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Clubbed Tunicate

Scientific Name

Styela clava Herdman, 1881 (ITIS)

Common Name

Clubbed tunicate, stalked sea squirt, solitary sea squirt, leathery sea squirt, Pacific rough sea squirt, Asian sea squirt

Native To
Date of U.S. Introduction

First observed on the Pacific coast in the 1930s (Clarke and Therriault 2007)

Means of Introduction

Probably introduced accidentally on the hulls of ships or with imported oysters (Clarke and Therriault 2007)


Competes with and displaces native species (Clarke and Therriault 2007)

Current U.S. Distribution

Coastal regions of New England and the Western U.S.

Asian tunicate
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Asian tunicate


Photo by U.S. Geological Survey

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Selected Resources

The section below contains highly relevant resources for this species, organized by source.

Council or Task Force
Federal Government
International Government