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Hediste diadroma
Image courtesy of Kazuyuki Yamada @ MIAW -
Hediste diadroma
Taxonomic Group: Annelids-Polychaetes


Hediste diadroma is a Nereid worm native to the Northwest Pacific. It was first discovered on the West Coast of North America in 2009 with introduced populations in Washington and Oregon. It is found in the upper, mesohaline reaches of estuaries, on lower intertidal mudflats and mud bottoms, salt marshes, oyster beds, and in southern Japan, mangroves. The worms live in U-shaped burrows, and are usually regarded as surface-deposit feeders, feeding on detritus and surface microalgae. Its overall abundance and geographical distribution in North American waters is unknown, as are its ecological impacts.

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Fofonoff PW, Ruiz GM, Steves B, Simkanin C, & Carlton JT (2018)
National Exotic Marine and Estuarine Species Information System.
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Marine Invasions Lab
Smithsonian Environmental Research Center

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