Adenomera lutzi 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Amphibia Anura Leptodactylidae

Scientific Name: Adenomera lutzi Heyer, 1975
Common Name(s):
English Lutz's Tropical Bullfrog
Leptodactylus lutzi (Heyer, 1975)
Taxonomic Source(s): Frost, D.R. 2013. Amphibian Species of the World: an Online Reference. Version 5.6 (9 January 2013). Electronic Database. American Museum of Natural History, New York, USA. Available at:

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii) ver 3.1
Year Published: 2018
Date Assessed: 2017-11-15
Assessor(s): IUCN SSC Amphibian Specialist Group
Reviewer(s): Luedtke, J.
Contributor(s): Hoogmoed, M.S., Gaucher, P., Kok, P., Reynolds, R. & MacCulloch, R.
Facilitator/Compiler(s): Jarvis, L., Hobin, L.
Listed as Endangered because its extent of occurrence (EOO) is 3,704 km2, it occurs in fewer than five threat-defined locations, and there is ongoing decline in the extent and quality of habitat.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species was originally known from three localities in Mazaruni-Potaro District, Guyana. In his description of the species, Heyer (1975) gave the type locality of Chinapoon River (at about 300 m asl) on the upper Potaro River, and a second locality as Demerara Falls (it has not been possible to map this locality in this assessment as its exact location is unknown). Additional specimens were collected in October 2000 at 1,500 m asl on Mount Ayanaganna in the Pakaraima Mountains, also in Potaro-Mazaruni District, Guyana (MacCulloch and Lathrop 2002). Heyer (1975) suggested that the Chinapoon River in the description of the type locality probably referred to Chenapowu River. Chenapowu (also referenced as Chenapou and Chenapau) is a river and a village on the upper Potaro River. Kok et al. (2007) reported records from Kaieteur National Park, Mount Ayanganna, Mount Wokomung and the Merume Mountains in the Pakaraima Mountains region of Guyana. The extent of occurrence (EOO) of its current known range is 3,704 km2 and its range is thought to represent between 1-5 threat-defined locations.
Countries occurrence:
Additional data:
Number of Locations:1-5
Lower elevation limit (metres):430
Upper elevation limit (metres):1500
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species may be locally common (Kok et al. 2007, R. MacCulloch pers. comm. October 2017). Due to ongoing decline in the extent and quality of habitat, the population is suspected to be decreasing.
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species inhabits lowland and montane tropical primary forest. It is a mostly nocturnal species, inhabiting leaf litter. Reproduction seems to be constrained to the wettest months of the year. Gravid females have been found to contain 3-10 large white eggs (Kok et al. 2007).
Continuing decline in area, extent and/or quality of habitat:Yes
Movement patterns:Not a Migrant

Use and Trade [top]

Use and Trade: There are no records of this species being utilized.

Threats [top]

Major Threat(s): This species occurs in a large area of undisturbed remote forest (R. MacCulloch pers. comm. October 2017) and the habitat is relatively pristine. However, gold mining is occurring within Kaiteur National Park, on Mount Ayanganna and around the base of Wokomung massif and could be affecting the habitat of this species (P. Kok pers. comm. November 2017).

Conservation Actions [top]

Conservation Actions: Conservation Actions
The known locality in the Chinapau River area is within an indigenous reserve, affording some level of protection. It also occurs in Kaieteur National Park (Kok et al. 2007).

Conservation Needed
Improved habitat protection and management is required.

Classifications [top]

1. Forest -> 1.6. Forest - Subtropical/Tropical Moist Lowland
suitability:Suitable season:resident major importance:Yes
1. Forest -> 1.9. Forest - Subtropical/Tropical Moist Montane
suitability:Suitable season:resident 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
  Occur in at least one PA:Yes
In-Place Species Management
In-Place Education
3. Energy production & mining -> 3.2. Mining & quarrying
♦ timing:Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

Bibliography [top]

Heyer, W.R. 1975. Adenomera lutzi (Amphibia: Leptodactylidae), a new species of frog from Guyana. Proceedings of the Biological Society of Washington 88: 315-318.

IUCN. 2018. The IUCN Red List of Threatened Species. Version 2018-1. Available at: (Accessed: 28 June 2018).

Kok, P.J.R., Kokubum, M.N.C., MacCulloch, R.D. and Lathrop, A. 2007. Morphological variation in Leptodactylus lutzi (Anura, Leptodactylidae) with description of its advertisement call and notes on its courtship behavior. Phyllomedusa 6(1): 45-60.

Citation: IUCN SSC Amphibian Specialist Group. 2018. Adenomera lutzi. The IUCN Red List of Threatened Species 2018: e.T56310A120110512. . Downloaded on 14 August 2018.
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