Figure 217.— External features of 



other representative tetraodontid genera: 



Arothron armilla (above) and 



A. immaculatus— in both cases, upper 



left, nasal region as seen externally 



and, lower left, scales from upper 



middle region of body (nasal epithelium 

 of A. immaculatus pitted as shown; 

 that of A, armilla, not exposed in 

 the illustration, is only a slightly 

 irregular medial surface of the 

 single simple nasal flap). 



Figure 218.— External features of 



other representative tetraodontid 



genera: A, Tetraodon miurug, 



B, T. lineatua. C, T. kretamensis, and 



D, T. achoutedeni— in all cases, upper 



left, nasal region as seen externally 



(with inset below for T. schoutedeni 



showing the pitted nasal epithelium) 



and, lower left, scales from upper 



middle region of body. 



