E-Fauna BC: Electronic Atlas of the Wildlife of British Columbia

Balanus glandula Darwin, 1854
Acorn Barnacle
Family: Balanidae
Species account author: Ira Cornwall.
Extracted from The Barnacles of British Columbia (1955).
Photo of species

© Liz Watkinson  Email the photographer   (Photo ID #21785)

E-Fauna BC Static Map
Distribution of Balanus glandula in British Columbia
Details about map content are available here.



Size small, about one-half inch (10 to 18 mm) in diameter in uncrowded specimens; height, a little more than half the diameter. Shell cone-shaped, cylindrical or club-shaped when crowded. The variation in the structure of the wall-plates is very marked as some have small regular pores with cross-septa, while others have no pores whatever. When the pores are present, they are filled with white powder, which may obscure the cross-septa. About the best distinguishing character of this species is the jet-black lining of the cover-plates. In young specimens there is a translucent triangular area in each scuta through which this can be seen, but in older specimens the plates are too thick for the black lining to show through.


Usually dirty white or grey.


Aleutian Islands to Lower California, chiefly in the intertidal zone. Abundant on rocks; occasionally in brackish water and on ships' bottoms.


Balanus glandulus is extremely variable in its appearance possibly because of its wide range in habitat.

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)
BC Ministry of Environment: BC Species and Ecosystems Explorer--the authoritative source for conservation information in British Columbia.

Additional Photo Sources

General References

Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2021. E-Fauna BC: Electronic Atlas of the Fauna of British Columbia [efauna.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2024-07-17 4:07:33 PM]
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