Ash-throated Casiornis

The ash-throated casiornis (Casiornis fuscus) is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is endemic to Brazil. == Taxonomy and systematics == The ash-throated casiornis was originally described with its current binomial Casiornis fuscus. Genus Casiornis had been erected in 1856. During the first half of the twentieth century many authors placed that genus in family Cotingidae but starting in the 1970s it was recognized as belonging to Tyrannidae. The ash-throated casiornis shares the genus with the rufous casiornis (C. rufus) and the two form a superspecies. For a time they were treated as conspecific but early in the twenty-first century they were firmly established as separate species. The ash-throated casiornis is monotypic. == Description == The ash-throated casiornis is 18 cm (7.1 in) long and weighs about 19.5 g (0.69 oz). The sexes have the same plumage. Adults have a rufous crown, a paler rufous face, a sandy brown back, and a rufous tail. Their wings are dusky with wide rufous to buff edges on the feathers. Their throat is pale grayish that becomes grayish fawn on the breast and pale creamy yellowish on the belly. They have a dark brown iris, a dark…