Sentence:  ... in the typical mastax of a Brachionus there are two hammer-like bodies (<WSD>mallei</WSD>), which work on a kind of split anvil (incus); [...] each <WSD>malleus</WSD> consists of an upper part or head (uncus) and a lower or handle (manubrium); 
Meaning of the word marked with <WSD> tags:  One of the paired calcareous structures within the mastax of rotifers.