The potential activity of three varieties of Bacillus thuringiensis (kurstaki, israeliensis, and thuringiensis) against the soft tick Argas persicus and the hard tick Hyalomma dromedarii was investigated. Soft ticks succumbed within a period ranging from 36 h to 5 days and hard ticks died at between 48 h and 10 days posttreatment, depending on the dose. Concentrations lethal to 50% of tick populations (LC50 values) indicated that Dipel 2x (B. thuringiensis var. kurstaki) was the most potent, followed by Vectobac (B. thuringiensis var. israeliensis), then HD 703 (B. thuringiensis var. thuringiensis). A. persicus was more affected than H. dromedarii by B: thuringiensis varieties. Eggs were mostly affected at 16 and 25 days after deposition for A. persicus and H. dromedarii, respectively.

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SummaryBiomphalaria alexandrina snails have received much attention due to their great medical importance as vectors for transmitting Schistosoma mansoni infection to humans. The main objective of the present work was to assess the efficacy of miltefosin a synthetic molluscicidal drug and artemether a natural molluscicidal drug. The correlation between immunological and histological observations from light and electron microscopy of the hemocytes of B. alexandrina post treatment with both drugs was also evaluated. LC50 and LC90 values were represented by 13.80 ppm and 24.40 ppm for miltefosine and 16.88 ppm and 27.97 ppm for artemether, respectively. The results showed that the treatment of S. mansoni-infected snails and normal snails with sublethal dose of miltefosine (LC25=8.20 ppm) and artemether (LC25=11.04 ppm) induced morphological abnormalities and a significant reduction in hemocytes count.

During a parasitological survey on marine fish species inhabiting Hurghada Coasts of the Red Sea, Eighty seven fish specimens of 2 different species were found naturally infected by three different species of digenean parasites, one of them was reported as new host and locality in Egypt. These were Phyllodistomum hoggettae (family: Gorgoderidae) infecting the Arabian mallas Thalassoma klunzingeri (family: Labridae). Body length to width ratio 1:3. Oral sucker opened subterminally. Intestinal bifurcation midway between oral and ventral suckers. Ventral sucker distinctly equal in size to the oral sucker. Testes slightly lobed, oblique, in mid-body; ovary entire, heart shaped, sinistrally posterior to ventral sucker and anterior to testes. Vitelline lobes entire and almost round. Gyliauchen volubilis (family: Gyliauchenidae) infecting the marbled spinefoot Siganus rivulatus (family: Siganidae). Body fleshy, robust, conical, tapered anteriorly, convex dorsally, concave ventrally, with small tail-like protubera-nce postero-dorsal to acetabulum. Prepharynx very long and convoluted, occupied greater part of the anterior body half. Pharynx elongated, prephanyx very coiled and situated close to intestinal bifurcation. Ventral sucker well developed and spherical. Oesophagus very long, wide, longer than body straightened length. Two testes oval, symmetrical, dorsal to ventral sucker, subequal in diameter. Ovary spherical, dextro-submedian between right testis and cirrus sac. Vitelline follicles relatively small, irregular, numerous, extended in lateral fields between testes and mid-oesophageal level, confluent in region of intestinal bifurcation. All of the recovered species were compared with others recorded from different hosts.