''Ichthyomyzon'' is a genus of

northern lamprey The northern lampreys (Petromyzontidae) are a family of lampreys. Northern lampreys have the highest number of chromosomes (164–174) among vertebrates. Genera * '' Caspiomyzon'' * ''Entosphenus'' * ''Eudontomyzon'' * ''Ichthyomyzon'' * ''Lam ...

s in the sub-family Petromyzontinae, native to

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

Species

There are currently six recognized species in this genus: * ''

Ichthyomyzon bdellium The Ohio lamprey (''Ichthyomyzon bdellium'') is a lamprey found in the Ohio River drainage basin in the United States and is a parasitic species of lampreys. They are considered to be an endangered/rare species in some states, due to siltation, ...

'' ( D. S. Jordan, 1885) (Ohio lamprey) * ''

Ichthyomyzon castaneus The chestnut lamprey (''Ichthyomyzon castaneus'') is a species of lamprey. Description The chestnut lamprey has a maximum length of around , in Canada, with dark grey to olive skin color, blue-black after spawning, and with five to eight bicusp ...

'' Girard, 1858 (Chestnut lamprey) * ''

Ichthyomyzon fossor The northern brook lamprey (''Ichthyomyzon fossor'') is a freshwater fish in the family Petromyzontidae. It is closely related to the silver lamprey (''I. unicuspis'') and may represent an ecotype of a single species with ''I. unicuspis''. Desc ...

'' Reighard & Cummins, 1916 (Northern brook lamprey) * ''

Ichthyomyzon gagei The southern brook lamprey (''Ichthyomyzon gagei'') is a lamprey found in the Southern United States including Arkansas, Louisiana, Mississippi, Alabama, and Georgia. It is a jawless fish with a sucking mouth on one end of it (like a leech). It ...

'' C. L. Hubbs & Trautman, 1937 (Southern brook lamprey) * ''

Ichthyomyzon greeleyi The mountain brook lamprey or Allegheny brook lamprey (''Ichthyomyzon greeleyi'') is a lamprey found in parts of the Mississippi river basin, New York, Pennsylvania, Ohio, and in the Cumberland River and Tennessee River The Tennessee Riv ...

'' C. L. Hubbs & Trautman, 1937 (Mountain brook lamprey) * ''

Ichthyomyzon unicuspis The silver lamprey (''Ichthyomyzon unicuspis'') is a lamprey commonly found in the Northern and Central United States, as well as a large part of southern Canada. Its binomial name means "sucking fish" in Greek and "one-pointed" in Latin. The si ...

'' C. L. Hubbs & Trautman, 1937 (Silver lamprey)

References

Petromyzontidae Jawless fish genera {{jawless-fish-stub