Trematodes from Red Sea fishes: Pachycreadium lethrini sp. nov. (Opecoelidae Ozaki, 1925) and Pseudometadena aegyptensis sp. nov. (Cryptogonimidae Ward, 1917), with a review of their genera. Acta Parasitologica, 51(3), September 2006: 176-181. 179 [Zoological Record Volume 143]