Sirian partnered with Rissa while the guards fanned out around them, one alert while the other four paired up to spar.
The collarcavity (b.c. 2) is paired, although its ventral mesentery is not complete.
Uzel, with the majority of students, regards the paired organs as mandibles and the unpaired as an epipharynx.
Hinds believe that the paired piercers are the inner lobes of the maxillae, and the unpaired piercer the left mandible, the right mandible being absent.
He therefore regards it as the inner lobe (lacinia) of that maxilla, comparing it with the remarkable " pick " of the maxilla of a book-louse (see Copeognatha in article Neuroptera), The paired piercers, connected by muscles with the base of the maxillae, but attached directly to the head skeleton, into which they can be withdrawn, are regarded by Borner as true mandibles.
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