praecox, Lampetra fluviatilis forma Berg [L. S.] 1932:38, Figs. 32, 37 [Les poissons des eaux douces de l'U.R.S.S. Part 1; ref. 278] Ladoga and Onega lakes and their basins, Russia. Syntypes: (many) ZIN 6177 (2) Narova, 14861 (2), 29171 (6), 29184 (6+), 19185 (6+), 29195 (6+). Treated as infrasubspecific by Kottelat 1997:27 [ref. 22952] but a "form" can be subspecific. •Synonym of Lampetra fluviatilis (Linnaeus 1758) -- (Vladykov 1973:4 [ref. 7159], Hardisty 1986:250 [ref. 24820], Kottelat 1997:27 [ref. 22952]). •Hybrid between Lampetra fluviatilis (Linnaeus 1758) and L. planeri (Bloch 1784) -- (Reshetnikov et al. 1997:725 [ref. 24702]). Hybrid. Current status: Synonym of Lampetra fluviatilis (Linnaeus 1758). Petromyzontidae. Habitat: freshwater, brackish, marine.