 | Cichlidroom Companion, The. Symphysodon Heckel, 1840. |
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 | Kullander, Sven O. Symphysodon Heckel. Guide to the South American Cichlidae
Holotype of S. d. willischwartzi, MZUSP 15375, 110.7 mm SL. Photograph © S.O.Kullander |
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| Mazeroll, Anthony I. & Marc Weiss. The State of Confusion in Discus Taxonomy. The Cichlidroom Companion (English)
Mazeroll, Anthony I. & Marc Weiss. La Confusión Reinante en la Taxonomía Del Disco. The Cichlidroom Companion (Español) |
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| Ready, Ferreira & Kullander. Discus fishes: mitochondrial DNA evidence for a phylogeographic barrier in the Amazonian genus Symphysodon (Teleostei: Cichlidae). Journal of Fish Biology |
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| Sabolcik, Karen. How Adaptable Are Discus Fish?. The Cichlidroom Companion |
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| Sweeney, Mary Ellen. The Common Sense of Discus. The Cichlidroom Companion |
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| Weiss, Marc. Breeding Discus Secrets. The Cichlidroom Companion |
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| Weiss, Marc. Wasting Away in Discusville. The Cichlidroom Companion |
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