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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 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 identity of the bird described from Paraguay by Félix de Azara as No. 372 Ypacahá del Pardo is confirmed as the immature plumage of the Spotted Rail Pardirallus maculatus maculatus (Boddaert, 1783). This description is the basis for the name Rallus rytirhynchos Vieillot, 1819 which is thus a junior subjective synonym and an available name. Rallus rytirhynchos Vieillot, 1819 is the type species of the genus Ortygonax Heine, 1890. Ortygonax Heine, 1890 is a junior subjective synonym of Pardirallus Bonaparte, 1856 and is also available for application.
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