| Gonidea | |
|---|---|
 | |
| Mature western ridged mussel | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Unionida |
| Family: | Unionidae |
| Genus: | Gonidea Conrad, 1857 |
| Species: | G. angulata |
| Binomial name | |
| Gonidea angulata | |
Gonidea angulata, the western ridged mussel or Rocky Mountain ridged mussel, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. It is the only species in the genus Gonidea.
Shell is 125 mm long, 65 mm high, 40 mm wide. [3]
The western ridged mussel historically occurred in river basins spanning portions of the western states of California, Idaho, Nevada, Oregon, and Washington, and the Canadian province of British Columbia.
The western ridged mussel has declined significantly throughout much of its range in western North America. Research indicates that the species has experienced a significant reduction in range from the historic distribution (43%), [4] with the southern extent of the species’ range in California having contracted northward approximately 475 miles as compared to the historic range. Live western ridged mussels were not detected at 46% of the 87 sites where it historically occurred and that have been recently revisited.
In Canada, it lives in British Columbia, where the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) has listed it as a species of special concern. The Canadian Species at Risk Act listed it in the List of Wildlife Species at Risk as being a species of special concern in Canada in 2003, and as endangered in 2010. [5] [6]
The dwarf wedgemussel is an endangered species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
The northern riffleshell, is a subspecies of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
Celtis tenuifolia, the dwarf hackberry or Georgia hackberry is a shrub or small tree 2 to 12 meters high. It is native to eastern North America but is very uncommon north of the Ohio River. In Canada, dwarf hackberry is designated as threatened and protected under Canada's Species at Risk Act.
The Species at Risk Act (SARA) is a piece of Canadian federal legislation which became law in Canada on December 12, 2002. It is designed to meet one of Canada's key commitments under the International Convention on Biological Diversity. The goal of the Act is to prevent wildlife species in Canada from disappearing by protecting endangered or threatened organisms and their habitats. It also manages species which are not yet threatened, but whose existence or habitat is in jeopardy.
Anarhichas minor, the spotted wolffish or leopardfish, is a large marine fish of the family Anarhichadidae. This bottom-dwelling species is found across the North Atlantic and adjacent parts of the Arctic Ocean from north of Russia and the Scandinavian Peninsula to the Scotian Shelf, off Nova Scotia, Canada. In Canada the population declined by about 90% from the late 1970s through the early 1990s, particularly in the northern part of its range. In Canada it is classified as a threatened species.
The Banff Springs snail is a species of small air-breathing freshwater snail in the family Physidae.
Lampsilis cariosa, the yellow lampmussel, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
Obovaria subrotunda, common name the round hickorynut, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
Quadrula quadrula, the mapleleaf, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
Villosa fabalis, the rayed bean, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
Lampsilis fasciola, the wavy-rayed lampmussel, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
Pleurobema sintoxia, the round pigtoe, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
Epioblasma triquetra, common name the snuffbox mussel, is a species of freshwater mussel, a mollusk in the family Unionidae. It is native to eastern North America, where it is a listed as an endangered species in both Canada and the United States.
The Hemphillia dromedarius, common name the dromedary jumping-slug, is a species of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the family Arionidae, the roundback slugs.
Hemphillia is a genus of air-breathing land slugs, terrestrial pulmonate gastropod mollusks in the family Arionidae, the roundback slugs.
The Hemphillia glandulosa, common name the warty jumping-slug, is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Arionidae.
Villosa iris, the rainbow mussel or rainbow-shell, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.
Oarisma poweshiek, the Poweshiek skipperling, is a North American butterfly in the family Hesperiidae (skippers), subfamily Hesperiinae. The range of this species in Canada is restricted to southeastern Manitoba, and in the United States it historically ranged from the Dakotas to the southern Lower Peninsula of Michigan.
Sanfilippodytes bertae, or Bert's predaceous diving beetle, is listed as an endangered species of beetle currently residing in southern Alberta, Canada, and is protected under the federal Species at Risk Act. It has no current subspecies. The species belongs to the taxonomy of arthropods, kingdom Animalia, class Insecta, order Coleoptera, superfamily Dytiscoidea and family Dytiscidae.
Peltigera gowardii, or western waterfan, is an aquatic lichen found only in mountain streams of Western North America. It is the largest aquatic lichen in the Pacific Northwest.
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