The Tube-Eye (Stylephorus chordatus) showing off its ability to protrude both its maxilla and premaxilla during feeding, a trait which (apparently) independently evolved in oarfish and relatives.
Miya, M. et al. (2007) Mitochondrial genome and a nuclear gene indicate a novel phylogenetic position of deep-sea tube-eye fish (Stylephoridae). Ichthyol. Res. 54 323–332.