Sentence:  The pollen detached by the <WSD>rastellum</WSD> falls on the surface of the auricle and adheres to it. Then by an upward flexion of the basitarsus on the tibia, the pollen on the auricle, held in place by the <WSD>rastellum</WSD>, is pressed up into the lower end of the tibial basket. 
Meaning of the word marked with <WSD> tags:  In honey bees, a row of spines on the distal end of the tibia used to manipulate pollen.