I’m obsessed with brittle stars: fish often nip off bits of their arms but they regenerate

These starfish relatives have lots of remarkable features and are a keystone species. My hope is that we will recognise how vital these charismatic creatures are

Brittle stars have a lot of remarkable features as a species. Many of them are bioluminescent and can flash blue light; some will have patterns and do displays. These slender relatives of starfish can be very beautiful to look at and come in a range of colours - in the tropics, for example, they can be red, black or orange. And they've got spines all over them, so they can look quite ornate.

They can also regenerate. Fish and other creatures will often nip off bits of their arms - known as sublethal predation - so they are constantly regenerating themselves. You can even break off all their arms, and sometimes even half the disc, and the brittle star will still regenerate.