Ichthyococcus

Ichthyococcus, the fireflyfishes, is a genus of deep-sea stomiiform fish. It is the only member of the family Ichthyococcidae.

==Included species== There are currently seven recognized species in this genus: Ichthyococcus australis Mukhacheva, 1980 (Southern lightfish) Ichthyococcus elongatus S. Imai, 1941 (Slim lightfish) Ichthyococcus intermedius Mukhacheva, 1980 (Intermediate lightfish) Ichthyococcus irregularis Rechnitzer & J. E. Böhlke, 1958 (Bulldog lightfish) Ichthyococcus ovatus (Cocco, 1838) (Lightfish) Ichthyococcus parini Mukhacheva, 1980 Ichthyococcus polli Blache, 1963 Members of this family were formerly placed in the family Phosichthyidae, but a 2025 phylogenetic study found the latter family to be paraphyletic as previously described. Ichthyococcus was found to belong to a distinct lineage sister to the clade containing the Phosichthyidae and Stomiidae, and was thus described as its own family, the Ichthyococcidae.