Detection of (Nematoda: Cystidicolidae) parasitic in and (Perciformes: Mullidae) from the Red Sea in Egypt.

The nematode parasite was collected from the intestine of and from the Red Sea in Egypt and was described using both light and scanning electron microscopy. It is mainly characterized by the presence of four submedian labia surrounded the oral aperture in the outer side, two sublabia and two pseudolabia in the inner side, rounded cephalic end, and short vestibule in both sexes. The females vulva is located near the posterior end of the body, their oval uterine eggs have a smooth surface devoid of filaments. Males have bifurcated deirids, a large left spicule (85-425 µm) with a tapered tip, and a short right spicule (50-181 µm) with a broad and rounded tip.