Acanthagrion taxaense 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Arthropoda Insecta Odonata Coenagrionidae

Scientific Name: Acanthagrion taxaense
Species Authority: Santos, 1965
Taxonomic Notes: Description (Santos 1965) does not fit with generic diagnosis of Acanthagrion - taxonomic revision needed (von Ellenrieder and Garrison 2007).

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii) ver 3.1
Year Published: 2009
Date Assessed: 2006-12-21
Assessor(s): von Ellenrieder, N.
Reviewer(s): Clausnitzer, V. & Paulson, D. (Odonata Red List Authority)
Known only from type locality, which is currently included in a park within Rio de Janeiro city (Santos 1965). Never recorded again, and therefore considered as extinct by Machado and Brescovit (2005), but that could be due to lack of surveys designed to find it which are urgently needed. Doubtful generic placement also needs to be analyzed.

Geographic Range [top]

Range Description: Found along east coast of Rio de Janerio in Brazil; known only from type series which included 40 males and 15 females collected over a lapse of 12 years (from 1953 - 1965; Santos 1965).
Countries occurrence:
Brazil (Rio de Janeiro)
Number of Locations: 1
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Population status is not known because the species has not been seen since its description in 1965.
Current Population Trend: Unknown
Additional data:
Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: Habitat includes ponds (Lagoa das Taxas, Santos 1965). Larva unknown.
Systems: Freshwater

Threats [top]

Major Threat(s): Urban development leading to habitat alteration by clearing of forest and pollution. Type locality, and only locality known so far, situated in an Ecological park (Chico Mendez) in populous Rio de Janeiro.

Conservation Actions [top]

Conservation Actions: Surveys needed to establish if species is still found at its original locality and if it is found elsewhere along eastern coast of Brazil and within protected areas.

Classifications [top]

5. Wetlands (inland) -> 5.7. Wetlands (inland) - Permanent Freshwater Marshes/Pools (under 8ha)
suitability: Suitable  
5. Wetlands (inland) -> 5.8. Wetlands (inland) - Seasonal/Intermittent Freshwater Marshes/Pools (under 8ha)
suitability: Unknown  
15. Artificial/Aquatic & Marine -> 15.2. Artificial/Aquatic - Ponds (below 8ha)
suitability: Suitable  major importance:Yes
1. Land/water protection -> 1.1. Site/area protection
1. Land/water protection -> 1.2. Resource & habitat protection
2. Land/water management -> 2.1. Site/area management

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
In-Place Species Management
In-Place Education
1. Residential & commercial development -> 1.1. Housing & urban areas
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

5. Biological resource use -> 5.3. Logging & wood harvesting -> 5.3.5. Motivation Unknown/Unrecorded
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

6. Human intrusions & disturbance -> 6.3. Work & other activities
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

9. Pollution -> 9.1. Domestic & urban waste water -> 9.1.3. Type Unknown/Unrecorded
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

9. Pollution -> 9.2. Industrial & military effluents -> 9.2.3. Type Unknown/Unrecorded
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

9. Pollution -> 9.5. Air-borne pollutants -> 9.5.2. Smog
♦ timing: Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

1. Research -> 1.1. Taxonomy
1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology
1. Research -> 1.5. Threats
1. Research -> 1.6. Actions
3. Monitoring -> 3.1. Population trends

Bibliography [top]

IUCN. 2009. IUCN Red List of Threatened Species (ver. 2009.2). Available at: (Accessed: 3 November 2009).

Machado, A.B.M. and Brescovit, A.D. 2005. Invertebrados terrestres. In: A.B.M. Machado, C.S. Martins and G.M. Dumont (eds), Lista da Fauna Brasileira Ameaçada de Extinção, incluindo as listas das Espécies Quase Ameçadas e Deficientes em Dados, pp. 157. Fundaçao Biodiversitas, Belo Horizonte.

Santos, N.D. 1965. Contribuição ao conhecimento da fauna do estado da Guanabara. LIV--Acanthagrion taxaensis spev. nov. (Odonata: Coenagrionidae). Atas da Sociedade de Biologia do Rio de Janeiro 9(4): 60-63.

Citation: von Ellenrieder, N. 2009. Acanthagrion taxaense. The IUCN Red List of Threatened Species 2009: e.T158924A5292963. . Downloaded on 25 May 2016.
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