Freshwater Mollusks - U.S. Fish and Wildlife Service

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How to Use This Guide part i Elongated or pointed shells part ii Round or wide shape part iii Clams * Southern Idaho has few large clams, but there are many “fingernail” or “pea” clams. These are very difficult to identify and are not included in this Guide. Stagnicola spp Radix auricularia Gonidea angulata If you don’t feel you can positively identify the mollusk, or if it appears to be a species described only to the generic level, consider collecting the individual for positive identification. (See Reporting Element Occurrences, page 40) Mollusk Anatomy snail limpet ethan nedeau ethan nedeau body whorl spire posterior slope shoulder umbilicus foot slightly convex shape here midline foot midline protoconch apex suture parietal lip aperture plait or fold (not shown) tentacle snout concave shape here anterior slope 4 5
Freshwater Habitats springs Southern Idaho has a tremendous concentration of freshwater springs and spring-fed creeks. Most exist on private land. Amazingly, these springs and spring-fed creeks contribute greater than 5,000 cubic feet per second (cfs) to the base flow of the Snake River, which greatly improves water clarity, quality and habitat availability for mollusks. The springs are characterized by relatively slow flows, stable, cool temperatures and crystal-clear water. Substrates for these types of habitat range from fine sands to larger pebble/gravel or cobble/boulder areas with submerged vegetation. Springs and creeks are easily waded, and are ideal for clearbotttom buckets or hand collections. Freshwater Habitats tributary streams Tributary streams in southern Idaho are generally mid-sized, with predictable flows, although they are known to flash flood following severe weather. Driven by snowmelt, tributaries are much colder than large rivers or reservoir systems that typically have warmer water temperatures due to large surface areas and volume. Tributary streams have moderate to swift currents and cobble to bouldersized substrates. In some areas, fine sediments may also be found. Tributaries are accessible to collectors with waders, though caution must be exercised in high flow conditions, deep pools and rapids. 6 7
Page 1 and 2: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Page 3 and 4: Table of Contents Introduction.....
Page 5: Introduction A Guide to Southern Id
Page 9 and 10: Freshwater Mollusks Freshwater Moll
Page 11 and 12: Fossaria spp. T his genus of snails
Page 13 and 14: Pyrgulopsis robusta A t least ten P
Page 15 and 16: Fluminicola spp. T springs, tributa
Page 17 and 18: Radix auricularia T tributaries, ri
Page 19 and 20: Valvata utahensis springs, tributar
Page 21 and 22: Anodonta spp. T tributaries, rivers
Page 23 and 24: Margaritifera falcata tributaries,
Page 25 and 26: Mollusk Literature Burch. John Baya
Page 27 and 28: Notes Notes
Page 29 and 30: Notes Notes
Page 31 and 32: detach and mail Data Collection For
Page 33: detach and mail Data Collection For

Freshwater Mollusks - U.S. Fish and Wildlife Service

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