Abstract

The finding of six fish specimens of the genus Chromis in the coast of Valdivia, Chile (ca. 39°S), promoted a taxonomie study that led to the conclusion that the fishes in question were Chromis crusma. This finding represents an extension of the southernmost distributional limit for this species as well as the family Pomacentridae in the coast of the SE Pacific ocean. Morphometric and meristic data obtained from the specimens are given, as well as discussion of the biogeographic significance of this finding. Some controversial aspects about other species of the genus Chromis and their geographical distribution in Chilean waters are also discussed. A key is provided for the recognition of species of the genus Chromis from Chilean waters.