Egyptian Society of Biological SciencesEgyptian Academic Journal of Biological Sciences, B. Zoology2090-07593120111201Updated description of Neolepidapedon (Neolepidapedon) macrum Overstreet, 1969 and Opisthomonorcheides decapteri Parukhin, 1966, infecting emperor fishes, Lethrinus nebulosus, in fish market of Abha city, Saudi Arabia191430810.21608/eajbsz.2011.14308ENAbdel-Nasser A.HusseinZoology Department, Faculty of Science-Qena, South Valley University, EgyptDihom A.Al-BasselZoology Department, Faculty of Science, Fayoum University, EgyptHodaSaadyZoology Department, Faculty of Science-Qena, South Valley University, Egypt.Mohammed A.Al-ShehriBiology Department, Faculty of Science, King Khalid University, Saudi ArabiaJournal Article20180920Emperor fishes, <em>Lethrinus nebulosus</em> are commercially important fishes in Saudi market. Despite of importance of these fishes, there is not a comprehensive report about parasitic fauna of these fishes. The aim of this research article is to determine the parasitic helminthes infecting these fishes in Saudi Arabia. For this purpose, 28 emperor fishes have been bought and examined by routine parasitological methods to find that 28.6% emperor fishes revealed intestinal trematode infections. Two trematodes were recognized in the fishes, <em>Neolepidapedon (Neolepidapedon) macrum</em> Overstreet, 1969 was found in 7 fishes (25%) and <em>Opisthomonorcheides decapteri </em>Parukhin, 1966was found infecting one fish only. Scanning electron microscope had shown absence of spines and revealed scale-like structure. Saudi Arabia is considered a new locality of those two trematodes and Emperor fishes as new hosts.https://eajbsz.journals.ekb.eg/article_14308_36d93e3d917f7f779e40f24b494472bc.pdfEgyptian Society of Biological SciencesEgyptian Academic Journal of Biological Sciences, B. Zoology2090-07593120111201Population dynamics of freshwater snails (Mollusca: Gastropoda) at Qena Governorate, Upper Egypt11221430910.21608/eajbsz.2011.14309ENMohamed A.HusseinDepartment of Zoology, Faculty of Science, Assiut University, EgyptAhmad H.Obuid-AllahDepartment of Zoology, Faculty of Science, Assiut University, EgyptAmal A.MahmoudDepartment of Zoology, Faculty of Science, South Valley University, EgyptHeba M.FangaryDepartment of Zoology, Faculty of Science, South Valley University, EgyptJournal Article20180920Monthly and seasonal fluctuations in densities of freshwater snails were recorded in six different sites at Qena Governorate during the period of March 2009 February 2010. The study revealed the occurrence of 13 species of freshwater snails belonging to 9 families of class Gastropoda. The snail species and their total catch were: <em>Cleopatra bulimoides</em> (1704 specimens), <em>Lanistes carinatus</em> (1468 specimens), <em>Melanoides tuberculata</em> (1036 specimens), <em>Gabbiella senaariensis</em> (731 specimens) <em>Theodoxus niloticus</em> (670 specimens), <em>Bellamya unicolor</em> (588 specimens), <em>Physa acuta</em> (213 specimens), <em>Lymnaea natalensis</em> (145 specimens), <em>Succinea cleopatra</em> (85 specimens), <em>Bulinus truncatus</em> (73 specimens), <em>Biomphalaria alexandrina</em> (41 specimens), <em>Gyraulus ehrenbergi</em> (12 specimens) and <em>Helisoma duryi</em> (2 specimens) in a descending order. The densities of the recorded snails varied seasonally and the general seasonal peak was recorded during Autumn while the lowest density observed during Winter. Ecological factors which may influence the distribution of the recorded snails were also determined (water temperature, pH, dissolved oxygen conductivity, total hardness, total dissolved salts, water depth and percentage of macrophytes).https://eajbsz.journals.ekb.eg/article_14309_1ae854af143681c6fb4f7264d043dcca.pdfEgyptian Society of Biological SciencesEgyptian Academic Journal of Biological Sciences, B. Zoology2090-07593120111201Associations between reproductive cycle and occurrence of intestinal helminths infecting the Egyptian lizard, Chalcides ocellatus19261431010.21608/eajbsz.2011.14310ENHala M.EbaidZoology Department, Faculty of Science, Suez Canal University, Ismailia, EgyptJournal Article20180920Little attention has been given to the association between the host reproductive cycle and the dynamics of parasitic infection in the reptilian model. This relationship was investigated in this study with the common intestinal nematode, <em>Thelandros schusteri</em> (Family: pharyngodonidae) infecting the Egyptian lizards, <em>Chalcides</em><em> ocelattus</em>. Fifty threelizards were collected during winter and spring 2009 and were weighted and sexed. The gonads were weighted and gonadosomatic index (GSI) was calculated; both represent measures of the reproductive cycle. The intestinal nematodes