[2] The body is 4.5-6.1 millimetres in length, elongate, and it includes, like all monogeneans, a posterior attachment organ called haptor.

The haptor is symmetrical, armed with six suckers, each provided with one hook-shaped sclerite, and there is a lateral appendix bearing a single pair of terminal suckers and a single pair of hooks (also called hamuli).

The oötype wall has longitudinal rows of large cells (a structure called "ootype côtelé" by Euzet & Maillard, 1974).

It is ectoparasite on the gills of a deep-sea fish, the bigeyed sixgill shark Hexanchus nakamurai.

The name of the species, euzetmaillardi, means that it was named in honour of both Professor Louis Euzet, a famous French parasitologist, and Claude Maillard, a collaborator of Professor Louis Euzet, both authors of a major work about hexabothriids.