Characidium - Darter Tetras

fish
   Anabantiformes
   Anguilliformes
   Atheriniformes
   Characiformes
     Alestoidea
     Anostomoidea
     Characoidea
       Acestrorhynchidae
       Bryconidae
       Chalceidae
       Characidae
       Crenuchidae
         Crenuchiinae
         Characidiinae
           Ammocryptocharax
           Characidium
             amaila
             crandellii
             declivirostre
             duplicatum
             etheostoma
             krenak
             rachovii
             steindachneri
             wangyapoik
             zebra
           Elachocharax
           Klausewitzia
           Leptocharacidium
           Melanocharacidium
           Odontocharacidium
           Skiotocharax
       Ctenoluciidae
       Gasteropelecidae
       Hepsetidae
       Iguanodectidae
       Lebiasinidae
       Parodontidae
       Triportheidae
     Citharinoidei
     Curimatoidea
     Erythrinoidea
   Cichlidae
   Cypriniformes
   Cyprinodontiformes
   Gobiiformes
   Perciformes
   Siluriformes
   Synbranchiformes
   more
inverts
plants
misc

Ref:
Armbruster, J.W., N.K. Lujan, & D.D. Bloom. 2021. Redescription of the Guiana Shield darter species Characidium crandellii and C. declivirostre (Crenuchidae) with descriptions of two new species. Ichthyology & Herpetology 109:102-122.

https://bioone.org/journals/ichthyology-and-herpetology/volume-109/issue-1/i2019299/Redescription-of-the-Guiana-Shield-Darter-Species-Characidium-crandellii-and/10.1643/i2019299.full