|Family||Scientific Name||Author||Year||Common Name|
|Petromyzontidae||Petromyzon marinus||Linnaeus||1758||Sea Lamprey|
Unique Characters: The two dorsal fins are widely divided. Large, sharp disc teeth. Large adults strongly mottled; juveniles silvery.
Least Brook Lamprey Lampetra aepyptera. The adult Sea Lamprey is readily distinguished from the Least Brook Lamprey by a number of characters, but the ammocoetes are more difficult to differentiate. The Sea Lamprey has 66-75 trunk myomeres versus 52-59 in the Least Brook Lamprey. Additionally, there is a lot of black pigment in the tail of the Sea Lamprey ammocoete versus none in the Least Brook Lamprey ammocoete.