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Specifically, the team found that the chordate nervous system, such as those in humans, evolved from an embryonic region of the ancestor that corresponds to echinoderm ciliary bands (Fig. 3).

Researchers have long puzzled over the peculiar innards of an ancient sea creature. A new study says scientists were looking at the Pikaia fossil the wrong way.

To address these questions, I am using the invertebrate chordate Ciona. Ciona with its fast development and fixed lineages, is an incredible model. During metamorphosis, most of the Ciona larval ...

She was fascinated by the presence of nervous system genes in this primitive, disk-shaped metazoan, she said. "This guy was much more interesting than a sponge," said Smith, who has been married ...