Dallia - Arctic mudminnows

Dallia is a genus of mudminnows native to Russia and Alaska. Molecular data indicates the genus is more closely related to Esox and Novumbra than Umbra. Dallia diverged from Novumbra + Esox approximately 66 million years ago.

Three species in this genus are recognized:

• Dallia admirabilis Chereshnev, 1980 (Amguema blackfish)
• Dallia delicatissima Smitt, 1881 (Pilkhykay blackfish)
• Dallia pectoralis T. H. Bean, 1880 (Alaska blackfish)

Mitochondrial sequence data was examined from D. pectoralis and D. admirabilis and did not indicate that speciation within the genus in Russia; however, genetic isolation within Alaska for populations of D. pectoralis could be high and associated with karyotype differences.