Kingdom: Animalia
Subkingdom: Eumetazoa
Phylum: Chordata
Subphylum: Gnathostomata
Subphylum: Vertebrata
Class: Actinopterygii
Order: Petromyzontiformes
Family: Petromyzontidae
Genus: Petromyzon
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Number of observations per MGRS 10k field }}
MGRS 10k Field Number of Observations Present in literature