Diodon sp. (Linneaus 1758, 50cm) is the extant porcupinefish. The teeth are extremely tiny, lining beak-like jaws. The spines are distributed all over the body and skull. The circumorbital bones are also transformed into spines. Pelvic fins are absent. The tail is reduced. The pectoral fins provide thrt.

This taxon and the clade Tetraodontiformes (trunk fish and kin) nests between the piranha, Serrasalmus and the barracuda (Sphyrhaena).

Lagocephalus lagocephalus (Linneaus 1758, 60cm) is the extant pufferfish, capable of swallowing so much water into its stomach that it turns into a sphere. Here it nests with the equally talented, but spinier porcupine fish. Ribs and pelvic fins are absent. The postorbital, if that is what it is, is behind the eyeball here.

Mola mola (Linneaus 1758) is the extant ocean sunfish. As a hatchling it is similar to a porcupinefish (Diodon) in shape, then undergoes metamorphosis to adulthood. It is the largest bony fish and the only one taller than long. It is derived from the ocean puffer.