| Deroceras hesperium | |
|---|---|
Scientific classification  | |
| 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.
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]
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.
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Deroceras invadens is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusc in the family Agriolimacidae. Until 2011, this widely distributed species was known as Deroceras panormitanum, and earlier as Deroceras caruanae or Agriolimax caruanae, but Reise et al. (2011) showed that these names refer to a distinct species of similar external appearance known at that time only from Sicily and Malta. Consequently, although the more widespread species was already well known, it then had to be redescribed under the new name of D. invadens. Genetic evidence has indicated that D. invadens is native in southern Italy, including parts of Sicily, and possibly parts of central Italy. Elsewhere it has been introduced, predominantly within the last 100 years, but its spread has been constrained by cold winter temperatures.
Dolphin and Union Caribou, Dolphin and Union caribou herd, Dolphin-Union, locally known as Island Caribou, are a migratory population of barren-ground caribou, Rangifer tarandus groenlandicus, that occupy Victoria Island in the Canadian Arctic Archipelago and the nearby mainland. They are endemic to Canada. They migrate across the Dolphin and Union Strait from their summer grazing on Victoria Island to their winter grazing area on the Nunavut-Northwest Territories mainland in Canada. It is unusual for North American caribou to seasonally cross sea ice and the only other caribou to do so are the Peary caribou who are smaller in size and population. They were listed as Endangered by Committee on the Status of Endangered Wildlife in Canada (COSEWIC) since November 2017.
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