Spermathecal valve (sometimes called spermathecal pump) of honey bee queen. After Gessner and Ruttner (1977, fig. 2) Transfer der Spermatozoen in die Spermatheka der Bienenkönigin,
, Volume 8, Number 1, p.1-18, (1977)
[1]. (scale bar = 100 micrometers)
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