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The island of Grande Terre split from the former supercontinent Gondwana around 80 million years ago, carrying Gondwanan species from a variety of clades with it. The island was periodically submerged until 37 million years ago, but some researchers suggest that its current biota includes species from clades predating the split that took refuge on islands near Grande Terre during submergence events and then returned.
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Thomas R. Buckley et al. found that the crown age— the age of the most recent common ancestor of all species in the clade (i.e., the clade's founder)—of Grande Terre's clade of stick insects is 41.1 million years, which is among the oldest clade crown ages of species inhabiting the island today. Nearly all of Grande Terre's living species belong to clades that originated much more recently: for example, the crown age of the island's clade of Goodeniaceae plants is 2.0 million years.
The island of Grande Terre split from the former supercontinent Gondwana around 80 million years ago, carrying Gondwanan species from a variety of clades with it. The island was periodically submerged until 37 million years ago, but some researchers suggest that its current biota includes species from clades predating the split that took refuge on islands near Grande Terre during submergence events and then returned.
Text 2
Thomas R. Buckley et al. found that the crown age— the age of the most recent common ancestor of all species in the clade (i.e., the clade's founder)—of Grande Terre's clade of stick insects is 41.1 million years, which is among the oldest clade crown ages of species inhabiting the island today. Nearly all of Grande Terre's living species belong to clades that originated much more recently: for example, the crown age of the island's clade of Goodeniaceae plants is 2.0 million years.