No abstract

The aim of this study was to determine the taxonomic position of some species of water mites, and explore the difference between the numerical taxonomy and the traditional morphological taxonomy for water mites. Based on hierarchical clustering analysis and principal component analysis (PCA), the numerical taxonomy of 17 species of water mites was carried out. These analyses were applied for 309 morphological characters of the present species. The results of the clustering analysis based on squared Euclidean distance showed that the 17 species of the water mites were divided into 10 Families in the cladogram namely Hydrozetidae, Malaconothridae, Unionicolidae, Tenuipalpidae, Tuckerellidae, Tetranychidae, Cheyletidae, Laelaptidae, Ascidae, and Dermanyssidae. The separation of these species depended on the highly-significant characters, which have high factor loading more than 1.0. The percentages of non-significant variations in the morphological characters were 51.90%, 18.45%, and 10.02% for two groups of water mite taxa with total variation equals 80.37%. In conclusion, the numerical analysis can confirm the traditional morphological taxonomy by using different analyses such as the cladistic analysis and PCA.

No abstract

No abstract

Background: The aquatic Acari are known as water mites and occupy a wide range of habitats. The freshwater mites, Unionicola aegyptiaca, were collected from the freshwater mussel, Caelatura aegyptiaca, River Nile, Sohag, Egypt. The present paper focuses on the structure of the cuticle and musculature of freshwater mite, U. aegyptiaca. Results: Histologically, the cuticle consists of two main layers: epicuticle and procuticle. The latter divided into two sublayers, exocuticle (exo) and endocuticle (en). The musculature of the present species, U. aegyptiaca, is divided into three regions: gnathosoma, idiosoma, and legs. The muscles of the body are classified according to their position and function. Conclusion: Details of muscles of gnathosoma, coxal epimerae, genital field, and legs were all described and discussed. The cuticle and musculature of U. aegyptiaca were studied by using the light microscope, and the drawings were down with the help of a camera Lucida. It is likely to note that the cuticle and musculature of freshwater mite, U. aegyptiaca, were described and discussed for the first time in Egypt.