[Ligophorus parvicirrus n. sp. (Monogenea, Ancyrocephalidae), parasite of Liza ramada (Risso, 1826) (Teleostei, Mugilidae)].

Ligophorus parvicirrus, a new gill parasite of Liza ramada is described with its taxonomic position. The diagnosis of the genus Ligophorus Euzet and Suriano, 1977 is reviewed. The branchial distribution of Ligophorus parvicirrus is given and its microhabitat defined. The effects of a competition between this species and Ligophorus imitans Euzet and Suriano, 1977, another gill parasite of L. ramada are shown.