The Javan blue flycatcher (''Cyornis banyumas'') is a species of

bird Birds are a group of warm-blooded vertebrates constituting the class Aves (), characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweigh ...

in the family

Muscicapidae The Old World flycatchers are a large family, the Muscicapidae, of small passerine birds restricted to the Old World (Europe, Africa and Asia), with the exception of several vagrants and two species, Bluethroat (''Luscinia svecica)'' and Norther ...

. It is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

to the

Indonesian Indonesian is anything of, from, or related to Indonesia, an archipelagic country in Southeast Asia. It may refer to: * Indonesians, citizens of Indonesia ** Native Indonesians, diverse groups of local inhabitants of the archipelago ** Indonesian ...

islands of

Java Java (; id, Jawa, ; jv, ꦗꦮ; su, ) is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea to the north. With a population of 151.6 million people, Java is the world's List ...

and

Panaitan Panaitan (Prinsen, or Prince's Island; sometimes also Princess Island) (1450 m) is an island in the Sunda Strait, between Java and Sumatra, and in the Indonesian province of Banten. It is the largest island in the strait, and is located near the ...

. The

Dayak blue flycatcher The Dayak blue flycatcher (''Cyornis montanus'') is a species of bird in the family Muscicapidae. It is endemic to the island of Borneo Borneo (; id, Kalimantan) is the third-largest island in the world and the largest in Asia. At the ge ...

(''Cyornis montanus'') of

Borneo Borneo (; id, Kalimantan) is the third-largest island in the world and the largest in Asia. At the geographic centre of Maritime Southeast Asia, in relation to major Indonesian islands, it is located north of Java, west of Sulawesi, and eas ...

, which was formerly considered conspecific, was split as a distinct species by the

IOC The International Olympic Committee (IOC; french: link=no, Comité international olympique, ''CIO'') is a non-governmental sports organisation based in Lausanne, Switzerland. It is constituted in the form of an association under the Swiss ...

in 2021.

References

Javan blue flycatcher The Javan blue flycatcher (''Cyornis banyumas'') is a species of bird in the family Muscicapidae. It is endemic to the Indonesian islands of Java and Panaitan. The Dayak blue flycatcher (''Cyornis montanus'') of Borneo Borneo (; id, Kali ...

Taxa named by Thomas Horsfield Endemic fauna of Java Birds of Java {{Muscicapidae-stub