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.
In the Aglossal Xenopus, the tadpoles are likewise devoid of circular lip, horny teeth, and beak, and they are further remarkable in the following respects: There is a long tentacle or barbel on each side of the mouth, which appears to represent the "balancer" of Urodele larvae; the spiraculum is paired, one on each side; the fore limbs develop externally, like the hind limbs.
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