Syntype of Petromyzon kessleri, TGU 3 [no. 3699 in Ioganzen (1935b: table 3)], 182 mm TL.

 
 
  Part of: Naseka AM, Renaud CB (2020) Morphology-based taxonomic re-assessment of the Arctic lamprey, Lethenteron camtschaticum (Tilesius, 1811) and taxonomic position of other members of the genus. ZooKeys 991: 1-67. https://doi.org/10.3897/zookeys.991.54938