Morphology of the caeca of the African pied crow ( Corvus albus )

Aquatic snail species of two adjoining Rivers (Otamiri and Nwaorie Rivers) in Owerri Southeastern Nigeria was surveyed between December 2008 and May 2009. The study identified 231 aquatic snail species. Snail species collected were Bulinus globosus (29.9%), Lymnaea natalensis (59.3%), and Melanoides sp. (10.8%). There was an observed statistical difference (P < 0.05) in the occurrence of the snail species. Otamiri River recorded 93.3% species while Nwaorie recorded 6.1% - a significant difference (P < 0.05) also existed. Of the total number of snail species collected, none was found shedding cercariae. Therefore, surveillance is needed to avoid emergence of diseases vectored by this snail species in the study area.