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• 
  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:
  Bunocephalus coracoideus
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Auchenipterichthys coracoideus
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Spinipterus moijiri
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Hyalobagrus flavus
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Agamyxis pectinifrons
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Amblydoras nauticus
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Ancistrus caucanus
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Chaetostoma anale
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Chaetostoma platyrhynchus
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Chaetostoma vagum
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Dekeyseria picta
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Hypancistrus contradens
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Hypancistrus sp. (L136)
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Hypancistrus sp. (L260)
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Hypancistrus sp. (L333)
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Hypancistrus sp. (L527)
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Hypostomus argus
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Hypostomus isbrueckeri
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Hypostomus niceforoi
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Hypostomus oculeus
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Lamontichthys llanero
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Loricaria nimairaco
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Panaqolus albivermis
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Panaque armbrusteri
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Parotocinclus haroldoi
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Peckoltia compta
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Peckoltia sabaji
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Pseudohemiodon almendarizi
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Pseudohemiodon unillano
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Rineloricaria eigenmanni
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Spectracanthicus punctatissimus
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Sturisomatichthys reinae
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Synodontis grandiops
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Synodontis waterloti
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Brachyplatystoma tigrinum
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Erethistes jerdoni
  
  Caption: Close-up of pectoral fin
• 
  Species:
  Panaque schaeferi
  
  Caption: Close-up of pectoral fin area
• 
  Species:
  Duringlanis perugiae
  
  Caption: Close-up of pectoral fin ray
• 
  Species:
  Liosomadoras oncinus
  
  Caption: Close-up of pectoral fin ray
• 
  Species:
  Callichthys callichthys
  
  Caption: Close-up of pectoral fin ray
• 
  Species:
  Acanthicus hystrix
  
  Caption: Close-up of Pectoral fin. Rio Tocantins, near town of Estreito, Maranhão state, Brazil
• 
  Species:
  Panaqolus sp. (L448)
  
  Caption: Close-up of pectoral fins
• 
  Species:
  Rineloricaria aurata
  
  Caption: Close-up of pectoral fins
• 
  Species:
  Batrochoglanis transmontanus
  
  Caption: Close-up of venomous pectoral fin spine
• 
  Species:
  Erethistes pusillus
  
  Caption: Example of divergent spines on outside edge of pectoral fin ray
• 
  Species:
  Hypostomus roseopunctatus
  
  Caption: Female pectoral fin
• 
  Species:
  Scobinancistrus sp. (L253)
  
  Caption: Female pectoral fin
• 
  Species:
  Erethistes horai
  
  Caption: Female pectoral fin
• 
  Species:
  Leporacanthicus cf. galaxias(l241)
  
  Caption: Female pectoral fin (smaller odontodes)
• 
  Species:
  Pseudolithoxus dumus
  
  Caption: Female, close-up of pectoral fin
• 
  Species:
  Pseudolithoxus kinja
  
  Caption: L385, Close-up of pectoral fin
• 
  Species:
  Hypostomus roseopunctatus
  
  Caption: Male pectoral fin
• 
  Species:
  Leporacanthicus cf. galaxias(l241)
  
  Caption: Male pectoral fin
• 
  Species:
  Scobinancistrus sp. (L253)
  
  Caption: Male pectoral fin
• 
  Species:
  Pseudolithoxus dumus
  
  Caption: Male, close-up of pectoral fin
• 
  Species:
  Corydoras sp. (C042)
  
  Caption: Male, note the pectoral fin
• 
  Species:
  Rineloricaria eigenmanni
  
  Caption: Odontodes on male's head, cheeks & pectoral fins
• 
  Species:
  Brochis (sub-clade 2) pantanalensis
  
  Caption: Pectoral fin
• 
  Species:
  Ancistrus sp. (L100)
  
  Caption: Pectoral fin
• 
  Species:
  Ancistrus sp. (L327)
  
  Caption: Pectoral fin
• 
  Species:
  Chaetostoma milesi
  
  Caption: Pectoral fin
• 
  Species:
  Farlowella vittata
  
  Caption: Pectoral fin
• 
  Species:
  Parancistrus sp. (LDA046)
  
  Caption: Pectoral fin ray
• 
  Species:
  Synodontis angelicus
  
  Caption: Pectoral fin ray
• 
  Species:
  Acestridium dichromum
  
  Caption: Pectoral fin spine
• 
  Species:
  Acestridium triplax
  
  Caption: Pectoral fin spine
• 
  Species:
  Hypancistrus sp. (L316)
  
  Caption: Pectoral fin spine of female
• 
  Species:
  Microglanis aff. iheringi
  
  Caption: Pectoral fin spine, dorsal view
• 
  Species:
  Microglanis aff. iheringi
  
  Caption: Pectoral fin spine, dorsal view
• 
  Species:
  Microglanis parahybae
  
  Caption: Pectoral fin spine, dorsal view
• 
  Species:
  Microglanis poecilus
  
  Caption: Pectoral fin spine, dorsal view
• 
  Species:
  Microglanis poecilus
  
  Caption: Pectoral fin spine, dorsal view
• 
  Species:
  Microglanis secundus
  
  Caption: Pectoral fin spine, dorsal view
• 
  Species:
  Microglanis secundus
  
  Caption: Pectoral fin spine, dorsal view
• 
  Species:
  Microglanis variegatus
  
  Caption: Pectoral fin spine, dorsal view
• 
  Species:
  Erethistes nareshi
  
  Caption: Pectoral fin spine, dorsal view
• 
  Species:
  Microglanis berbixae
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis carlae
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis cottoides
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis garavelloi
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis leniceae
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis lundbergi
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis minutus
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis nigrolineatus
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis oliveirai
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis parahybae
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis pataxo
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis pleriqueater
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis reikoae
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis robustus
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis sparsus
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis xerente
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis xylographicus
  
  Caption: Pectoral fin spine, dorsal view. Bar = 1mm
• 
  Species:
  Microglanis zonatus
  
  Caption: Pectoral fin spine, dorsal view. From Eigenmann & Allen
• 
  Species:
  Microglanis maculatus
  
  Caption: Pectoral fin spine, dorsal view. Holotype & paratype.
• 
  Species:
  Microglanis pellopterygius
  
  Caption: Pectoral fin spine, dorsal view. Variation.
• 
  Species:
  Pseudacanthicus pitanga
  
  Caption: Pectoral fin spines
• 
  Species:
  Caelatoglanis zonatus
  
  Caption: Showing the pectoral fin barbs
• 
  Species:
  Hyalobagrus flavus
  
  Caption: Sketch of pectoral fin ray
• 
  Species:
  Hyalobagrus leiacanthus
  
  Caption: Sketch of pectoral fin ray
• 
  Species:
  Hyalobagrus ornatus
  
  Caption: Sketch of pectoral fin ray