basioccipitoi 



Figure 247.— Xmftlyr/iync/iofes 

 riehei: lateral view of head, 

 59.4 mm SL, New Zealand. 





^roperculu 

 preoperculum 

 ectopterygoid \ rnetcpterygoid 

 symptectic 



less, this adds a confirmatory note to the hypothesized 

 ancestry of Canthigaster as being from among a group of 

 Carinotetraodon-Mk^ fishes. 



In contrast to the origin and anatomical speciali- 

 zations of the Canthigasterinae discussed above, the 

 diversity of the Tetraodontinae is far greater and more 

 complex. Before a consideration of the anatomical diver- 

 sity between genera can be undertaken, it is first 

 necessary to determine the diversity to be expected 



within genera, especially those with relatively large 

 numbers of species. With this in mind, as many species 

 of the systematically relatively well known and speciose 

 genera Sphoeroides and Lagocephalus have been ex- 

 amined as possible (11 of Sphoeroides and 6 of Lago- 

 cephalus, the recognition of the Atlantic species of the 

 former being greatly aided by the recent works of Shipp, 

 see literature cited). Sphoeroides occurs in the eastern 

 Pacific and Atlantic (mostly in the western Atlantic), 



