Redescription of the Redia and Cercaria of Haplorchis pumilio Using Light and Scanning Electron Microscopy (25 Jul 2007) Abstract: This study aims to know the ultrastructure of the tegument of redia and cercaria, which represent the intramolluscan stages of Haplorchis pumilio parasite, in an attempt to know how the cercaria penetrates the second intermediate host (fish); and also to know more details on the redia tegument. So 1866 snail of Melania tuberculata, which represent the main first intermediate host for H. pumilio parasite in Egypt, were collected from drains and canals of old planted lands and canals of newly reclaimed lands from Beheira governorate, Egypt. The snails were then examined for redia and cercaria of the parasite. The results showed that the percentage of infection in snails of old planted lands was 4.75% in drains and 1.3% in canals, whereas the percentage of infection in canals of newly reclaimed lands was 5.5%. In the light of detailed morphology of redia and cercaria as observed by light microscope (LM) and scanning electron microscope (SEM) structural adaptations were recognized on the surface of cercaria that help in infecting fish. These adaptations are represented by ventrally concaved body, spines located on the dorsal anterior portion of the cercarial body and the large preoral spines. These structures, in coordination with the penetration glands, help in attaching and penetrating the second intermediate host. SEM micrographs exhibited details on the cercarial body that LM did not, such as sensory papillae and openings of cystogenous glands. No more details were observed on the redia tegument when examined by SEM as compared to those recorded by LM.
The First Record for the Larval Stages of Haplorchis pumilio From Lymnaea cailliaudi Snail in Egypt (15 Jul 2007) In this study 325 Lymnaea cailliaudi snail were collected from drains (106) and canals (219) of old planted land from Beheira governorate, Egypt in the period from December 1997 to November 1999 and examined for the larval stages of trematodes. It was found that 18 snail from the drains (16.98%) were found to be infected with xiphidiocercaria sp, whereas 15 snail from the canals (6.85%) were found to be infected with larval stages of Haplorchis pumilio. The morphology of redia and cercaria of H. pumilio parasite was described fully in the text. Also the present finding was discussed on the light of findings of the previous authors.
The First Record of The Monostome Triocellate Cercaria (Ephemera Type) from Bithynia goryi Snail in Egypt (01 Aug 2007) Abstract: In this study 133 Bithynia goryi snail were collected from drains (54) and canals (79) of old planted land from Beheira governorate, Egypt in the period from December 1997 to November 1999, and examined for the larval stages of trematodes. It was found that, three snails from drains (5.55%) were infected with monostome triocellate cercaria (Ephemeratype) for the first time in Egypt. The morphology of the redia and cercaria was described fully in the text. Also the present finding was discussed in the light of the findings of the previous authors. Recommendation are stated.
