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Mesosaurus, Cynognathus, Lystrosaurus, and Glossopteris.
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Those four names are classic fossil taxa used as evidence for continental drift and the former supercontinent Gondwana. Briefly:
- Mesosaurus — small, freshwater aquatic reptile (early Permian, ~299–280 Ma). Fossils found in eastern South America and southern Africa. Because it was freshwater and unlikely to cross a wide ocean, its disjoint distribution strongly suggests the continents were joined.
- Cynognathus — carnivorous terrestrial synapsid (a cynodont; Middle Triassic, ~247–237 Ma). Bones and skulls occur in South America and Africa, supporting land connection.
- Lystrosaurus — herbivorous dicynodont therapsid (Early Triassic, ~251–245 Ma). Widely found in Africa, India, Antarctica and India; its wide southern distribution is explained by contiguous Gondwanan landmasses.
- Glossopteris — genus of seed fern (Permian–Triassic). Glossopteris leaves are abundant across South America, Africa, India, Australia and Antarctica. The plant’s seeds are not salt-tolerant, so their widespread occurrence implies contiguous southern continents.
Together these fossils provide strong biogeographic evidence that the southern continents were once joined (Gondwana), a key data set that helped establish plate tectonics/continental drift.
- Mesosaurus — small, freshwater aquatic reptile (early Permian, ~299–280 Ma). Fossils found in eastern South America and southern Africa. Because it was freshwater and unlikely to cross a wide ocean, its disjoint distribution strongly suggests the continents were joined.
- Cynognathus — carnivorous terrestrial synapsid (a cynodont; Middle Triassic, ~247–237 Ma). Bones and skulls occur in South America and Africa, supporting land connection.
- Lystrosaurus — herbivorous dicynodont therapsid (Early Triassic, ~251–245 Ma). Widely found in Africa, India, Antarctica and India; its wide southern distribution is explained by contiguous Gondwanan landmasses.
- Glossopteris — genus of seed fern (Permian–Triassic). Glossopteris leaves are abundant across South America, Africa, India, Australia and Antarctica. The plant’s seeds are not salt-tolerant, so their widespread occurrence implies contiguous southern continents.
Together these fossils provide strong biogeographic evidence that the southern continents were once joined (Gondwana), a key data set that helped establish plate tectonics/continental drift.
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