The scissor-beak gilltail is a hybrid of the deep-sea scissorworm and gilltail. Some gilltails went deeper into the twilight zone while some some deep-sea scissorworms when up into twilight zone and met. Since they shared a common ancestors they were able to mate and became a new more successful species known as the scissor-beak gilltail. It replaced the deep-sea scissorworm in the lower ocean while the gilltail lived on in higher parts of the ocean.
It has the new respiration method was superior to the deep-sea scissorworm which allowed it not only to escape predators but catch prey faster. Despite their size they hunt as packs and will take down larger prey with their beaks. They specialize in the tregons and their relatives. Their beaks can break apart their hard exoskeletons.
Like their ancestor they have bioluminescent spots along their tails. They use these to communicate with each other when hunting. They also use it for mating displays. They will lay their eggs at the bottom of the sea. The offspring work their way up as they get older. Thus younger packs are near the bottom while older packs are in the twilight zone.