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

Bimastos lawrenceae Fender
Family: Lumbricidae

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Earthworm distribution in BC
Distribution of Bimastos lawrenceae in British Columbia.
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The earthworms of British Columbia are a little known faunal group. We would like to thank the Royal Ontario Museum for providing permissions to use extracts, including illustrations, from the following publication in the atlas pages: Reynolds, John W. 1977. The Earthworms (Lumbricidae and Sparganophilidae) of Ontario. Thanks also to John Reynolds for provision of substantial information on earthworms and review of the atlas pages.

Species Information

This native species is considered an ancient species (Marshall and Fender 2005). McKey-Fender et al. (1994) provide a description for the species (only five specimens ever collected); John Reynolds has summarized this description as follows: “Length ## mm, diameter ## mm, segment number 103, 113, 133, 133, 134, prostomium epilobic, 1st dorsal pore 5/6. Clitellum, saddle-shaped xxv-xxxvi. Tubercula pubertatis absent.n Setae, closely paired, AB ≈ CD, AA ≈ BC ≈ ½ DD. Male pores on xv, female pores on xiv. Gizzard in xvii-xviii. Typhlosole begins very gradually as a pad on the roof of the intestine in xxii-xxiii, becoming bifurcate in cross section at about xxvii. Calciferous gland very well developed in xi-xii, rudimentary calciferous sacs transverse in x. Septa 12/13 to 14/15 stronger than those posterior. Seminal vesicles postseptal in xi and xii only. Nephoropores easily visible on anterior soma at anterior edge of segments, in the first few segments between setal lines C and D, thereafter irregularly alternating between two strict levels, one just above B and one just above D. Colour, reddish, pigment present in circular muscle in extreme anterior and posterior soma, especially dorsal, in life appearing pale reddish and transparent.”

Source: Marshall, Valin G. and William M. Fender. 2007. Native and Introduced Earthworms (Oligochaeta) of British Columbia. Megadrilogica 11 (4): 29-52.


Species Biology

No information is presently available for this species.


This native species is considered an ancient species (Marshall and Fender 2005). All of the collectons of [this species] are from a small area of about 20 km southwest of Port Alberni. The Douglas Peak site is at high altitude, about 1200m, and still remote, while the Museum Junction site is at an elevation of about 200 m along a heavily travelled road. All of the paratypes [of this species] were collected from moist humus and matted vegetation in wet situations.


Global Range

This species is known only from British Columbia, Canada (Reynolds and Wetzel 2008).
Canadian and BC Range

n Canada this species is known only from BC, where it has been found in a limited area on the west part of Vancouver Island (Marshall and Fender 2007). BEC zones: MH and CWH (Marshall and Fender 2007)

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) 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: 2021-05-12 6:22:10 PM]
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