Cyphorhinus griseolateralis Ridgway, 1888

Bocalini, Fernanda & Silveira, Luís Fábio, 2016, A taxonomic revision of the Musician Wren, Cyphorhinus arada (Aves, Troglodytidae), reveals the existence of six valid species endemic to the Amazon basin, Zootaxa 4193 (3), pp. 541-564 : 553-554

Cyphorhinus griseolateralis Ridgway, 1888

English name: Gray-flanked Wren

Portuguese name: Uirapuru-dos-flancos-cinza

Type-locality: Diamantina, near Santarém, east of the mouth of Rio Tapajós , Pará, Brazil.

Diagnosis: presence of a partial grey (M 10YR 5/1) and white (M 5Y 8/1) streaked collar from the sides of the neck to the upper shoulders, less conspicuous than in C. arada ; white (M 5Y 8/1) superciliary stripe and greyishbrown (M 10YR 5/2, 5/3) belly.

Voice: diagnosed by the presence of a trill, otherwise the song consists of a set of simple phrases, with each having at least a single trill and several short notes at the beginning and/or end of the phrase. The same phrase type is repeated over a long period of time.

Distribution: southern bank of the Amazon River, from the eastern bank of Rio Tapajós to the western bank of Rio Xingu as well as Marajó Island ( Figure 4 ).

We found considerable individual variation in the plumage of C. modulator . The color of the belly, flanks and crissum varied from rufous to brownish. With respect to the color of the auriculars, scattered specimens from eastern Peru and central Bolivia have yellowish red with grayish brown instead of only yellowish red (i.e. AMNH 240687, AMNH 240688), somewhat intermediate between C. modulator and C. salvini . Several specimens of C. interpositus and C. griseolateralis also showed this variation in the coloration of the auriculars. In Cyphorhinus interpositus , the color of the superciliary stripe also varied, with scattered individuals from throughout the Machado-Aripuanã interfluve having the supercilium reddish yellow anteriorly, becoming whitish posteriorly. In addition, the auriculars from this region are not as red as in other individuals of the species, being closer to grayish brown, as already noted by Hellmayr (1910) and Naumburg (1930). However, these characters are not present in all individuals from this interfluve, with many specimens having the typical C. interpositus coloration, preventing us from considering these individuals a new taxon. In C. griseolateralis , individual variation was found in scattered specimens from throughout its range in breast color (reddish brown to grayish brown) and the conspicuousness of the streaks on the collar, as discussed below.

Figures

FIGURE 4. Distribution of recognized species within the Cyphorhinus arada complex. Black symbols represents skins and white symbols represents tape recordings. Cyphorhinus arada: triangles; Cyphorhinus transfluvialis: pentagons; Cyphorhinus salvini: squares; Cyphorhinus modulator: circles; Cyphorhinus interpositus: inverted triangles; Cyphorhinus griseolateralis: diamonds. Stars represent the type locality of each species. Illustrations by Laura Montserrat and Michelle Konig.