Biomphalaria sudanica

Biomphalaria sudanica is a species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails. This species is African, and occurs mainly in East Africa: A cladogram showing the phylogenic relations of species in the genus Biomphalaria: Biomphalaria sudanica is found in shallow water near the shoreline in Lake Albert. Despite being a pulmonate, Biomphalaria sudanica is well adapted to use the oxygen from water (but not as well as Planorbis). This ability is useful for living in swamp habitats. The population density of Biomphalaria sudanica varies during the year. The highest population density of Biomphalaria sudanica is in Lake Ziway, Ethiopia from June to August, at the end of rainy season. The higher densities of Biomphalaria sudanica occur in habitats with the Common Water Hyacinth Eichhornia crassipes in Lake Victoria. It was experimentally detected under laboratory conditions that shells of Biomphalaria sudanica are bigger in waters with higher concentration of calcium than in waters with low calcium.