Organisms that retain the larval form of their evolutionary ancestors when they are sexually mature are called

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Organisms that retain the larval form of their evolutionary ancestors when they are sexually mature are called paedomorphic. This is a common phenomenon in evolutionary biology, where certain traits or features are retained from ancestral species even though they may not be directly useful in the current environment. Paedomorphic organisms are often considered to be living fossils and can provide important insights into the evolutionary history of a particular group of organisms.

Organisms That Retain the Larval Form of Their Evolutionary Ancestors