The yellow-margined flatbill or Zimmer's flatbill (''Tolmomyias assimilis'') is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of bird in the tyrant flycatcher family

Tyrannidae The tyrant flycatchers (Tyrannidae) are a family of passerine birds which occur throughout North and South America. They are considered the largest family of birds known to exist in the world, with more than 400 species. They are the most dive ...

. It is found in humid forest in southern

Central America Central America ( es, América Central or ) is a subregion of the Americas. Its boundaries are defined as bordering the United States to the north, Colombia to the south, the Caribbean Sea to the east, and the Pacific Ocean to the west. ...

, and the Chocó and

Amazon Amazon most often refers to: * Amazons, a tribe of female warriors in Greek mythology * Amazon rainforest, a rainforest covering most of the Amazon basin * Amazon River, in South America * Amazon (company), an American multinational technology c ...

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a relatively small portion in the Northern Hemisphere at the northern tip of the continent. It can also be described as the southe ...

. There are significant differences (notably voice) between the populations east and west of the

Andes The Andes, Andes Mountains or Andean Mountains (; ) are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range is long, wide (widest between 18°S – 20°S ...

, leading to suggestions that the two should be regarded as separate species, in which case the population west of the Andes retains the English name yellow-margined flatbill (or flycatcher) but with the

scientific name In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...

''T. flavotectus'', while the Amazonian population retains the scientific name ''T. assimilis'' but with the English name Zimmer's flatbill (or flycatcher). Both population closely resemble the

yellow-olive flatbill The yellow-olive flatbill or yellow-olive flycatcher (''Tolmomyias sulphurescens'') is a species of bird in the family Tyrannidae. It is found in tropical and subtopical forest and woodland in Central and South America, but over its range there a ...

, and are typically best separated from that species by voice.

References

External link

Xeno-canto: audio recordings of Zimmer's flatbill
Tolmomyias Birds of the Amazon Basin Birds of the Guianas Birds described in 1868 Birds of Brazil Taxonomy articles created by Polbot {{Tyrannidae-stub