THE XERCES SOCIETY FOR INVERTEBRATE CONSERVATION Aquatic Invertebrates in Pacific Northwest Freshwater Wetlands |
Identify taxa MolluscaUnionoidaUncommon in wetlands |
| Margaritifera falcata (western pearlshell) Shell is fairly thick, jelly bean-shaped and very dark; besides growth rings, no prominent ridges are present; empty shells have purple (most) or pinkish-orange (around Klamath Lake) interior, but may be white as shell wears after mussel dies. |
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| Gonidea
angulata (western ridged mussel) The shell is thick and has a distinct ridge from the umbo to the farthest edge: this is a distinctive feature that can even be used in worn shells and fragments; inside of shell pearly white. |
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