Photostylus is a monospecific genus of deepwater maine ray-finned fish belonging to the family Alepocephalidae, the slickheads.

The only species in the genus is Photostylus pycnopterus, the starry smooth-head, a species found in all oceans at depths of from 1,000 metres (3,300 ft) to 2,000 metres (6,600 ft).

This species grows to a length of 11 centimetres (4.3 in) SL.

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