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The weirdest mammal clade: they lay fucking eggs. Only 5 known species alive as of 2020.
Eggs are basal: they simply didn't evolve out of what other reptiles do. From which we conclude that milk came before eggs stopped.
So this is the most basal subclade of mammals.
Etymology: means "single hole" in Greek, because like other reptiles it has a single hole for shit, pee and fucking: the cloaca.

Ancestors

  1. Mammal subclade
  2. Mammal
  3. Synapsid subclade
  4. Synapsid
  5. Amniote subclade
  6. Amniote
  7. Tetrapod subclade
  8. Tetrapod
  9. Fish subclade
  10. Fish
  11. Vertebrate
  12. Chordate subclade
  13. Chordate
  14. Animal subclade
  15. Animal
  16. Eukarya subclade
  17. Eukaryote
  18. Species
  19. Taxonomy
  20. Biology
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