Scientists Finally Solve Mystery of Tiny, Ancient Worm’s ‘Mismatched’ Head and Body
The head of the arrow worm, Parasagitta elegans. This group of animals are the closest living relatives to Amiskwia. Credit: Rafael Martin Ledo/Consejería de Educación de Cantabría A microscopic worm that lived about 505 million years ago was a “patchwork” species with body parts that matched up to different worm families, confounding experts who tried to classify …
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