الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
This study deals with the morphological, anatomical and biological studies of Cleopatra bulimoides and a Bithynia sp belonging both to class Gastropoda and subclass Prosobranchia but to two different families, namely Thiaridae and Bithyniidae.
Cleopatra and Bithynia snails were collected from Giza and Fayoum governorates and were kept in the laboratory to record their mortality percentage. Snails lived in the laboratory for a maximum period of 9 months.
Morphological studies dealt with the description of the shell, concerning the number of whorls in each snail species, their measurements, the correlation coefficient between the shape of the shell and its thickness, weight, length and width.
In the anatomical study, the description and drawings of the digestive and reproductive systems in both snails were made. Sexes are separate and no external dimorphism in Cleopatra snails is observed, but in Bithynia snails it is evident due to the presence of the penis in the male.
Snails could survive in water of temperature of 25- 35°C and pH ranging from 7to9.
Electrophoretic studies carried out on the foot of both species showed that the general protein pattern is almost the in both snail species but with differences in its amount in each one. Also, there are some bands present in Cleopatra and absent in Bithynia sp and vice versa.
Finally, the karyotype of the two snail species showed that Cleopatra has 2n = 28 chromosomes, and Bithynia has 32 chromosomes (2n). chromosomes were arranged in a genetic map according to their length and the position of centromeres.
Key words: Cleopatra, Bithynia, Thiaridae, Bithyniidae.