Karl Bleyl (4 December 1908 – 28 April 1995) was an amateur German entomologist who specialised in Hymenoptera.
His collection of Hymenoptera (Apoidea) is held by the German Entomological Institute.
[1] Bleyl was born on Gut Seeben near Halle, Germany.
Bleyl was influenced by entomologist and Hymenoptera researcher Ernst Heidenreich.
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