptothorax anamalaiensis
  Caption: Close-up of head
• 
  Species: Glyptothorax chavomensis
  Caption: Close-up of head
• 
  Species: Glyptothorax decussatus
  Caption: Close-up of head
• 
  Species: Glyptothorax indicus
  Caption: Close-up of head
• 
  Species: Glyptothorax lanceatus
  Caption: Close-up of head
• 
  Species: Glyptothorax rugimentum
  Caption: Close-up of head
• 
  Species: Glyptothorax rugimentum
  Caption: Close-up of head
• 
  Species: Glyptothorax telchitta
  Caption: Close-up of head
• 
  Species: Glyptothorax zanaensis
  Caption: Close-up of head
• 
  Species: Gogangra viridescens
  Caption: Close-up of head
• 
  Species: Oreoglanis macroptera
  Caption: Close-up of head
• 
  Species: Pseudecheneis longipectoralis
  Caption: Close-up of head
• 
  Species: Pseudecheneis sp. (1)
  Caption: Close-up of head
• 
  Species: Pseudolaguvia ferula
  Caption: Close-up of head
• 
  Species: Pseudolaguvia ferula
  Caption: Close-up of head
• 
  Species: Pseudolaguvia flavida
  Caption: Close-up of head
• 
  Species: Henonemus triacanthopomus
  Caption: Close-up of head
• 
  Species: Ituglanis amazonicus
  Caption: Close-up of head
• 
  Species: Pareiodon microps
  Caption: Close-up of head
• 
  Species: Pseudostegophilus maculatus
  Caption: Close-up of head
• 
  Species: Sarcoglanis simplex
  Caption: Close-up of head
• 
  Species: Trichomycterus alternatus
  Caption: Close-up of head
• 
  Species: Trichomycterus brasiliensis
  Caption: Close-up of head
• 
  Species: Trichomycterus brasiliensis
  Caption: Close-up of head
• 
  Species: Vandellia cirrhosa
  Caption: Close-up of head
• 
  Species: Farlowella sp. (1)
  Caption: Close-up of head - female
• 
  Species: Pterygoplichthys gibbiceps
  Caption: Close-up of head (adult)
• 
  Species: Neblinichthys pilosus
  Caption: Close-up of head (dorsal)
• 
  Species: Ancistrus sp. `RIO CHIRGUA`
  Caption: Close-up of head (front)
• 
  Species: Neblinichthys pilosus
  Caption: Close-up of head (lateral)
• 
  Species: Spatuloricaria caquetae
  Caption: Close-up of head (male)
• 
  Species: Brachyplatystoma rousseauxii
  Caption: Close-up of head (nose damaged)
• 
  Species: Neblinichthys pilosus
  Caption: Close-up of head (ventral)
• 
  Species: Chauliocheilos saxatilis
  Caption: Close-up of head / male lip morphology
• 
  Species: Leiarius pictus
  Caption: Close-up of head and dorsal fin
• 
  Species: Synodontis longirostris
  Caption: Close-up of head and humeral process-250 mm SL
• 
  Species: Hypancistrus vandragti
  Caption: Close-up of head and opercular odontodes
• 
  Species: Otothyris lophophanes
  Caption: Close-up of head and suckermouth
• 
  Species: Hypancistrus sp. (L066)
  Caption: Close-up of head of female
• 
  Species: Hypancistrus sp. (L070)
  Caption: Close-up of head of female
• 
  Species: Panaqolus albivermis
  Caption: Close-up of head of female
• 
  Species: Leporacanthicus cf. galaxias(l241)
  Caption: Close-up of head of juvenile
• 
  Species: Ancistrus cf. cirrhosus
  Caption: Close-up of head of male
• 
  Species: Hemiancistrus sp. (L128)
  Caption: Close-up of head of male
• 
  Species: Hypancistrus furunculus
  Caption: Close-up of head of male
• 
  Species: Hypancistrus sp. (L066)
  Caption: Close-up of head of male
• 
  Species: Hypancistrus sp. (L070)
  Caption: Close-up of head of male
• 
  Species: Leporacanthicus cf. galaxias(l240)
  Caption: Close-up of head of male
