The Curve-billed Reedhaunter (Limnornis curvirostris) is a species of bird

Bird

Birds are feathered, winged, bipedal, endothermic , egg-laying, vertebrate animals. Around 10,000 living species and 188 families makes them the most speciose class of tetrapod vertebrates. They inhabit ecosystems across the globe, from the Arctic to the Antarctic. Extant birds range in size from...

 in the Furnariidae family. It is found marshy areas of north-eastern Argentina

Argentina

Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

, south-eastern Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

, and Uruguay

Uruguay

Uruguay ,officially the Oriental Republic of Uruguay,sometimes the Eastern Republic of Uruguay; ) is a country in the southeastern part of South America. It is home to some 3.5 million people, of whom 1.8 million live in the capital Montevideo and its metropolitan area...

. It occupies a similar ecological niche

Ecological niche

In ecology, a niche is a term describing the relational position of a species or population in its ecosystem to each other; e.g. a dolphin could potentially be in another ecological niche from one that travels in a different pod if the members of these pods utilize significantly different food...

 to some reed warblers

Acrocephalus

The Acrocephalus warblers are small, insectivorous passerine birds belonging to the genus Acrocephalus. Formerly in the paraphyletic Old World warbler assemblage, they are now separated as the namesake of the marsh- and tree-warbler family Acrocephalidae...

.

The Curve-billed Reedhaunter is placed in the monotypic

Monotypic

In biology, a monotypic taxon is a taxonomic group with only one biological type. The term's usage differs slightly between botany and zoology. The term monotypic has a separate use in conservation biology, monotypic habitat, regarding species habitat conversion eliminating biodiversity and...

 genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 Limnornis. The superficially similar Straight-billed Reedhaunter

Straight-billed Reedhaunter

The Straight-billed Reedhaunter is a South American bird species in the family Furnariidae. It is today placed in the monotypic genus Limnoctites....

 is sometimes also included in Limnornis, but evidence suggests it is closer to Cranioleuca

Cranioleuca

The typical spinetails, Cranioleuca, are a genus of birds in the Furnariidae family. It may include the Straight-billed Reedhaunter.-Species:* Creamy-crested Spinetail, Cranioleuca albicapilla...

spinetails than it is to the Curve-billed Reedhaunter.

Additionally, the name Limnornis was also mistakenly given to fossil

Fossil

Fossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...

s from Romania

Romania

Romania is a country located at the crossroads of Central and Southeastern Europe, on the Lower Danube, within and outside the Carpathian arch, bordering on the Black Sea...

, but these remains have since been reclassified as Eurolimnornis

Eurolimnornis

Eurolimnornis is the name given to a monotypic genus of fossil bird from the Early Cretaceous. E. corneti probably was a primitive, but essentially modern bird and may indeed be an early neognathe ancestral to the grebes, although the alternative theories that it was a theropod or pterosaur or a...

and Palaeocursornis

Palaeocursornis

Palaeocursornis is a monotypic genus of prehistoric bird. The species P. corneti, described in 1984, was initially assumed to be a flightless paleognathe, possibly a ratite, but it may actually be more primitive and not even a neornithine but an ornithuromorph bird or indeed not a bird at all...