Comparative studies of neurodevelopment in cnidarians and bilaterians suggest that this process began with distinct integration centres that evolved on opposite ends of an initial nerve net.

Some have only a nerve net, like the closest relatives of bilaterians, the cnidarians (jellyfish and sea anemones). Others also have one or more nerve cords that are located dorsally, ventrally or ...

“We found fundamental differences between the nerve net of ctenophores and that of cnidarians and other animals. This is extremely exciting. One could argue: is it even a nervous system?” Pawel ...

Jellyfish include any planktonic marine member of the class Scyphozoa (phylum Cnidaria), which is a group ... they have two nervous systems. A large nerve net controls swimming and a small nerve ...