found in Central and

stropoda is the largest class of mollusks, with between 60,000 and 75,000 species. It members are termed gastropods, gasteropods, or univalves. The class comprises snails and slugs as well as a vast number of marine and freshwater species. They typically have a well-defined head with two or four sensory tentacles, and a ventral foot. They are distinguished by torsion, a process where the body coils to one side during development. Gastrotheca (Marsupial frogs) is a genus of frogs in the family Hylidae, found in Central and South America. Gastrotricha is a phylum of microscopic animals, found in freshwater and marine environments. Its members are termed 'gastrotrichs. They are bilaterally symmetric, with a complete gut. The body is covered with cilia, especially about the mouth, and has two terminal projections that serve as adhesive tubes. Like many microscopic animals, locomotion is primarily powered by hydrostatics, and they reproduce entirely by parthenogenesis. Originally gastrotrichs were thought to have a pseudocoel, but this was an artifact created by preservation methods, and they are now known to be acoelomate. Genetic testings demonstates close relation to flatworms. About 450 species are known, with an average life span of about three days. Gastrovascular cavity Gastrorchis Gastropholis