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

Chthamalus dalli Pilsbry
Little Brown Barnacle
Family: Chthamalidae
Species account author: Ira Cornwall.
Extracted from The Barnacles of British Columbia (1955).
Photo of species

© Aaron Baldwin  Email the photographer   (Photo ID #2104)

E-Fauna BC Static Map
Distribution of Chthamalus dalli in British Columbia
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Species Information


Description

Shell small, a full-grown specimen containing eggs being a quarter of an inch in greatest diameter. The shell is conical and almost flat, becoming elongate when crowded. The opercular opening is oval in shape and large in proportion to the shell. The junction of the cover-plates forms a cross which is characteristic of the species.

Colour

Pale grey where the shell is eroded, buff in a narrow basal band where the cuticle remains. White in the interior.

Distribution

Unalaska, southern coast of Alaska, coasts of British Columbia, Washington, Oregon, and California. High in the intertidal zone, often in hollows in the rock or on piles.

Notes

Members of this species grow higher in the intertidal zone than any other barnacles. They are therefore exposed to drying for many hours per day. In certain areas fully 90 per cent are sometimes found to be parasitized by the isopod, Homioniscus balani(Spence Bate), which is usually fatal to the host.

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)
COSEWIC
UnlistedUnlistedUnlistedUnlisted
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: 2022-01-16 2:24:26 AM]
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© E-Fauna BC 2021: An initiative of the Spatial Data Lab, Department of Geography, UBC