LC
Yellow-margined Flatbill Tolmomyias assimilis



Taxonomy

Taxonomic note
Tolmomyias assimilis and T. flavotectus (del Hoyo and Collar 2016) were previously lumped as T. assimilis (see AOU [1998 & supplements], SACC [2005 & updates], Sibley & Monroe [1990, 1993] and Stotz et al. [1996]).

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2016 Least Concern
Species attributes

Migratory status not a migrant Forest dependency High
Land mass type Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 6,880,000 medium
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals unknown not applicable not applicable 0
Population trend Decreasing suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations - - -
Largest subpopulations - - -
Generation length (yrs) 3.6 - - -

Population justification: The global population size has not been quantified, but this species is described as 'fairly common' (Stotz et al. (1996).


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Bolivia N Extant Yes
Brazil N Extant Yes
Colombia N Extant Yes
Ecuador N Extant Yes
French Guiana N Extant Yes
Guyana N Extant Yes
Peru N Extant Yes
Suriname N Extant Yes
Venezuela N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Swamp major resident
Altitude 0 - 1200 m Occasional altitudinal limits  

Recommended citation
BirdLife International (2019) Species factsheet: Tolmomyias assimilis. Downloaded from http://www.birdlife.org on 17/10/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 17/10/2019.