Thrausmatos dieteri new genus, new species, is described from hydrothermal vents from the North Fiji Back Arc Basin and from a cold seep, Lihir Island Fore Arc Basin, New Ireland, Papua New Guinea.
Thrausmatos n. gen. is characterised by a small quadrate prostomium, anteriorly inserted median antenna, palps that are distally retractile, a single, paleate, ornate, notosetal fan with median fascicle absent and long, slender dorsal cirri. Neuropodia on all specimens possess long, falcigerous neurosetae with minute bifid tips and also a small distinct fascicle of highly serrate spinigers, that are probably epitokous in function, and prominent ventral glandular pads.