Robuta

https://www.sciencedaily.com/releases/2017/02/170201141936.htm
Some deep-sea fishes have a head joint that may enable them to open their mouths wide for consuming large prey, according to a new study.
deep sea fishesfound inheadjointmay
https://www.spacedaily.com/reports/How_fishes_of_the_deep_sea_have_evolved_into_different_shapes_999.html
Columbus OH (SPX) Nov 14, 2025 - Fish species living in the deep sea feature a surprisingly large range of body shapes that evolved in different ways and at...
the deepfishesseaevolveddifferent