ABSTRACT The male genital system of the water mite, _Unionicola aegyptiaca_ consists of an accessory gland, two spherical testes, two vasa deferentia, common vas deferens, an ejaculatory complex and spermatopositor (penis) and is supported with the male genital skeleton. It is evident that each testis is enclosed in a very thin amorphous layer (basal lamina) and consists of a germinal ... Read more

The oribatid mite _Trimalaconothrus crassipes_ n. sp. was described for the first time from the roots of the floating aquatic plant, _Eichhornia crassipes_, River Nile, Girga, Sohag, Egypt. The present species has the characteristic features that are in accordance with those of family Malaconothridae and genus_ Trimalaconothrus_. The present species has specific characters compared with characters of other species of ... Read more

ABSTRACT: _Unionicola aegyptiaca_ was described for the first time from the freshwater mussel,_ Caelatura__aegyptiaca,_ River Nile, Sohag, Egypt. The descriptive characters of the present species are in accordance with those of the superfamily, family and the genus. The present species has a specific characters compared with characters of other species of the same genus. These characters are summarized as follows: ... Read more

ABSTRACT A description is given for a new species of free living water mites belonging to the genus _Eutetranychus_. The descriptive characters of the present species are in accordance with those of family, subfamily, tribe and the genus. The specific characters of the present species, the identity of the sire and ifs distribution in Awlad- Nousier canal in Sohag, Egypt ... Read more

Abstract The fine structure of haemocytes in the freshwater mite Unionicola tetra/uTcatus is described and compared with other species of invertebrates. The present study reveals that the haemocytes consist mainly of two types; agranulocytes and granulocytes. The granulocytes is subdivided into 7-types (I-VD). The granulocytes are more abundant, larger in' size with smaller nuclei and larger amount of granulated cytoplasm. ... Read more

ABSTRACT The adult water mite _Unionicola tetrafurcatus _Ramadan & Aboul-Dahab, 2002 is symbiotic on the freshwater mussel _Caelatura aegyptiaca _Caillaud, 1827_. _Five species of protozoan ciliates belonging to two subclasses (Suctoria and Peritrichia) were found stuck firmly with the mite legs (I-IV). The suctorian species was _Tokophrya quadripartita _and the peritrichs included _ Zoothamnium _sp., _Epistylis _sp_., Rhabdostyla vernalis _and ... Read more

ABSTRACT A numerical taxonomic analysis was applied for 280 morphological characters collected from 44 species of water mites. This analysis was based on three methods; SPSS, MDS and PCA to study the morphological variations within and between the suborders, families, genera and species of these water mites. On the basis of these methods, the studied water mites were categorised to ... Read more

ABSTRACT The male reproductive system in the water mite _Unionicola tetrafurcatus_ consists of a single accessory gland, 2 testes, each leads to a vas deferens, the latter leads to an ejaculatory duct and copulatory organ. The system is supported with a genital skeleton consisting of cella and brachia. Each testis is composed of a glandular and germinal parts. In the ... Read more

ABSTRACT The present protozoan parasite _lchthyosporidium _sp. was reported to infect the gut, salivary gland and embryos of the water mite _Unionicola anodontae _(Aboul-Dahab _et al., _1998).TIle life history of this protozoan parasite includes two processes, schizogony and sporogony. It caused a serious damage to the embryos and adult forms of the mite as compression and disarrangement of the embryonic ... Read more

ABSTRACT Two new species of rheophilic water mites _Arrenurus _(_Micruracarus_)_ curvus _and _A. _(_Micruracarus_)_ bulbus _obtained from the River Nile at Sohag, upper Egypt, were described and identified. Among the specific characters, the male petiole of the first species is hyaline, striated, W-shaped and did not extend beyond the pygal lobes, while that of the second species is toothed, bulb-shaped ... Read more