Chelonia

Chelonia is a name for the whole order of turtles, and for a particular turtles:

Chelonia, a name for all turtles. Nowadays Testudines is often preferred.
Chelonia mydas, the Green sea turtle.

Sources

↑ Dubois, A.; Bour, R. (2010). "The distinction between family-series and class-series nomina in zoological nomenclature, with emphasis on the nomina created by Batsch (1788, 1789) and on the higher nomenclature of turtles" (PDF). Bonn Zoological Bulletin. 57 (2): 149–171. ISSN 0006-7172. Archived from the original (PDF) on 2014-09-01. Retrieved 2014-05-15.

This disambiguation page lists articles that are about something that can be called Chelonia.
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[1] Dubois, A.; Bour, R. (2010). "The distinction between family-series and class-series nomina in zoological nomenclature, with emphasis on the nomina created by Batsch (1788, 1789) and on the higher nomenclature of turtles" (PDF). Bonn Zoological Bulletin. 57 (2): 149–171. ISSN 0006-7172. Archived from the original (PDF) on 2014-09-01. Retrieved 2014-05-15.