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

Apomatus geniculatus (Moore & Bush, 1904)
Pearl-topped Calcareous Tubeworm; Polychaete Worm

Photo of species

© Neil McDaniel  Email the photographer   (Photo ID #58548)

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


A large serpulid tubeworm that grows with tube affixed to rocky walls, especially in BC fjords. Note the distinctive pearl-shaped operculum. Formerly it was thought there were two local species, but Apomatus timsii is now considered to be the same species and the name is a junior synonym.

Note Author: Neil McDaniel

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.

Synonyms and Alternate Names

Apomatus geniculata (Moore & Bush, 1904)
Apomatus timsii Pixel, 1912

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: 2023-11-29 6:24:07 AM]
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© E-Fauna BC 2021: An initiative of the Spatial Data Lab, Department of Geography, UBC