Overview

Distribution

endemic to a single nation

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National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

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Global Range: (250-20,000 square km (about 100-8000 square miles)) Known from the piedmont area of Georgia, North Carolina, South Carolina and Tennessee.

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Range Description

Endemic to the United States: Piedmont area of Georgia, North Carolina, South Carolina and Tennessee. The species is known from 11 counties within these states.
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Physical Description

Size

Length: 4 cm

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Diagnostic Description

Abdominal segment 9 is longer than 8 but shorter than 7. Genitalia. (Westfall, 1965; Carle & May, 1987).

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Ecology

Habitat

Comments: Boggy trickles, slow small streams, and lakes, these with sandy silt bottoms and sphagnum moss edges. Adults forage in open forest near ground level.

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Habitat and Ecology

Habitat and Ecology
Boggy trickles, slow, small streams and lakes, all with part sand, part silt bottoms, and sphagnum moss margins (Dunkle 2000).

Systems
  • Terrestrial
  • Freshwater
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Migration

Non-Migrant: No. All populations of this species make significant seasonal migrations.

Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).

Locally Migrant: No. No populations of this species make annual migrations of over 200 km.

Probably does not stray far from larval habitats.

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Population Biology

Number of Occurrences

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: 6 - 20

Comments: Known from 11 locations in four states. Most of the range of this species is in the Carolinas. In South Carolina it is found only in two counties distant from each other and there are no records in Tennessee (Bick, 2003). It is known from three locations in Richmond County, Georgia (Beaton, 2007b).

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Global Abundance

10,000 - 100,000 individuals

Comments: Maybe 1000 or more at each location.

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General Ecology

Larvae require acid, slowly moving water.

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Life History and Behavior

Cyclicity

Comments: Larvae overwinter, adult flight season early April to late May.

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N3 - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: G3 - Vulnerable

Reasons: This species has a small range with specific habitat requirements. No specific threats are known.

Other Considerations: Adults inconspicuous, must be carefully sampled.

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IUCN Red List Assessment


Red List Category
NT
Near Threatened

Red List Criteria

Version
3.1

Year Assessed
2007

Assessor/s
Abbott, J.C.

Reviewer/s
Donnelly, N., Suhling, F. & Clausnitzer, V. (Odonata Red List Authority)

Contributor/s

Justification
Gomphus diminutus has a small range with specific habitat requirements. There may be 1,000 or more at each location though no specific current threats are known. It occurs in a number of protected areas including Cheraw State Park, Campbell Lake State Park, and the Savanna River Plant in South Carolina. Known from 11 locations in four states. Estimated area of occupancy is less than 2,000 km². Adults are inconspicuous, must be carefully sampled. Assessed as Near Threatened as it nearly meets criteria for Vulnerable B2 and potential threats include development and forestry.

History
  • 1994
    Rare
    (Groombridge 1994)
  • 1990
    Rare
    (IUCN 1990)
  • 1988
    Rare
    (IUCN Conservation Monitoring Centre 1988)
  • 1986
    Rare
    (IUCN Conservation Monitoring Centre 1986)
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Global Short Term Trend: Relatively stable (=10% change)

Comments: Usual general threats, no specific threats known.

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Population

Population
Maybe 1,000 or more at each location. Known from 11 locations in four states.

Population Trend
Unknown
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Threats

Degree of Threat: Unknown

Comments: No current specific threats are known, but potential threats include development and forestry (Abbott, 2007).

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Major Threats
No specific threats known. Potential threats include forestry and development.
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Management

Biological Research Needs: Describe larvae

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Global Protection: Few (1-3) occurrences appropriately protected and managed

Comments: Occurs in Cheraw State Park, Campbell Lake State Park, and the Savanna River Plant in South Carolina.

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Conservation Actions

Conservation Actions
Occurs in Cheraw State Park, Campbell Lake State Park, and the Savanna River Plant in South Carolina.
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Wikipedia

Gomphus diminutus

Gomphus diminutus is a species of dragonfly in family Gomphidae. It is endemic to the United States. Its natural habitats are rivers, freshwater lakes, and intermittent freshwater marshes.

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Names and Taxonomy

Taxonomy

Comments: G. westfalli may be a subspecies. Classified in the subgenus Phanogomphus (Carle 1986).

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