Driloleirus macelfreshi (Smith, 1937)

Oregon giant earthworm



Taxonomy & Nomenclature

Synonym/s: Megascolides macelfreshi Smith, 1937


Conservation Status

Last record: 29 April 1981?; 1985 (Suckling et al., 2004).

Rediscovered in 2008 (Gervais, 2008).

IUCN RedList status: Endangered



Willamette Valley & Oregon Coast Range, Oregon, USA


Biology & Ecology










Original description:

Smith, F. (1937). New North American species of earthworms of the family Megascolecidae. United States National Museum, Proceedings 84: 157-181. [166-168]


Other references:

Blakemore, Robert J. (2014). Driloleirus macelfreshi. The IUCN Red List of Threatened Species 2014: e.T6829A21416138. Accessed on 07 November 2022.

Fender, W. M. (1995). Native Earthworms of the Pacific Northwest: An Ecological Overview. In: Hendrix, P.F. (ed.), Earthworm Ecology and Biogeography in North America., CRC Press, Boca Raton, Florida., Boca Raton, Florida.

Fender, W. M. and McKey-Fender, D. (1990). Oligochaeta: Megascolecidae and Other Earthworms from Western North America. In: Dindal, D. L. (ed.). Soil Biology Guide. New York: Wiley & Sons.

Gervais, Jennifer. (2008). Details of “Rediscovery” of Oregon Giant Earthworm in 2008. Unpuplished report.

Groombridge, B. (ed.). 1994. 1994 IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland and Cambridge, UK.

IUCN. 1990. 1990 IUCN Red List of Threatened Animals. Gland, Switzerland and Cambridge, UK.

Reynolds, John Warren. (2015). A checklist by counties of earthworms (Oligochaeta: Lumbricidae, Megascolecidae, Ocnerodrilidae, and Sparganophilidae) in Oregon, USA. Megadrilogica 18(10): 141-156. [Marion County]

Reynolds, John Warren. (2016a). Earthworms (Oligochaeta: Acanthodrilidae, Lumbricidae, Megascolecidae, Ocnerodrilidae and Sparganophilidae) in the Willamete Valley ecoregion (3), USA. Megadrilogica 20(9): 162-169.

Reynolds, John Warren. (2016b). Earthworms (Oligochaeta: Lumbricidae and Megascolecidae) in the Cascades ecoregion (4), USA. Megadrilogica 20(9): 170-177. [Marion County]

Suckling, Kieran, Slack, Rhiwena and Nowicki, Brian. (2004). Extinct and the Endangered Species Act. Centre For Biological Diversity. 63 pp.

Wells, S.M., Pyle, R.M. and Collins, N.M. (compilers) 1983. The IUCN Invertebrate Red Data Book. IUCN, Gland, Switzerland and Cambridge, UK.

World Conservation Monitoring Centre. (1996). Driloleirus macelfreshi. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. ( Downloaded on 18 February 2013.


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