: one of two or more species that are nearly indistinguishable morphologically
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This research suggested that T. rex should have two sibling species -- a more slender Tyrannosaurus regina (tyrant lizard queen) and the stouter and toothier Tyrannosaurus imperator (tyrant lizard emperor).—Katie Hunt, CNN, 25 July 2022 The study team’s conclusion was that T. rex was not a single, unchanging dinosaur but may have had two equally terrifying sibling species.—Katie Hunt, CNN, 28 Feb. 2022
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