any member of the Chelonia, an ancient order of reptiles chiefly characterized by a shell that encloses the vital organs of the body and more or less protects the head and limbs, kilpkonnad, õigemini kilpkonnalised (Testudines), anapsiidide (Anapsida) alamklassi kuuluv luulise kilprüüga roomajate selts; 210-250 liiki