Exploring the Intertidal

Check out the intertidal zone and its biodiversity!

Annelida

There are between 9000-12400 species of these segmented worms, including the common earth worm. The body plan is divided into repeating segments, separated by thin membranes called septa. This repeating body plan is called metameric. Annelids have a complete digestive tract and circulatory system. Most Annelids belong to the Class Polychaeta. Polychaetes burrow in sediments or live in tubes. The species shown here creates a tube out of mucous secretions mixed with sand grains. The feathery appendages at the anterior end are used for food capture, or may be vascularized to act as gills for gas exchange.

Eudistylia vancouveri
Northern Feather Duster Worm

Description:  Found in tough, white tube. Green and purple tentacles used for feeding and gas exchange found at anterior end.
Range:  Alaska to Central California
Habitat:  Found on rocks and pilings; low intertidal.
Cool Fact:  Eyespots on tentacles signal worm to retract into tube when a shadow (potential predator) passes over.

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