[2] They are demersal and sometimes collected by fishing trawls, with ranges from 80 to 291 meters.

[3] Eurypegasus papilio generally have 8 tail rings and reaches 7.6 cm.

[4][5] Their bodies are flat and encased in bone plates, believed to be for protection against predators.

Their jaws cannot be seen when their mouths are closed due to being covered by the lachrymal and being tucked in a cavity made by the nasal rostrum.

[6] This tube mouth is then used by the Eurypegasus papilio to suck up their prey, which happens to be tiny invertebrates living in their demersal habitat.