were recovered from the intestine by the standard technique. Results showed that the seasonal variation did not affect the infection prevalence in male or female lizards while GSI greatly affected the prevalence in female lizards only. Females with low GSI showed the highest infection prevalence while, those of high GSI showed the highest intensity of infection. Positive or negative correlations between number of follicles<strong>/</strong> ovary, gonad mass or GSI and the intensity of infection in female hosts suggested that the investment in reproduction of females is more costly than for males. We interpret the high intensity of infection in females to be an effect of the reproductive cycle and conclude that sex dependent difference is very important in such pattern of host parasite relationship when aspects of reproductive cycle are considered and that the host reproductive investment may be a factor contributing to occurrence of parasitic infection.https://eajbsz.journals.ekb.eg/article_14310_38675aaa83fe31ccdd86454a55b5e042.pdfEgyptian Society of Biological SciencesEgyptian Academic Journal of Biological Sciences, B. Zoology2090-07593120111201Certain effects of different spectral colors on some biological parameters of the two-spotted spider mite, Tetranychus urticae27391431110.21608/eajbsz.2011.14311ENManal S. M.IsmailPlant Protection Research Institute, Agriculture Research Center, Dokki, Cairo, Egypt.Ahmed H.AboGhaliaZoology Department, Faculty of Science, Suez Canal University, Ismailia, EgyptMaha F. M.SolimanZoology Department, Faculty of Science, Suez Canal University, Ismailia, EgyptMona M.A.GhallabPlant Protection Research Institute, Agriculture Research Center, Dokki, Cairo, EgyptJournal Article20180920Certain effects of different spectral light colors were studied on some biological attributes of the two-spotted spider mite, <em>Tetranychus urticae</em>. Rearing of animals was carried out under conditions of 27±0.5<sup>°</sup>C; 60% R.H. and 16 L/8 D photoperiod on Sweet Potato leaves. Thus, 5 artificial light colors were applied under controlled laboratory conditions on these animals: blue, red, green, yellow and white Neon. After treatment, the highest number of deposited eggs/female was observed by using the blue color (14.9±0.5 eggs/female) while the lowest one was the yellow (3.1±0.2 eggs/female) compared to 9.9±0.4 eggs/female for the control group. On the other hand, diapause incidence was observed for the target females under conditions of 18±2<sup>°</sup>C; 60±2% R.H. and the light and dark periods were set at 8 L/16 D, respectively. Results showed that white Neon color caused the highest percentage of diapausing females (88.66±1.8%) followed by green color (78±3.5%), yellow (68.66±2%), the blue color with (54±2%), and finally none of them entered diapause under red color. Results were analyzed and discussed for the aforementioned important economic pest animals.https://eajbsz.journals.ekb.eg/article_14311_ab00f17b6fa1a0c5b89f7b54c595eb7d.pdfEgyptian Society of Biological SciencesEgyptian Academic Journal of Biological Sciences, B. Zoology2090-07593120111201Acaricidal activities of some essential and fixed oils on the two-spotted spider mite, Tetranychus urticae41481431410.21608/eajbsz.2011.14314ENManal S. M.IsmailPlant Protection Research Institute, Agriculture Research Center, Dokki, Cairo, Egypt.Mona M. A.GhallabPlant Protection Research Institute, Agriculture Research Center, Dokki, Cairo, EgyptMaha F. M.SolimanZoology Department, Faculty of Science, Suez Canal University, Ismailia, EgyptAhmed H.AboGhaliaZoology Department, Faculty of Science, Suez Canal University, Ismailia, EgyptJournal Article20180920A comparison was made for studying the effect of some Essential oils: Rosemary, Garlic, Jojoba and Fixed/Vegetable oils on the important mite pest, <em>Tetranychus urticae</em>. The sublethal concentrations of Rosemary oil (0.125%), Garlic oil (0.5%), Jojoba oil (0.25%) and Vegetable oil (0.125%) were used. Biological tests were carried out for a susceptible laboratory two-spotted spider mites strain reared under controlled conditions of 27±2<sup>°</sup>C; 60% R.H. and 16L/8D photoperiod on Sweet Potato leaves. Results showed that Garlic oil caused the highest significant decrease in the number of deposited eggs as compared to the other tested oils. All the oils used have no effects on females mite fertility. Vegetable oil greatly affected the percentage of nymphs that reached adult stages followed by Jojoba oil then Garlic oil while Rosemary had no effects on nymph's developments. Results were tabulated, analyzed, discussed and prepared to be fit in any IPM program for combating these pest animals.https://eajbsz.journals.ekb.eg/article_14314_4abd0f8d45e89eaa7eb4dcbaec1d53e6.pdf