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Hemichordates: Hemichordata

Physical Characteristics, Behavior And Reproduction, Hawaiian Acorn Worm (ptychodera Flava): Species Accounts, Spaghetti Worm (saxipendium Coronatum): Species AccountsGEOGRAPHIC RANGE, HABITAT, DIET, HEMICHORDATES AND PEOP

HAWAIIAN ACORN WORM (Ptychodera flava): SPECIES ACCOUNTS
SPAGHETTI WORM (Saxipendium coronatum): SPECIES ACCOUNTS

Hemichordates live in all the oceans of the world.


Adult acorn worms usually live in shallow water in burrows at the bottom, but sometimes they live in the sand inside shells, under rocks, in thick seaweed, or between root tangles. Colony-forming hemichordates usually live in deep water in the tubes they make from mucus.

Hemichordates eat bacteria, microscopic algae, diatoms, and nutrients they scrape from particles of sand and mud or collect from the water. Algae (AL-jee) are plantlike growths that live in water and have no true roots, stems, or leaves. Diatoms (DYE-uh-tahms) are a type of algae that have a shell.


Hemichordates have no known importance to people.


Hemichordates are not considered threatened or endangered.

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