Light organ anomalies in three species of myctophid fishes (Actinopterygii: Myctophiformes: Myctophidae) from the Pacific coast of Mexico

Despite numerous anomalies that have been reported for many species of fishes, records on deep-water species are scarce and apparently very rare for luminescent organs (i.e., photophores). In presently reported study, we described and illustrated anomalies in the number and placement of primary light organs in three lanternfish species: the Mexican lampfish, Triphoturus mexicanus (Gilbert, 1890); the highseas lampfish, Triphoturus nigrescens (Brauer, 1904); and the popeye lampfish, Bolinichthys longipes (Brauer, 1906), collected off the Pacific coast of Mexico.