Driloleirus americanus Smith, 1897

Giant Palouse earthworm, Washington giant earthworm



Taxonomy & Nomenclature



Conservation Status

Last record: 1988

Rediscovered in May 2005

IUCN RedList status: Vulnerable



Idaho & Washington, USA


Biology & Ecology










Original description:

Smith, Frank. (1897).  Upon an Undescribed Species of Megascolides from the United States. The American Naturalist 31: 202. [Abstract]


Other references:

Fauci, M. (April, 2002). Palouse Giant Earthworm. Presented at the 2002 Palouse Prairie Symposium, Palouse Prairie Foundation, Moscow, ID.

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

University Of Idaho (2006, 2 February). Idaho Researcher Finds Rare Giant Palouse Earthworm. ScienceDaily. Retrieved November 18, 2012, from­ /releases/2006/02/060202081127.htm

University of Idaho (2008, May 5). Two Discoveries Add To Giant Earthworm Science In Northwest. ScienceDaily. Retrieved November 18, 2012, from­ /releases/2008/05/080504195011.htm

World Conservation Monitoring Centre. (1996). Driloleirus americanus. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. ( Downloaded on 17 November 2012.


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