Azara’s spinetails II: what is No. 239 “Cola aguda cola sanguina”?

Abstract

The identity of Azara's No. 239 "Cola aguda cola sanguina" has never been convincingly elucidated and the only previous proposed identity as Plain-crowned Spinetail Synallaxis gujanensis is demonstrably incorrect. Azara provides a brief and imperfect, but diagnostic description of a bird which is clearly in the genus Synallaxis, of which eight species occur in Paraguay. The description of the crown being concolorous with the upperparts, the wing and tail pattern, and the measurements provided are sufficient to eliminate all species as candidates except the Grey-bellied Spinetail Synallaxis cinerascens, a common bird of Paraguayan Atlantic forests in the Oriental region of the country. To my knowledge, no scientific names have been proposed on the basis of this description.

The importance of acoustic background modelling in CNN-based detection of the neotropical White-lored Spinetail (Aves, Passeriformes, Furnaridae)

“…White-lored Spinetail was selected as the target species because it is a common bird in our study area (Brazilian Pantanal, see next section), and there is very limited knowledge about its ecology (Rubio and Pinho 2008). The Spinetail shows a distribution range restricted to the Pantanal and the borders of Humid Chaco of Bolivia and Paraguay (Smith 2020). We therefore consider it interesting to improve our knowledge of the vocal behavior of such a restricted range species.…”