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The bulbus is a part of the unique functional penis (endophallus) in the genus Apis and was studied in Apis mellifera drones. The bulbus consists of a thin cuticular membrane, covered by four different epithelia (dorsal epithelium, anterior epithelium, ventral epithelium I and ventral epithelium II). One day before eclosion, pupae have no sclerotised plates in the bulbus lumen. In emerging drones,...
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