| Untitled Document (1337 words) |
 | The major orders within the ostariophysians are the Gonorhynchiformes, Cypriniformes, Characiformes, Siluriformes, and the Gymnotiformes. |
| These attributes would seem to promote occupancy of a variety of niches and food resources as well as rapid response to environmental change via early ages at maturity. |
| Gonorhynchiformes: these are a small group (about 40 spp.) of largely freshwater fish (s few are brackish water or marine) that lack teeth on the jaws, have an epibranchial organ (for processing planktivorous prey), and have the first 3 vertebrae modified into what appears to be the precursory stage of the true Weberian apparatus. |
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