Accumulation of heavy metals in tissues of the crayfish Procambarus clarkii and in water were evaluated in areas located in the Egyptian Delta (Gharbiya, Kafr El-Shaikh, and Menofiya) in 2010 and 2021. Statistics showed that in 2010 the highest concentration of heavy metals in the digestive gland and in muscles was Zn, both in Gharbiya and Menofiya, while Fe was the highest accumulated in the digestive gland, and Pb was the highest in muscles of samples from Kafr El-Shaikh. The results showed that heavy metal loads decreased in Kafr El-Shaikh in 2021, whereas Fe increased significantly () in Gharbiya and Menofiya (41.44 ± 2.32, 47.25 ± 2.64 μg/g). Accumulation of Cd and Zn in gills and muscles decreased in all areas from 2010 to 2021, while a significant increase () was shown in Fe and Cu in 2021. All heavy metals significantly decreased () in waters of the studied areas from 2010 to 2021.

______________________________________________________________________________________ used to make delicious soups (Althunibat et al., 2009). They are essential, particularly in several parts of Asia, such as food and traditional drug systems (Taiyeb-Ali et al., 2003; Bordbar et al., 2011). Additionally, they have an exciting outline of distinctive bioactive fractions and a medical potential to display the origin of valuable antioxidant

Land snails, Theba pisana, Biomajic, Agrinate, eye histopathology and cerebral ganglia ultrastructure The land snail Theba pisana, is one of the most injurious snails, as it feeds on field crops. The traditional control methods rely on the pesticides. The most commonly used molluscicide in Egypt are Agrinate 24% (Methomyl) and Biomagic (Metarhizium anisopliae). The present study aimed to fined and evaluate the effect of pesticide on T. pisana land snail in order to predict the hazard effects of these pesticides on the non-target organisms. The exposure of adult T. pisana to sub lethal dose of Biomajic (Metarizhium anisoplae) and Agrinate caused varying degrees of ulturastrcture and histopathological changes in the examined organs (eyes, tentacles and cerebral ganglia). The exposure to both pesticides for 14 days leads to loss of the architecture of eye and eye stalk in addition, both of them displayed multiple degenerative changes in cereberal gangalia of the snail, but, molluscicide Agrinate 24% methomyl was more effective mollscicide against T. pisana than Biomajic.

Centipedes are widely distributed over all continents. They have significant medicinal value and high toxicity, making them an intriguing subject for evolutionary research. The current study aims to provide the first comprehensive analysis of the morphology, description, and distribution preferences of the Egyptian Scolopendromorpha centipede fauna. According to surveillance research in Egypt, two Scolopendra species have been re-described. Scolopendra canidensNewport.1844 were discovered in only one location, whereas Scolopendra morsitans s Linnaeus,1758 was more abundant. Both venomous glands were histochemically investigated. This study is the first comparative report on the histology and histochemistry of the venom glands of the Egyptian centipede species. Both species’ glands are primarily composed of columnar secretory cells radially arranged side by side and open through pores in a central chitinous duct. Each secretory cell is enclosed in striated muscle fibers. The secretion of both glands takes the shape of small PAS-positive granules, suggesting the presence of neutral polysaccharides. According to this surveillance study, the most abundant species was Scolopendra morsitans s Linnaeus,1758. Scolopendra canidens canidensNewport.1844 were found only on the Northwest coast of Egypt. The findings also revealed that the analyzed species are comparable in terms of their venom morphology and fundamental chemical composition.

Background: Centipedes are widely distributed over all continents. They have important medicinal value and high toxicity, making it to be an interesting subject for evolutionary studies. Due to the lack of recent taxonomic revision in Egypt, this work and for the first study that is giving a fine report on the geographical distribution and morphometric description of Egyptian Scolopendra species.Result: Two Egyptian Scolopendra species were re-described based on fresh material based on a surveillance study in Egypt. Scolopendra canidens Newport.1844 were found in only one location. Scolopendra moristans Linnaeus,1758 was more abundant. Both venomous glands were histochemically investigated. This study is the first comparative report on the histology, and histochemistry of the venom glands of the Egyptian centipede species the glands in both species are mostly made up of columnar secretory cells that are radially arranged side by side and open through pores in a central chitinous duct. Striated muscular fibers envelop each secretory cell. Except for the size of the glands, which is related to the body dimensions of each species, the secretion takes the shape of small PAS-positive granules, suggesting the presence of neutral polysaccharides.Conclusion: According to this surveillance study the most abundant species was Scolopendra moristans Linnaeus,1758. Scolopendra canidens Newport.1844 were found only on the Northwest coast of Egypt. The findings show also that the analyzed species have a lot in common in terms of morphology and fundamental chemical makeup of their venom.