Bay-capped Wren-Spinetail

The bay-capped wren-spinetail (Spartonoica maluroides) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Argentina, Brazil, Paraguay, and Uruguay. == Taxonomy and systematics == The bay-capped wren-spinetail is the only member of genus Spartonoica and has no subspecies. The bay-capped wren-spinetail was originally described as Synallaxis maluroides. It was later placed in genus Asthenes but has been recognized in Spartonoica starting in 1950. Genetic data show that it is not closely related to genus Asthenes but instead is sister to the cachalotes of genus Pseudoseisura. == Description == The bay-capped wren-spinetail is 13 to 14.5 cm (5.1 to 5.7 in) long and weighs about 10.5 g (0.37 oz). The sexes have the same plumage. Adults have a whitish supercilium on an otherwise sandy brown face. Their crown is rufous. Their upperparts are sandy brown to olive-brown with bold black streaks on the nape and upper back. Their wings are brown with cinnamon at the base of the flight feathers. Their tail is mostly brown and graduated with pointed feathers; the central pair have some black. Their underparts are whitish with a buff or cinnamon tinge on the breast, sides, and flanks.…