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Colymboides : ウィキペディア英語版
Colymboides

The genus ''Colymboides'' contains three species of early loon dating from the late Oligocene or early Miocene. They are considered to be the earliest known unambiguous gaviiform fossils. The genus is widely known from early Priabonian – about in the Late Eocene – to Early Miocene (late Burdigalian, less than ) limnic and marine rocks of western Eurasia north of the Alpide belt, between the Atlantic and the former Turgai Sea. It is usually placed in the Gaviidae already, but usually in a subfamily Colymboidinae, with the modern-type loons making up the Gaviinae. But the ''Colymboides'' material is generally quite distinct from modern loons, and may actually belong in a now-extinct family of primitive gaviiforms. The best studied species, ''Colymboides minutus'', was described by Robert Storer as being much smaller than modern loons and not as well adapted to diving.
==Notes==


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