Al-Jahdali, M.O. (2013). New intestinal trematodes from siganid fishes off the Saudi coast of the Red Sea. Acta Zoologica Academiae Scientiarum Hungaricae, 59(1), 3-12.

172752

Al-Jahdali, M. O.

2013

59(1): 3-12

Publication

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In small samples of the siganid fishes Siganus rivulatus Forsskål et Niebuhr and S. luridus Rüppel (Teleostei) from off the Saudi coast of the Red Sea, some individuals of each fish were found infected with a new intestinal trematode. Those of S. rivulatus were infected with Hexangium saudii sp. n. (Trematoda: Microscaphidiidae), whereas those of S. luridus with Progyliauchen magnacetabulum sp. n. (Trematoda: Gyliauchenidae). Hexangium saudii sp. n. differs clearly from the two valid species of the genus, H. sigani Goto et Ozaki, 1929 (type- species) and H. brayi Hassanine et Gibson, 2005 in many specific characters and is unique in having vitelline follicles arranged in rosette-like groups and short intestinal caeca distant from the testes. Progyliauchen magnacetabulum sp. n. differs clearly from P. sigani Shalaby et Hassanine, 1997, the type and the only species of the genus in many specific characters and is unique in having a much larger ventral sucker, a very long oesophagus (longer than the total body length), a much larger oesophageal bulb and a tubular seminal vesicle.

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