(See Y. Wenger et al., “Loss of neurogenesis in Hydra leads to compensatory regulation of neurogenic and neurotransmission genes in epithelial cells,” Philosophical Transactions of the Royal Society B, 2015.)
Image of the Day: Adaptable Animal
If Hydra vulgaris loses its ability to create nerve cells (green), it can activate epithelial cells to take on some neuronal duties.

