I was writing a report on deep-sea fish and couldn't resist making my own...
I call it Carceri chauliodus, the Prison Viperfish.
It would typically be found 900 meters deep with sensitive tubular eyes staring upwards, searching for prey silhouetted against the faint sunlight above. Its huge lower jaw extends far outward as it opens its mouth, pulling prey in with its long, sharp teeth. The teeth are so big that the fish cannot fully close its mouth, but are spaced close enough together that prey cannot escape when the jaws are brought together; hence the name. Bioluminescent photophores along the side of the body produce blue light that can be used to attract prey and signal to mates. At half a meter long, it is one of the largest predators so deep in the ocean.
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Crits and comments welcome as always!