noun
East Pacific green turtle; black sea turtle
Refers specifically to the subspecies Chelonia mydas agassizii, also known as the black sea turtle. A biological term; in everyday contexts, it may simply be called a sea turtle.
クロウミガメは東太平洋に生息する。
The black sea turtle inhabits the eastern Pacific.
水族館でクロウミガメを見た。
I saw a black sea turtle at the aquarium.
Refers to the green sea turtle (Chelonia mydas) in general, while クロウミガメ is the East Pacific subspecies.
Compound of 黒 (kuro, 'black') + 海亀 (umigame, 'sea turtle'), describing the turtle's darker coloration.