- Animal Diversity Web Order Gymnotiformes
- Provides a classification guide. With images.
- Chromosome Evolution in Fish: Sex Chromosome Variability in Eigenmannia Virescens (Gymnotiformes: St
- Information on the article by L.F. de Almeida-Toledo, et. al.
- Diversity and Phylogeny of Neotropical Electric Fishes (Gymnotiformes)
- Reviews article by James S. Albert and William G. R. Crampton.
- Funet Network Gymnotiformes
- Provides guide to families.
- Gymnotiformes Electric Fish
- Provides photos of member species and listing of families.
- ITIS Report: Gymnotiformes
- Furnishes data on taxonomic hierarchy and status, nomenclature, resources, and references.
- Knifefishes (Gymnotiformes): Fishes
- Provides list of member species.
- MavicaNET: Knifefishes (Gymnotiformes)
- Features links to taxonomic groups, related categories, and online information about neotropical electric fishes.
- Mikko's Phylogeny Archive Gymnotiformes Neotropical Electric Fishes
- Presents a classification guide.
- Mikko's Phylogeny Archive Gymnotiformes-Families
- Provides classification guide to subgroups.
- Mongabay.com Knifefish
- Provides description and classification guide.
- Order Gymnotiformes Contains These Families:
- Provides a guide to subgroups.
- Phylogenetic Analysis of the South American Electric Fishes (Order Gymnotiformes)
- Provides abstract of the article by Alves-Gomes JA, Orti G, Haygood M, Heiligenberg W, Meyer A.
- Redescription of Apteronotus mariae and the Taxonomic Status of Apteronotus jurubidae [PDF]
- Presents abstract and introduction of the article by Carlos David de Santana and Javier Maldonado-Ocampo.
- Redescription of Gymnotiformes coatesi (Gymnotiformes, Gymnotidae)
- Information on the article by William G. R. Crampton and James S. Albert.
- Redescription of Gymnotus coatesi (Gymnotiformes, Gymnotidae): A Rare Species of Electric Fish
- Information on the article by Crampton, William G. R. and Abert, James S. Provides link to purchase PDF of full text.
- Redescription of Sternopygus obtusirostris (Gymnotiformes: Sternopygidae)
- Information on the article by Willaim G. R. Crampton Kevin G. Hulen and James S. Albert.
- Taxonomicon: Order Gymnotiformes- Knifefishes
- Provides a classification guide.
- Tree of Life Gymnotiformes
- Discusses classification, phylogenetic relationships and behavior. With illustrations.
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