Angler Fish        

 

Female Angler Fish have a small dorsal spine that protrudes above their mouths. It is tipped with a lure of luminous flesh that lures in prey. The male does not need this adaptation because it becomes a permanent parasitic mate of the female. When a male Angler Fish encounters a female, he latches onto her body with his teeth and fuses with her over time, connection to her skin and bloodstream. In exchange, the female is provided with a very reliable sperm source, avoiding the problem of having to search for a new mate upon every new breeding cycle.

 

Osedax Worms

 

These worms, known as “bone-devouring” worms, are able to live in the deep sea because they live off other organisms, such as whale carcasses. They have no mouths, no guts, no appendages, but they attach themselves to the bone and grow roots that extract organic compounds, such as fats and collagen.