Grallaria ayacuchensis Hosner, Robbins, Isler, & Chesser,

Isler, Morton L., Chesser, Terry, Robbins, Mark B., Cuervo, Andrés M., Cadena, Carlos Daniel & Hosner, Peter A., 2020, Taxonomic evaluation of the Grallaria rufula (Rufous Antpitta) complex (Aves: Passeriformes: Grallariidae) distinguishes sixteen species, Zootaxa 4817 (1), pp. 1-74: 21-22

publication ID

https://doi.org/10.11646/zootaxa.4817.1.1

publication LSID

lsid:zoobank.org:pub:7CBDB6A9-9AF9-495F-A55A-83BF36A4934D

persistent identifier

http://treatment.plazi.org/id/465F87DE-FFAA-7446-FF07-FBEEFB16FC9C

treatment provided by

Plazi

scientific name

Grallaria ayacuchensis Hosner, Robbins, Isler, & Chesser
status

new species

Grallaria ayacuchensis Hosner, Robbins, Isler, & Chesser  , new species

Ayacucho Antpitta

Includes population designated blakei  3 in the analysis.

Diagnosis. Upperparts dark reddish yellow-brown; anterior underparts paler grading to light buff on lower belly. Trilled long songs in combination with short songs consisting of a regularly repeated unmodulated note distinguish G. ayacuchensis  ( Fig. 14View FIGURE 14) from all other populations except G. centralis  . Vocal differences between G. ayacuchensis  and G. centralis  include short song note shape (rounded in G. centralis  and downslurred in G. ayacuchensis  ) and pattern of change in duration of long song notes (notes lengthen or remain constant in G. centralis  and shorten in G. ayacuchensis  ). The pace of long songs of G. ayacuchensis  is faster than that of G. centralis  , and although ranges of values did not overlap, means did not differ significantly, presumably because of small sample sizes.

Distribution. Endemic to Peru on east Andean slope in Ayacucho west of the Río Apurímac between the Río

Mantaro and Río Pampas, 2500–3700 m.

Holotype. Centro de Ornitología y Biodiversidad ( CORBIDI) AV-KVG166. Adult male shot by P. A. Hosner in Chusquea  thicket in secondary forest, and prepared as a study skin by Karen Verde-Guerra, on 22 September 2012 at Chupón, Dpto. Ayacucho, Peru (13° 16’ S, 73°30’ W, elevation 3300 m). Voice recorded ( ML 186926View Materials).GoogleMaps 

Description of holotype. Adult male. Overall plumage of upperparts dark reddish yellow-brown (7.5YR 4/4), with throat and breast grading toward yellowish red-brown (5YR 5/8). Crown, auriculars, nape, back, rump, wing, uppertail coverts, and rectrices dark reddish yellow-brown (7.5YR 4/4). Remiges dark reddish yellow-brown (7.5YR 4/4) with the inner vane of each feather slightly duskier. Orbital, lores, throat, breast, side of breast, and upper flanks yellowish red-brown (5YR 5/8), grading to light buff on lower belly. Some feathers on belly have faint pale neutral gray mottling. Lower flanks grading to dark reddish yellow-brown (7.5YR 4/4), undertail coverts pinkish white (7.5YR 8/4). Testes 8 x 4 mm; skull 50% pneumatized; no bursa of Fabricius; stomach: insects; moderate fat, wt: 48.4 g; heavy contour feather molt. Iris dark brown, legs dusky gray, bill black.

Measurements of holotype. Bill length 12.7 mm, wing length 83.7 mm, tail length 41.3 mm, tarsus length 46.3 mm.

Paratopotypes. KU 132736View Materials (male), KU 132701View Materials (male), CORBIDI Av-MBR 8329 (male), CORBIDI Av- PAH1242 (male).

Paratypes. KU 119996View Materials (female), AMNH  820776 (male) (specimen photographs App. 6, Fig. A28).

Etymology. The scientific and English names reflect its restricted known distribution on the humid eastern slopes of the Department of Ayacucho, Peru.

Remarks. May also occur in adjacent northeastern Huancavelica. See remarks for G. centralis  . Holotype also cataloged as University of Kansas Biodiversity Institute (KU) 122629, tissue number 29375.

CORBIDI

Centro de Ornitologia y Biodiversidad

ML

Musee de Lectoure

KU

Biodiversity Institute, University of Kansas

AMNH

American Museum of Natural History

Kingdom

Animalia

Phylum

Chordata

Class

Aves

Order

Passeriformes

Family

Grallariidae

Genus

Grallaria