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Hiodontiformes (1945 words) |
 | The Hiodontiformes are represented by two extant species, Hiodon alosoides (goldeye) and Hiodon tergisus (mooneye), which occur in fresh waters, both lakes and streams, of the interior of North America east of the Rocky Mountains. |
| Living species of hiodontiforms are endemic to interior fresh waters of North America east of the Rocky Mountains. |
| Extinction must have been important in the Cenozoic history of the order (Li, Wilson, and Grande, 1997): the present endemic distribution of the Hiodontiformes is thus a remnant of a former widespread northern hemispheric distribution (Wilson and Williams, 1993). |
| Hiodontiformes (1945 words) |
| The earliest fossil Hiodontiformes thus far known in North America are Eocene species of †Eohiodon (Cavender, 1966; Wilson, 1978; Grande, 1979; Li, Wilson, and Grande, 1997). |
| This relationship is supported by at least two synapomorphies uniquely shared by these two genera in the Hiodontiformes sensu stricto Li and Wilson (1996): supraorbital canal ending in frontal, anal fin in male and female sexually dimorphic. |
| This is seen in all hiodontiform species and is also unique to the order (Li and Wilson, 1996a, in press; Li, Wilson, and Grande, 1997). |
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