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Disparity in Diversity between Metatherians and Eutherians

Explore the remarkable differences in species and morphological diversity between Metatherians and Eutherians. Learn about the Trophoblast Hypothesis and key features of Metatherian neonates.

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Disparity in Diversity between Metatherians and Eutherians

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  1. Disparity in Diversity between Metatherians and Eutherians Species Diversity Metatherians: ~275 species (<5%) Eutherians: ~5125 species (>95%) Morphological Diversity Several fully aquatic species in two separate orders. No fully aquatic species. No species capable of powered flight. Bats have evolved powered flight.

  2. Trophoblast Hypothesis Blastocyst Stage Embryoblast – inner cell mass (Yellow) Trophoblast – Outer layer of cells (Red)

  3. Metatherian Neonate

  4. Wallaby embryo just before birth.

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