Phylum - Orthonectida

Common name: Orthonectids

Name derivation: “straight swimming”

Family Count: 2

Genus Count: 6

Species Count: 25

Earliest Fossil Record: none

Habitat: Parasitic (Marine)

Size Range: 50 µm to 800 µm

Notes: Treated by some as a type of Annelid. Based on Catalogue of Life as of March 2025

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