[4] Four years later, Yamaguti provided some measurements of Microcotyle caudata based on several specimens recovered from the gills Sebastodes inermis.

[5] Yamaguti hesitated in assigning his specimens to Microcotyle caudata as he was uncertain of the extent of variability of the number of clamps according to individuals.

He even pointed that the specimens of Microcotyle caudata recovered from Sebastodes inermis may represent a distinct species.

The reproductive organs include a genital atrium opening on the same level as the beginning of the intestinal branches, armed with conical and slightly curved spines, unarmed vagina opening behind the common genital opening, at about six times as far forwards from the anterior end of the ovary, a single ovary, with the oviduct end on the right side, thence extending towards the left, presenting a convex border in front, 23 large testes posterior to the ovary and occupy a little less than one quarter of the whole length of the body.

[2] It was also reported off Japan,[4][5] Russia,[6] Southeast Atlantic,[7] Southwest Indian Ocean, the Mediterranean,[7] and off the southwestern slope of Iceland.