Daughter Sporocyst: These are an asexual production of cercariae they absorb nutrients while having no mouth.Īfter the sporocyst the larva forms.Mother Sporocyst: These have loose plates (cilia) and migrate to gonads.Sporocysts are elongated sacs that produce either more sporocysts or rediae. The first intermediate host can differ for different trematodes. Energy is needed to develop into a sporocyst. They do not have a mouth therefore they cannot eat and need to find a host quickly if they hatch in the environment. Miracidia hatch from eggs either in the environment or in the intermediate host. Adult metacercariae or mesocercariae, depending on the individual trematode's life cycle, will then infect the vertebrate host or be rejected and excreted through the rejected host's faeces or urine. The cercariae then could either infect a vertebrate host or a second intermediate host. Miracidia will then grow and develop within the intermediate host into a sac-like structure known as a sporocyst or into rediae, either of which may give rise to free-swimming, motile cercariae larvae. The hatchling is called a miracidium, a free-swimming, ciliated larva. Some trematode eggs hatch directly in the environment (water), while others are eaten and hatched within a host, typically a mollusc. The life cycle of a typical trematode begins with an egg. Trematodes are covered by a tegument, that protects the organism from the environment by providing secretory and absorptive functions. Trematodes are parasitic flatworms of the class Trematoda, specifically parasitic flukes with two suckers: one ventral and the other oral. Life-history stages of the trematode flatworm Fasciola hepatica from 1911 Encyclopædia Britannica

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