| Family | Scientific Name | Author | Year | Common Name |
| Petromyzontidae | Petromyzon marinus | Linnaeus | 1758 | Sea Lamprey |
Petromyzon marinus
Unique Characters: Mouth is a funnel-shaped opening with large, sharp disc teeth. Jaws absent. Seven gill slits posterior to eye. Nostril is a single medial pit. The two dorsal fins are widely divided. Pectoral and pelvic fins absent. Large adults are strongly mottled; juveniles silvery.
Similar Species: None
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