Longfin squid embryos at a late stage of development.

The brains of squid and humans evolve in the same way, despite their divergence by 500 million years

Scientists who watched neurons connect inside the eyes of growing squid discovered a fascinating secret – the brains of cephalopods independently evolved to develop in the same way as our own.

The discovery was made using high-resolution cameras focused on the retinas of longfin squid (Doryteuthis pealeii) embryos, despite 500 million years of divergent evolution, the basic blueprint for how brains and complex nervous systems develop may be the same across a wide range of species.

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