Margarornis is a genus of passerine birds in the ovenbird family Furnariidae. They are found in South and Middle America. All four species in the genus have "treerunner" in their English name.

Margarornis squamiger -NBII Image Gallery-a00214.jpg
Pearled treerunner, Margarornis squamiger
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Furnariidae
Genus: Margarornis
Reichenbach, 1853
Type species
Sittasomus perlatus
Pearled treerunner
Lesson, 1844

Margarornis bellulus
Margarornis rubiginosus
Margarornis squamiger
Margarornis stellatus


The genus Margarornis was introduced in 1853 by the German naturalist Ludwig Reichenbach.[1] The name combines the Ancient Greek margaron meaning "pearl" with ornis meaning "bird".[2] The type species was designated by George Robert Gray in 1855 as Sittasomus perlatus Lesson. This taxon is now considered to be a subspecies of the pearled treerunner (Margarornis squamiger perlatus).[3][4]


The genus contains four species:[5]

Image Scientific name Common Name Distribution
  Margarornis rubiginosus Ruddy treerunner Costa Rica and western Panama.
  Margarornis stellatus Star-chested treerunner Colombia and Ecuador.
Margarornis bellulus Beautiful treerunner Panama
  Margarornis squamiger Pearled treerunner Argentina, Bolivia, Colombia, Ecuador, Peru, and Venezuela

The white-throated treerunner is placed in the monotypic genus Pygarrhichas.[5]


  1. ^ Reichenbach, Ludwig (1853). "Icones ad synopsin avium No. 10 Scansoriae A". Handbuch der speciellen Ornithologie (in German). Dresden und Leipzig: Expedition Vollständigsten Naturgeschichte. pp. 145–218 [146, 179].
  2. ^ Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 241. ISBN 978-1-4081-2501-4.
  3. ^ Gray, George Robert (1855). Catalogue of the Genera and Subgenera of Birds Contained in the British Museum. London: British Museum. p. 28.
  4. ^ Peters, James Lee, ed. (1951). Check-List of Birds of the World. Vol. 7. Cambridge, Massachusetts: Museum of Comparative Zoology. p. 116.
  5. ^ a b Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (January 2021). "Ovenbirds, woodcreepers". IOC World Bird List Version 11.1. International Ornithologists' Union. Retrieved 29 June 2021.

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