''Papilio diophantus'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

swallowtail butterfly Swallowtail butterflies are large, colorful butterflies in the family Papilionidae, and include over 550 species. Though the majority are tropical, members of the family inhabit every continent except Antarctica. The family includes the large ...

from the

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

Papilio ''Papilio'' is a genus in the swallowtail butterfly family, Papilionidae, as well as the only representative of the tribe Papilionini. The word ''papilio'' is Latin for butterfly. It includes the common yellow swallowtail (''Papilio machaon''), ...

'' that is found in

Sumatra Sumatra is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the sixth-largest island in the world at 473,481 km2 (182,812 mi.2), not including adjacent i ...

Description

Upperside. Dark brown. Anterior wing broader and not so curved on the costal margin as in ''

Papilio helenus ''Papilio helenus'', the red Helen, is a large swallowtail butterfly found in forests of southern India and parts of southeast Asia. Range ''Papilio helenus'' is rarely found in Sri Lanka, southern and north-east India, Nepal, Bhutan, Banglad ...

'' , which it resembles on the upperside. Posterior wing with a tail more spatulate than in ''P. Helenus'', and tipped with cream colour,marked from the costal margin to the third hranch of the median

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