Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Cladus: Avemetatarsalia
Cladus: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauriformes
Cladus: Dracohors
Cladus: Dinosauria
Cladus: Saurischia
Cladus: Eusaurischia
Subordo: Theropoda
Cladus: Neotheropoda
Cladus: Averostra
Cladus: Tetanurae
Cladus: Avetheropoda
Cladus: Coelurosauria
Cladus: Tyrannoraptora
Cladus: Maniraptoromorpha
Cladus: Maniraptoriformes
Cladus: Maniraptora
Cladus: Pennaraptora
Cladus: Paraves
Cladus: Eumaniraptora
Cladus: Avialae
Infraclassis: Aves
Cladus: Avebrevicauda
Cladus: Pygostylia
Cladus: Ornithothoraces
Cladus: Ornithuromorpha
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Cladus: Neoaves
Cladus: Telluraves
Cladus: Australaves
Ordo: Passeriformes
Subordo: Tyranni
Infraordo: Tyrannides
Parvordo: Furnariida
Superfamilia: Furnarioidea
Familia: Furnariidae
Genus: Margarornis
Species: Margarornis bellulus
Name
Margarornis bellulus Nelson, 1912
Type locality: Cerro Pirre, 4500 feet [c. 1370 m], near head of Río Limón, Darién, Panama.
References
Primary references
Nelson, E.W. 1912. Descriptions of New Genera, Species and Subspecies of Birds from Panama, Colombia and Ecuador. Smithsonian miscellaneous collections 60(3): 1–25 BHL Reference page. Original description p.12 BHL
Links
IUCN: Margarornis bellulus (Near Threatened)
Vernacular names
English: Beautiful Treerunner
español: Subepalo bonito
The beautiful treerunner (Margarornis bellulus) is a Near Threatened species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is endemic to Panama.[2][1]
Taxonomy and systematics
Some authors have proposed that the beautiful treerunner and the pearled treerunner (M. squamiger) are conspecific or sister species, but these treatments were disproven in a 2011 publication.[3]
The beautiful treerunner is monotypic.[2]
Description
The beautiful treerunner is 14 to 15 cm (5.5 to 5.9 in) long and weighs 18 to 19 g (0.63 to 0.67 oz). The sexes have the same plumage. Adults have a buffish-white supercilium that extends to the nape, a dull reddish brown line behind the eye, dark brown ear coverts with whitish streaks, and a dark brown "moustache" with white spots that become stripes toward the neck. Their crown is olive brown and their upperparts and wing coverts warm olive-brown. Their flight feathers are dark fuscous with tawny-ochraceous edges. Their tail is dull reddish brown; the ends of the tail feathers lack barbs, giving a spiny appearance. Their throat is whitish and the rest of their underparts rufescent brown. Their upper breast has whitish oval spots with dark brown rims that become narrow stripes on the belly. Their iris is brown, their maxilla brownish, their mandible pinkish, and their legs and feet gray.[4]
Distribution and habitat
The beautiful treerunner has a disjunct distribution within Panama. It is found in the Serranía de Majé of Panamá Province and in several ranges in the extreme east of Darién Province. It inhabits montane evergreen forest, mostly at elevations between 1,350 and 1,600 m (4,400 and 5,200 ft) but in a few places as low as 900 m (3,000 ft).[4]
Behavior
Movement
The beautiful treerunner is a year-round resident throughout its range.[4]
Feeding
The beautiful treerunner feeds on arthropods. It usually forages as part of a mixed-species feeding flock. It acrobatically moves through the forest's subcanopy, gleaning prey from branches and epiphytes, sometimes while hanging upside down.[4]
Breeding
Nothing is known about the beautiful treerunner's breeding biology.[4]
Dickcissel male perched on a metal pole singing, with neck stretched and beak open.
Songs and calls
Listen to beautiful treerunner on xeno-canto
Vocalization
As of September 2023, xeno-canto and the Cornell Lab of Ornithology's Macaulay Library each had a single recording of a beautiful treerunner call and none of its song.[4]
Status
The IUCN has assessed the beautiful treerunner as Near Threatened. It has a very small range and an unknown population size, though the latter is believed to be stable. "Habitat in the region is being cleared and degraded for mining, agriculture and cultivation of coca", and because it is a high elevation species "it could be vulnerable to global climate change".[1] All of its known locations in Darién Province are within Darién National Park.[4]
References
BirdLife International (2020). "Beautiful Treerunner Margarornis bellulus". IUCN Red List of Threatened Species. 2020: e.T22702726A179423243. doi:10.2305/IUCN.UK.2020-3.RLTS.T22702726A179423243.en. Retrieved 9 September 2023.
Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (July 2023). "Ovenbirds, woodcreepers". IOC World Bird List. v 13.2. Retrieved July 31, 2023.
Derryberry, E. P., S. Claramunt, G. Derryberry, R. T. Chesser, J. Cracraft, A. Aleixo, J. Pérez-Emán, J. V. Remsen, Jr., and R. T. Brumfield. (2011). Lineage diversification and morphological evolution in a large-scale continental radiation: the Neotropical ovenbirds and woodcreepers (Aves: Furnariidae). Evolution 65(10):2973–2986. https://doi.org/10.1111/j.1558-5646.2011.01374.x
Remsen, Jr., J. V. and C. J. Sharpe (2020). Beautiful Treerunner (Margarornis bellulus), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.beatre1.01 retrieved September 9, 2023
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