| Combined with their occasionally distinctive morphologies, it would appear that they represent structures ontogenetically and functionally distinct from the botuliform cells. |
| In some species, males facultatively or ontogenetically switch between these tactics, and in other species the tactics appear to be fixed for an individual's lifetime. |
| It disappears most rapidly after the beginning of absolute disuse both ontogenetically and phylogenetically. |
| This is obvious but important, because if camerae can be derived from fossae ontogenetically then they can also be derived from fossae phylogenetically. |
| Regarding the marked size decrease of maxillary to premaxillary teeth, it seems likely that relative size of the teeth is allometrically and ontogenetically controlled. |
| Thus, the resultant planktonic cephalopods are probably trapped, either evolutionarily or ontogenetically. |
