Colugo and Eutherian

Colugo noun - Arboreal nocturnal mammal of southeast Asia and the Philippines resembling a lemur and having a fold of skin on each side from neck to tail that is used for long gliding leaps.

Eutherian and colugo are semantically related. In some cases you can use "Eutherian" instead a noun "Colugo".

Eutherian noun - Mammals having a placenta; all mammals except monotremes and marsupials.

Colugo and eutherian are semantically related. Sometimes you can replace term "Colugo" with "Eutherian", this nouns are similar.