Examples of monotreme in the following topics:
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- Living mammals can be classified in three subclasses: eutherian, metatherians and monotremes.
- Living mammals can be classified into three major classes: eutherians, monotremes, and metatherians.
- Monotremes form their sister clade.
- Monotremes are unique among mammals as they lay eggs rather than giving birth to live young.
- Additionally, monotremes have no teeth.
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- Synapsids from this period include Dryolestes (more closely related to extant placentals and marsupials than to monotremes) as well as Ambondro (more closely related to monotremes).
- One of the major differences between placental and nonplacental eutherians is that placentals lack epipubic bones, which are present in all other fossil and living mammals (marsupials and monotremes).
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- Most mammals do not lay eggs (except for monotremes).
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- While male monotremes and eutherians possess mammary glands, male marsupials do not.