• 
  Species: Leporacanthicus cf. galaxias`venezuela`
  Caption: Close-up of head of male
• 
  Species: Leporacanthicus galaxias
  Caption: Close-up of head of male
• 
  Species: Panaqolus albivermis
  Caption: Close-up of head of male
• 
  Species: Peckoltia sp. `RIO TOCANTINS`
  Caption: Close-up of head of male
• 
  Species: Rineloricaria sp. (7)
  Caption: Close-up of head of male
• 
  Species: Rineloricaria sp. (L010A)
  Caption: Close-up of head of male
• 
  Species: Synodontis schoutedeni
  Caption: Close-up of head of male
• 
  Species: Ancistrus cf. cirrhosus
  Caption: Close-up of head of piebald male
• 
  Species: Parakysis notialis
  Caption: Close-up of head on view
• 
  Species: Tatia reticulata
  Caption: Close-up of head on view
• 
  Species: Megalodoras uranoscopus
  Caption: Close-up of head showing ''third eye''
• 
  Species: Megalodoras uranoscopus
  Caption: Close-up of head showing ''third eye''
• 
  Species: Sturisomatichthys aureus
  Caption: Close-up of head showing cheek bristles
• 
  Species: Pseudotanganikallabes prognatha
  Caption: Close-up of head showing extended lower lip
• 
  Species: Dekeyseria scaphirhynchus
  Caption: Close-up of head showing grooves
• 
  Species: Synodontis multipunctatus
  Caption: Close-up of head showing humeral process
• 
  Species: Auchenoglanis senegali
  Caption: Close-up of head-110 mm SL
• 
  Species: Auchenoglanis cf. occidentalis
  Caption: Close-up of head-28 cm TL
• 
  Species: Sturisomatichthys panamensis
  Caption: Close-up of head-Southern Panama
• 
  Species: Astroblepus caquetae
  Caption: Close-up of head, Dorsal view
• 
  Species: Ancistrus lineolatus
  Caption: Close-up of head, Dorsal view
• 
  Species: Chaetostoma platyrhynchus
  Caption: Close-up of head, Dorsal view
• 
  Species: Chaetostoma sp. (6)
  Caption: Close-up of head, dorsal view
• 
  Species: Chaetostoma vagum
  Caption: Close-up of head, Dorsal view
• 
  Species: Hypostomus argus
  Caption: Close-up of head, Dorsal view
• 
  Species: Hypostomus niceforoi
  Caption: Close-up of head, Dorsal view
• 
  Species: Hypostomus oculeus
  Caption: Close-up of head, Dorsal view
• 
  Species: Rineloricaria felipponei
  Caption: Close-up of head, Dorsal view
• 
  Species: Rineloricaria pareiacantha
  Caption: Close-up of head, Dorsal view
• 
  Species: Hypancistrus sp. (L066)
  Caption: Close-up of head, male
• 
  Species: Astroblepus caquetae
  Caption: Close-up of head, Ventral view
• 
  Species: Hypoptopoma inexspectatum
  Caption: Close-up of head, ventral view
• 
  Species: Otocinclus mariae
  Caption: Close-up of head, ventral view
• 
  Species: Oxyropsis wrightiana
  Caption: Close-up of head; Dorsal view
• 
  Species: Rineloricaria stewarti
  Caption: Close-up of head; Dorsal view
• 
  Species: Hypostomus cf. paulinus
  Caption: Close-up of head. Dorsal view
• 
  Species: Pseudacanthicus pirarara
  Caption: Female - close-up of head
• 
  Species: Scobinancistrus sp. (L253)
  Caption: Female - close-up of head
• 
  Species: Rineloricaria teffeana
  Caption: Male - close-up of head
• 
  Species: Scobinancistrus sp. (L253)
  Caption: Male - close-up of head
• 
  Species: Spatuloricaria sp. `RIO NANAY`
  Caption: Male, close-up of head
• 
  Species: Glanidium ribeiroi
  Caption: Preserved specimen - close-up of head
• 
  Species: Lasiancistrus caucanus
  Caption: Preserved specimen - close-up of head