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This species is the sister species of Apis koschevnikovi, and both are in the same subgenus as the Western (European) honey bee, Apis mellifera.
C. tubularis and its sister species, C. verrilli, are the only hermit crabs known to show sexual dimorphism in shell choice, with males using normal marine gastropod shells, while females use shells of gastropods in the family Vermetidae, which are attached to rocks or other hard substrates.
The name was long used for the Large Skipper of Europe, but it actually refers to its Far Eastern sister species and the Large Skipper is now called O. sylvanus.
Alpinacris tumidicauda has a "sister species", Alpinacris crassicauda.
The species name is derived from Greek anatole (meaning sunrise or east) and refers to the eastern distribution of this taxon, which contrasts with its western sister species Disphragis tricolor.
Drosophila persimilis is a species of fruit fly that is a sister species to D. pseudoobscura, and was one of 12 fruitfly genomes sequenced for a large comparative study.
Graphium evemon, a sister species commonly known as the Lesser Jay but sometimes also referred to as the Pale Green Triangle