The characteristics of Metatheria are given below:
1. Marsupium is preseent in females.
2. Mammary glands are developed. Marsypial bone is present.
3. Corcoid and Interelative are absent.
4. Epiphyses on vertebrae present.
5. Corapus callosum is poorly developed.
6. Vagina and uterus are double.
7. Placenta is absent.
9. Marsypial bone is present.