Deroceras hesperium
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Order: Stylommatophora
Family: Agriolimacidae
Genus: Deroceras
Species:
D. hesperium
Binomial name
Deroceras hesperium
Pilsbry, 1944

Deroceras hesperium, common name the evening fieldslug, is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Agriolimacidae.

Distribution

Deroceras hesperium was described by Henry A. Pilsbry from slugs collected at Oswego, Oregon. [1] Later (1948), Pilsbry elaborated on the type locality and stated it as "a small island in Oswego Lake, Oswego, Clackamas County, Oregon.[2] In the same publication, he added additional Oregon records and mentioned a collection of slugs found in 1887 from Comox, Vancouver Island, British Columbia.[2]

Conservation status

This species was assessed as "Data Deficient" (DD) by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC).[3] In the Northwestern US, this formerly common species has declined by 50-75% and is now "truly rare" according to the 2004 Survey and Manage species assessment. It is now found only in northwestern Oregon, the northern Olympic Peninsula and the northeast coast of Vancouver Island. The US Fish and Wildlife Service recently determined that listing this species as endangered may be warranted due to the present or threatened destruction of its habitat resulting from activities that lower the water table or reduce soil moisture, including spring diversions, grazing, and logging.

References

  1. ↑ Pilsbry, Henry A. (1944), "West American field slugs (Deroceras)", The Nautilus, 58 (1): 15–16
  2. 1 2 Pilsbry, Henry A. (1948), "Land Mollusca of North America (north of Mexico), Volume II, Part 2", The Academy of Natural Sciences of Philadelphia, Monographs, 3: xlvii + 521–1113
  3. ↑ COSEWIC. 2005. Canadian Species at Risk. Committee on the Status of Endangered Wildlife in Canada. 64 pp., page 38.
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