Male of C. sp. ‘lepidophage’ in the aquarium. © Anthony Terceira

Members of the genus Cyprinodon, often referred to collectively as ‘pupfishes’, aren’t particularly well-known in the aquarium hobby for a variety of reasons, not least that many of the 50 or so species inhabit isolated environments and are not especially easy to maintain in captivity, plus they tend to lack the gaudy colouration which has made African relatives such as Nothobranchius or Aphyosemion so popular. Continue reading »

New study investigates evolutionary ages and convergence of freshwater elephantfishes and neotropical knifefishes…

Among teleosts some of the more bizarre-looking belong to the superfamily Mormyroidea (freshwater elephantfishes) and order Gymnotiformes (neotropical knifefishes), but both these groups are perhaps most notable for their shared ability to generate and receive weak electric fields used in communication and navigation. Continue reading »