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Browse Gastropod Families
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An entirely North American family of algal grazers, generally under threat
due to pollution, habitat loss and siltation. When found, they tend to
occur in large numbers.
Elimia spp.
15-30 mm in height, E. livescens slightly
smaller of the two. Aperture ovate, anterior end of aperture without
canal. E. virginica may have dark bands parallel to whorls
both interior and exterior. E livescens has less suture indentation.
Whorls may be smooth or costate and/or lirate. The two Great Lakes
species may hybridize producing intermediate forms.
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Pleurocera acuta
Up to 14 whorls, 20-40 mm in height. Aperture rectangular,
with a short anterior canal. Shell sculpture varies.
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Gastropod
anatomy - Freshwater Mollusk Conservation Society
Species List
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Common Name |
Genus |
Species |
Reported Locations** |
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Elimia (aka Goniobasis) |
spp. |
X |
Elimia are most often found in faster flowing water near the midchannel
of streams, attached to rocks. The two Great Lakes species may hybridize. |
liver elimia |
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livescens |
WN HEO |
20mm. Native to the Great Lakes but invading the Hudson River system.
Typically found in freshwater rivers and streams on rock shoals
and gravel bars.
Profile
- USGS
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Piedmont elimia |
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virginica |
O |
Atlantic native invasive to the Great Lakes. to 30mm. Typically
found in freshwater rivers and streams with cobble bottoms and boulders.
Profile
- SGNIS
Profile
- USGS
GLANSIS
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sharp hornsnail |
Pleurocera |
acuta |
R H |
Native to the Great Lakes but invading Hudson River system. Prefers
slow flow areas of streams and rivers near the bank and often leave
trails in the substrate. Burrows in sand or mud.
Profile
- USGS |
** Reported locations based on a limited literature search.
Codes indicate presence reported but absence of a code should not
be interpreted as a species absence.
H (Lake Huron) based on:
- Abundance,
Biomass, and Species Composition of Benthic Macroinvertebrate
Populations in Saginaw Bay, Lake Huron, 1987-96. Thomas Nalepa,
David Fanslow, Margaret Lansing, Gregory Lang, Mark Ford, Gerald
Gostenik, and David Hartson. NOAA Technical Memorandum GLERL-122.
- Relationships
among zoobenthos, sediments, and organic matter in littoral zones
of western Lake Erie and Saginaw Bay. 1983. Richard A. Cole and
Diana L. Weigmann. JGLR 9(4)568-581.
- Wave-zone
macrobenthos of the exposed Canadian shores of the St. Lawrence
Great Lakes. 1978. D.R. Barton and B.N. Hynes. JGLR 4(1)27-45.
- Benthic
Community Structure and Composition among rocky habitats in the
Great Lakes and Keuka Lake, NY. 1987. Michael H. Winnell and David
J. Jude. JGLR 13(1)3-17.
- NOAA
Great Lakes Nonindigenous Species List
E (Lake Erie) based on:
- Relationships
among zoobenthos, sediments, and organic matter in littoral zones
of western Lake Erie and Saginaw Bay. 1983. Richard A. Cole and
Diana L. Weigmann. JGLR 9(4)568-581.
- Wave-zone
macrobenthos of the exposed Canadian shores of the St. Lawrence
Great Lakes. 1978. D.R. Barton and B.N. Hynes. JGLR 4(1)27-45.
- Distribution
of some common benthic invertebrates in nearshore Lake Erie, with
emphasis on depth and type of substratus. 1988. David R. Barton.
JGLR 14(1)34-43.
- Benthic
and pelagic secondary production in Lake Erie after the invasion
of Dreissena spp. with implications for fish production. 2000.
Ora E. Johannsson, Ron Dermott, Donna M Graham, Julie A. Dahl,
E. Scott Millard, Debra D. Myles, and Jennifer LeBlanc. JGLR 26(1)31-54.
- Changes
in the benthic macroinvertebrate community of the Cleveland Harbor
area of Lake Erie from 1978 to 1989. 1993. Kenneth A. Krieger
and Lloyd S. Ross. JGLR 19(2) 237-249.
- Lethal
and sublethal effects of sponge overgrowth on introduced dreissenid
mussels in the Great Lakes - St. Lawrence River system. 1995.
A Ricciardi, FL Snyder, DO Kelch and HM Reiswig. CJFAS 52:2695-2703.
- Changes
to the deepwater benthos of eastern Lake Erie since the invasion
of Dreissena 1979-1993. 1997. R Dermott and D Kerec. CJFAS 54:
922-930.
- NOAA
Great Lakes Nonindigenous Species List
O (Lake Ontario) based on:
X (Great Lakes coastal wetlands) based on:
W (wave zone = 0-2m) based on: Wave-zone
macrobenthos of the exposed Canadian shores of the St. Lawrence
Great Lakes. 1978. D.R. Barton and B.N. Hynes. JGLR 4(1)27-45.
R (rocky habitats) based on: Benthic
Community Structure and Composition among rocky habitats in the
Great Lakes and Keuka Lake, NY. 1987. Michael H. Winnell and David
J. Jude. JGLR 13(1)3-17.
N (nearshore) based on:
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