Additional file 1.

List of catfish specimens from which histological preparations were made and examined. Presence or absence of a bony spine capable of effectively delivering venomous secretions is noted, as is a brief description of the condition of venom glands, in each specimen found to possess them. Taxonomic assignments follow [19].

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Wright BMC Evolutionary Biology 2009 9:282   doi:10.1186/1471-2148-9-282