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Discus macclintocki

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA MOLLUSCA GASTROPODA STYLOMMATOPHORA DISCIDAE

Scientific Name: Discus macclintocki
Species Authority: (F.C. Baker, 1928)
Common Name(s):
English Iowa Pleistocene Snail

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2004
Date Assessed: 2004-04-30
Assessor(s): Frest, T.
Reviewer(s): Seddon, M.B. & Bogan, A.E. (Mollusc Red List Authority)
Justification:
Discus macclintocki previously was listed as Data Deficient. Information is now available to confirm that the species is Least Concern. Discus macclintocki is endemic to the United States. Originally Frest (1984) reported approximately 18 localities, but species-specific surveys in the right habitat suggest there are at least 45 localities where the species is recorded (Frest 1992, Nekola, pers. comm.). Nekola (pers comm.) believes that the population's status is currently stable, with no subpopulations being lost over the last decade. In fact, the main change is the addition of new sites during species specific surveys.
History:
1996 Data Deficient
1994 Endangered (Groombridge 1994)
1990 Endangered (IUCN 1990)
1988 Endangered (IUCN Conservation Monitoring Centre 1988)
1986 Endangered (IUCN Conservation Monitoring Centre 1986)

Geographic Range [top]

Range Description: Endemic to the USA. This species remains restricted to the southern fringe of the 'driftless area': Illinois (Jo Daves Co.); Iowa (Allamakee, Clayton, Clinton, Delaware, Dubuque, Fayette, Jackson). Originally Frest (1984) reported ca. 18 localities, but species specific surveys in the right habitat suggest there are at least 45 localities where the species is recorded (Frest 1992, Nekola, pers. comm).
Countries:
Native:
United States (Illinois, Iowa)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Nekola (pers comm.) believes that the populations status is currently stable, with no populations being lost over the last decade. In fact, the main change is the addition of new sites during species specific surveys.
Population Trend: Increasing

Habitat and Ecology [top]

Habitat and Ecology: This species is largely limited to cool limestone cliffs above algific (cold-producing) talus slopes, or sometimes in/on the talus as well. It seems to like rock fissures in particular.
Systems: Terrestrial

Threats [top]

Major Threat(s): Main threat is habitat change either through changing microclimate or vegetation change. McMillan and Nekola (2003) note that these habitats are vulnerable to impact of rock climbing at sites.

Conservation Actions [top]

Conservation Actions: The status of this species should be reviewed regularly to check that the species has not started to decline.

Citation: Frest, T. 2004. Discus macclintocki. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 19 September 2014.
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