The Oregon giant earthworm (Driloleirus macelfreshi)is a Species of Concern that is endemic to the Willamette Valley of northwestern Oregon. This unique earthworm species, which can grow to be over 33 inches long, is currently known from fewer than 12 sites. Oregon giant earthworm individuals have not been collected or reliably identified since 1985. In 1985, it was known from four extant sites, and from three other historical collections made in 1930, 1929 and 1903. The rarity of this endemic earthworm is believed to be due to the species apparent requirement for undisturbed soils and its narrow range of tolerance for soil conditions.

The primary objectives of this project are to: (1) evaluate the status of and threats to the Oregon giant earthworm (OGE) by assessing its current distribution and abundance; (2) develop protocols and train biologists, both students and professionals, for detecting and identifying the species since other large earthworms seen in the Willamette Valley can be mistaken for this taxon (3) develop preliminary conservation measures for the species; and, (4) educate land owners and managers about the species and its status and conservation needs on their lands. As part of the study, we will gain insights into the ecological and habitat requirements of the Oregon giant earthworm, and means for further study.
 

Field Project Leader:
       Dana Bailey
 

Collaborators:
       Bill Fender
       Dorothy McKey-Fender
       Judy Jacobs, US Fish and Wildlife Service
       Jimmy Kagen, Oregon Natural Heritage Program
 

Sponsors:
       U.S. Geological Survey, Biological Resources Division
       U. S. Fish and Wildlife Service