Epigomphus subsimilis


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Epigomphus subsimilis
Species Authority: Calvert, 1920
Common Name(s):
English Alajuela Knobtail

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii) ver 3.1
Year Published: 2009
Date Assessed: 2007-03-01
Assessor(s): Paulson, D. R.
Reviewer(s): Clausnitzer, V. & Kalkman, V. (Odonata Red List Authority)
E. subsimilis is known only from two localities about 10 km apart on the western slope of Cordillera Central, and is not found elsewhere after much recent collecting in Costa Rica. It is expected that the habitat will experience a continuing decline due to deforestation.
2006 Endangered (IUCN 2006)
2006 Endangered
1996 Endangered (Baillie and Groombridge 1996)
1996 Endangered
1994 Indeterminate (Groombridge 1994)
1990 Indeterminate (IUCN 1990)

Geographic Range [top]

Range Description: Epigomphus subsimilis is found in Costa Rica from the following areas:
Costa Rica: Alajuela, Turrúcares, Rio Siquiares, 670 m (Calvert 1920)
Costa Rica: San José, Reserva Forestal El Rodeo, 7 km W Colón (Ramírez 1996, R. W. Garrison collection)
Costa Rica: Puntarenas Province, 14 km SSW Monteverde, 355 m (W. Haber, pers. comm.)
Costa Rica
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: There is no information available to assess E. subsimilis population size or trend.
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: Presumably lowland rain-forest streams like most other Epigomphus. Type series taken in corn and banana fields near river, however. Males taken at swampy spring seep in forest, one patrolling small pool and another at forest edge. Known elevation range 355 - 670 m.
Systems: Terrestrial; Freshwater

Threats [top]

Major Threat(s): The deforestation of E. subsimilis habitat is presumed to continually affect its numbers, causing a decline in the population.

Conservation Actions [top]

Conservation Actions: One population lies within the protected area of Reserva Forestal El Rodeo. New studies are needed to confirm habitat status and population range of E. subsimilis.

Citation: Paulson, D. R. 2009. Epigomphus subsimilis. The IUCN Red List of Threatened Species. Version 2014.3. <>. Downloaded on 30 March 2015.
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