Trematodes of Red Sea fishes: Hexangium brayi n. sp. (Angiodictyidae Looss, 1902) and Siphodera aegyptensis n. sp. (Cryptogonimidae Ward, 1917), with a review of their genera

Abstract

Specimens of the marine fishes Siganus luridus (Siganidae) and Caesio suevica (Lutjanidae) were caught in the Red Sea off the coast of Sharm El-Sheikh, South Sinai, Egypt. Twelve (30%) and eight (17%) fish, respectively, were found to harbour intestinal trematodes. S. luridus was parasitised by Hexangium brayi n. sp. (Angiodictyidae) and C. suevica by Siphodera aegyptensis n. sp. (Cryptogonimidae). H. brayi n. sp. is differentiated from the other two species of the genus by the vitelline follicles which are confined to the inter-caecal field, its body shape which is distinctly pyriform, the terminations of the intestinal caeca which are distinctly saccular, the eggs which are few in number, and by the excretory vesicle which gives off a lateral arm on each side that divides into two long collecting ducts. S. aegyptensis n. sp. is most similar to S. cirrhiti Yamaguti, 1970, but differs in having a definite number of testes (nine), seven arranged in a ring and the other two situated symmetrically or diagonally within this ring, and vitelline follicles extending posteriorly to the level of the anterior lobes of the ovary. Both genera Hexangium Goto & Ozaki, 1929 and Siphodera Linton, 1910 are reviewed in detail and redefined.

Trematodes from Red Sea Fishes: Neohypocreadium aegyptense n. sp. (Lepocreadiidae), Fairfaxia cribbi n. sp. and Macvicaria chrysophrys (Nagaty & Abdel-Aal, 1969) (Opecoelidae)

“…This is the second of two papers on the trematode fauna of Red Sea fishes (see Hassanine & Gibson, 2005). The present report deals with three digeneans, including two new species, from chaetodontid, lethrinid and sparid hosts.…”

Molecular Phylogenetic Taxonomy and Descriptive Analysis on Hexangium sigani Goto & Ozaki, 1929 (Digenea: Microscaphidiidae) from Three Different Siganus spp. Fishes from Red Sea, Egypt

“…Al-Jahdali revealed in his description of Hexangium saudii to absence of cirrus sac [23]. On the other hand, Hassanine and Gibson indicated in the description of Hexangium brayi that "cirrus-sac weakly developed, but large, elongate-claviform, extending anteriorly from near middle of body to genital pore containing elongate, saccular seminal vesicle and inconspicuous prostatic complex" [22]. The present worker thinks that presence of weakly developed cirrus-sac but large with absence of illustrations that differentiate between seminal vesicle and cirrus-sac is not convincing and not very logic (Figure 1) [22].…”

“…Only three digenean trematodes were reported from Siganus luridus; Gyliauchen volubilis Nagaty, 1956 from Red Sea, Egypt [41,42], Hexangium brayi Hassanine & Gibson, 2005 from Sharm El-Sheikh, South Sinai, Egypt [22] and Progyliauchen magnacetabulum Al-Jahdali, 2013 from the coast of Rabigh, Saudi Arabia [23]. No any record of Hexangium sigani reported from Siganus luridus i.e.…”

“…In 2005, Hassanine and Gibson described a new species H. brayi from Siganus luridus of Sharm El-Sheikh, South Sinai, Egypt [22]. Also, in 2013, two new species added; H. ecsomi from Siganus rivulatus of Red Sea, Saudi Arabia and H. saudii from the same fish species off Saudi coast of the Red Sea [16,23].…”

Digenetic trematodes from siganid fish Amphacanthus sigan at Macady Bay, Southern Hurghada, Red Sea, Egypt

“…Parasitic helminths of the fishes are one of the least known parts of the Red Sea fauna (Hassanine and Gibson, 2005). However, study of fish parasitology is one of the more interesting branches for many researchers all over the world especially for the marine fishes for describing the new taxa (Al-Jahdali, 2010) either for the internal or external parasites.…”