Compiler and date details
20 April 2011 - Douglass F. Hoese, Jennifer E. Gates & Dianne J. Bray
This order includes three families and about 100 species of largely freshwater species found worldwide (Nelson 2006 following Johnson & Patterson 1993). All species are characterised by an elongate body with a ventral gill opening. Johnson & Patterson (1993) suggested a relationship with atheriniform, mugiliform and gasterosteiform fishes.
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