Pleuronectitrema kuwaitense Kritsky & Sey n. sp. from the large toothed flounder, Pseudorhombus arsius, Paralichthyidae. 181, Whole mount (ventral view, composite); 182, Male copulatory organ (ventral view); 183, Hook; 184, Ventral anchor; 185, Dorsal bar; 186, Ventral bar; 187, Dorsal anchor. Measurements of the length of the MCO (Fig. 182) are the actual lengths obtained using a calibrated curvimeter on drawings made using a camera lucida; parallel lines on Fig. 182 indicate the measured limits of the ring diameter.