Phylum - Chaetognatha

Common name: Arrow Worms

Name derivation: "bristle jaws"

  • Class: Sagittoidea

Order Count: 2

Family Count: 9

Genus Count: 26

Species Count: 132

Earliest Fossil Record: Early Cambrian 538 - 521 mya

Habitat: Marine

Size Range: 11 mm to 11 cm

Notes: Based on Catalogue of Life as of March 2025

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