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

Balanus crenatus Bruguière
Crenate Barnacle
Family: Balanidae
Species account author: Ira Cornwall.
Extracted from The Barnacles of British Columbia (1955).

© Aaron Baldwin  Email the photographer   (Photo ID #7883)

E-Fauna BC Static Map
Distribution of Balanus crenatus in British Columbia
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Introduction


Description

Size small, rarely more than one-half inch in diameter even when uncrowded. Shell conical with rhomboidal orifice. When crowded the shell may be cylindrical and rugged or occasionally club-shaped with the upper part wider than the lower.

The carinal margin of each compartment, from the sheath to the base, projects inward slightly beyond the internal surface of the shell. The basal edge of this projecting margin rests on the calcareous base and is crenated like the basal edge of the remainder of the plate.

Colour

White but with a yellowish "epidermis" covering the shell.

Distribution

North Atlantic and Pacific from the Bering Sea south to Southern California (Santa Barbara). Found mainly below low tide and occasionally in the intertidal zone, often on worm tubes and shells of molluscs and crabs.

Notes

Balanus crenatus has been found as fossils in Pliocene formation in Britain and in Pleistocene deposits of Norway, Maine, Canada, and Alaska, indicating that this species has had a wide distribution in the past. Specimens are also present in the Maywood clay (Interglacial) which is exposed on the beach a mile east of Jordan River, Vancouver Island. On the British Columbia coast B. crenatus is often found associated with B. glandulaand, B. cariosus, and when the shells are crowded it is difficult to distinguish between them. B. crenatus is also commonly found growing on the bottoms of ships; Henry also records this species from brackish water at Port San Juan, B.C. A closely related species, Balanus improvisus , has not yet been definitely recorded for British Columbia. It resembles B. crenatus in all details, except that there is an aductor ridge on the scutum.

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) 2019. 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: 21/11/2019 5:59:02 PM]
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