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Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Agnatha
Name derivation: “without jaws”
Number of Orders: 2
Number of Families: 4
Number of Genus: 16
Number of known Species: 129
Earliest Fossil Record: mya
Habitat: Marine, Freshwater
Size Range: 13 cm to 1.3 m
Notes: Based on Catalogue of Life as of July 2024