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SUMMARY

  • 1
    The larval Hynobius nebulosus during its ontogeny possesses a pair of hypoglossal foramina like Cryptobranchus.
  • 2
    A hypoglossal nerve comprising a dorsal and ventral root and a ganglino emerges through this foramen. It is thus a true spinal nerve, serially homologous with the more posterior ones which have been described.
  • 3
    The evidence supports the view that the posterior part of the urodele skull is composed of spinal segments.