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Articulated coralline algae

Calliarthron tuberculosum


Calliarthron tuberculosum is characterized by a thallus that is hard because of calcareous deposits contained within the cell walls, but also has uncalcified joints that allow it to flex in response to the waves to which it is subjected. This specimen was about 5 cm long.


Spotted on the beach at Joseph Whidbey State Park.


Coralline algae play an important role in the ecology of coral reefs. Sea urchins, parrot fish, and limpets and chitons (both mollusks) feed on coralline algae. In the temperate Mediterranean sea, coralline algae are the main builders of a typical algal reef.

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Washington, USA

Lat: 48.31, Long: -122.71

Spotted on Dec 8, 2018
Submitted on Dec 15, 2018

Nearby spottings

Rockweed Red Sea Weed Great blue heron Gumboot Chiton