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• 
  Species:
  Ageneiosus magoi
  
  Caption: Close-up of male
• 
  Species:
  Auchenipterichthys coracoideus
  
  Caption: Close-up of male
• 
  Species:
  Bagrus meridionalis
  
  Caption: Close-up of Male
• 
  Species:
  Scleromystax macropterus
  
  Caption: Close-up of male
• 
  Species:
  Ancistrus sp. (3)
  
  Caption: Close-up of male
• 
  Species:
  Ancistrus sp. (3)
  
  Caption: Close-up of male
• 
  Species:
  Hisonotus aky
  
  Caption: Close-up of male
• 
  Species:
  Hypancistrus furunculus
  
  Caption: Close-up of male
• 
  Species:
  Hypancistrus inspector
  
  Caption: Close-up of male
• 
  Species:
  Hypancistrus zebra
  
  Caption: Close-up of male
• 
  Species:
  Panaque cf. cochliodon`upper magdalena`
  
  Caption: Close-up of male
• 
  Species:
  Rineloricaria melini
  
  Caption: Close-up of male
• 
  Species:
  Duringlanis perugiae
  
  Caption: Close-up of male anal fin
• 
  Species:
  Hypancistrus sp. (L501)
  
  Caption: Close-up of male and eggs in spawning cave
• 
  Species:
  Entomocorus gameroi
  
  Caption: Close-up of male genital area
• 
  Species:
  Clarias batrachus
  
  Caption: Close-up of male genital area
• 
  Species:
  Chrysichthys brachynema
  
  Caption: Close-up of male genital area
• 
  Species:
  Megalodoras uranoscopus
  
  Caption: Close-up of male genital area
• 
  Species:
  Goeldiella eques
  
  Caption: Close-up of male genital area
• 
  Species:
  Sturisomatichthys aureus
  
  Caption: Close-up of male genital area
• 
  Species:
  Leiarius pictus
  
  Caption: Close-up of male genital area
• 
  Species:
  Synodontis pardalis
  
  Caption: Close-up of male genital papillae
• 
  Species:
  Sturisomatichthys festivus
  
  Caption: Close-up of male guarding eggs
• 
  Species:
  Sturisomatichthys reinae
  
  Caption: Close-up of male guarding eggs
• 
  Species:
  Entomocorus gameroi
  
  Caption: Close-up of male head
• 
  Species:
  Rineloricaria fallax
  
  Caption: Close-up of male head
• 
  Species:
  Rineloricaria latirostris
  
  Caption: Close-up of male orange colour morph
• 
  Species:
  Farlowella vittata
  
  Caption: Close-up of male rostrum showing odontodes
• 
  Species:
  Pseudancistrus sp. (L259)
  
  Caption: Close-up of male showing cheek bristles
• 
  Species:
  Rineloricaria lanceolata
  
  Caption: Close-up of male showing cheek bristles
• 
  Species:
  Peckoltia sp. `RIO TOCANTINS`
  
  Caption: Close-up of male showing posterior odontodes
• 
  Species:
  Ancistrus sp. `RIO CHIRGUA`
  
  Caption: Close-up of male showing unbranched head tentacles
• 
  Species:
  Hypancistrus sp. (L316)
  
  Caption: Close-up of male's cheek
• 
  Species:
  Panaqolus albivermis
  
  Caption: Close-up of male's genital papillae
• 
  Species:
  Liobagrus marginatus
  
  Caption: Close-up of male's head
• 
  Species:
  Ancistrus sp. (L513)
  
  Caption: Close-up of male's head
• 
  Species:
  Ancistrus sp. (LDA072)
  
  Caption: Close-up of male's head
• 
  Species:
  Leporacanthicus cf. galaxias(l241)
  
  Caption: Close-up of male's head
• 
  Species:
  Pareiorhaphis bahiana
  
  Caption: Close-up of male's head
• 
  Species:
  Panaqolus albivermis
  
  Caption: Close-up of male's odontodes
• 
  Species:
  Hypancistrus sp. (L174)
  
  Caption: Close-up of male's pectoral fin
• 
  Species:
  Baryancistrus sp. (L142)
  
  Caption: Close-up of males pectoral fin ray
• 
  Species:
  Baryancistrus xanthellus
  
  Caption: L081 close-up of male head