Microcotyle danielcarrioni  Microcotyle danielcarrioni is a species of monogenean, parasitic on the gills of a marine fish. It belongs to the family Microcotylidae. "Microcotyle danielcarrioni" was first described and illustrated based on specimens from the gills of the Peruvian morwong "Cheilodactylus variegatus" (Cheilodactylidae) off Peru, without referring to holotype number. In the original description, this species was placed in the genus "Paramicrocotyle", a genus erected for "P. atriobursata" and "P. tampicensis"  and distinguished from "Microcotyle" by the following features: structure of the haptor, structure and shape of the genital atrium and the presence of two vitellovaginal pouches. Sixteen species previously belonging to the genus "Microcotyle" were placed in this newly erected genus. Later, Mamaev (1986) synonymised "Paramicrocotyle" with "Microcotyle", and "Paramicrocotyle" was considered taxon inquirendum. Mamaev (1986) did not change the generic status of "P. danielcarrioni", probably omitted. Oliva & Munoz (1985) suggested that "Microcotyle danielcarrioni" was a synonym of "Microcotyle nemadactylus", but retained it in the genus "Paramicrocotyle". Based on morphological similarities between the genus: "Microcotyle" and "Paramicrocotyle", Bouguerche "et al"., followed Mamaev (1986) and considered "Paramicrocotyle" a junior synonym of "Microcotyle"as their molecular analyses included a member of "Paramicrocotyle" which was placed amongst other species of "Microcotyle" without having a distinct branch. "Paramicrocotyle danielcarrioni" was thus transferred to the genus "Microcotyle". "Microcotyle danielcarrioni" has the general morphology of all species of "Microcotyle", with a symmetrical body, comprising an anterior part which contains most organs and a posterior part called the haptor. The haptor is symmetrical, and bears clamps, arranged as two rows, one on each side. The clamps of the haptor attach the animal to the gill of the fish.