Neoechinorhynchus dimorphospinus Amin and Sey, 1996, was described from 4 species of marine fishes in the Arabian Gulf off Kuwait. Specimens of N. dimorphospinus have been reported only twice since then from marine and freshwater fishes also from the Arabian Gulf and brackish waters associated with it. The 2 latter reports offered no new descriptive accounts. SEM studies based on recent collections of N. dimorphospinus from Klunzinger's mullets, Liza klunzingeri (Day, 1888) (Mugiliformes) (new host record), revealed many new features that were not possible to include in the original description using optical microscopy. These new features include an apical organ in the proboscis, a broad prominent collar at the anterior end of the trunk, prominent longitudinal grooves on proboscis hooks, a pair of sensory structures in the neck, the subterminal position of the female gonopore with a minute lipless vulva, micropores on the trunk not showing differentiation in various trunk regions, and eggs in different stages of development. There is extensive damage to the host intestine due to invading specimens of N. dimorphospinus. Worms destroy the epithelial lining of L. klunzingeri and migrate through the thin smooth muscle wall of the intestine into the host body cavity. Extensive host hemorrhaging, tissue necrosis, villi compression, and loss of host epithelial cells appears to be the typical pathology in intestinal sites occupied by this worm.
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Vol. 82 • No. 1