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Disparity in Diversity between Metatherians and Eutherians

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.

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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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