This bright green sea creature contains a toxic pigment that protects it from predators, kills bacteria and determines the ...

The creature looks like it's a proboscis or ribbon worm, Kyle Hill of Nerdist explains - a Google translation of the video description from Thai to English seems to indicate the same.

The species stands out from others by the black tip on the proboscis, a part of the worm that is twice as long as the collar, researchers said. “Glossobalanus weii sp. Nov. usually inhabits ...

When these worms 'mouth fight', a short proboscis extends followed by extremely rapid expansion of the posterior pharynx. This rapid strike produces a loud 'pop' comparable to those made by ...