rastellum

noun2

1. •
   In certain mygalomorph spiders, a row of stiff spines on the chelicera.

   • The female has robust chelicerae with a rastellum. The fovea is a pit, not longitudinal as in Antrodiaetus. — 2012
2. •
   In honey bees, a row of spines on the distal end of the tibia used to manipulate pollen.