Genetic variation at 30 protein-coding loci was examined in seven forms of notothenioid fishes from Antarctica. Multilocus heterozygosity varied from 0.018 to 0.078 across taxa. An analysis of the allozyme data revealed the probable existence of an unrecognized cryptic species within Trematomu5 bemacchii. Pagothenia borchgrevinki is as closely related to some species of Trematomus as are some species of Trematomus to each other. Speciation among the species of Trematomus and Pagothenia appears to have taken place primarily after the separation of Antarctica from Australia.
McDonald, Mara A.; Smith, Michael H.; Smith, Michael W.; Novak, James M.; Johns, Paul E.; and DeVries, Arthur L., "Biochemical Systematics of Notothenioid Fishes from Antarctica" (1992). Faculty Research & Creative Activity. Paper 209.