Light and scanning electron microscopy were used to study the morphology and histology of lateral line system in the Yunnan caecilian Ichthyophis bannanica.
The lateral line organs in Ichthyophis bannanica
included mechanoreceptive neuromasts and electroreceptive ampullary organs. Neuromasts included surface neuromasts and pit organs. Distinct series on head region included the nasal, supraorbital, infraorbital, postorbital, oral, mandibular, gular, supraspiracular series and pair of dorsal line on the body. The density, size, sunk depth of the lateral line organs directly correlated with surrounding epidermal height and regions. In larval, the retrogression of the lateral line organs was simultaneous with the retrogression of the spiracular. Juveniles did not retain the system. The distribution pattern and organ structure of the lateral line system in Ichthyophis bannanica
was similar to that of the other caecilians, the only noticeable difference involves the distribution of the organs in the supraorbital and infraorbital series [Acta Zoologica Sinica
53(2): 346 –353, 2007].