Pseudodistomidae
The Pseudodistomidae are a family of parasitic flatworms in the order Plagiorchiida. They are commonly known as “pseudodistomes”. Pseudodistomes are a diverse group, with over 100 species described. These trematodes are primarily parasitic in marine invertebrates, particularly mollusks, and are known to infect a range of hosts including bivalves, gastropods, and cephalopods. They have a complex life cycle, often requiring multiple intermediate hosts before reaching their final host.
Characteristics
Pseudodistomes are characterized by their distinctive morphology, including a flattened, elongated body with a distinct anterior end (head). They possess a muscular pharynx and a branched digestive system, and in most species, a prominent genital pore located ventrally. They have a unique feature, a protrusible, tubular organ called a cirrus, which functions in copulation.
Environments
Pseudodistomidae are primarily found in marine environments, where they are common in coastal waters and intertidal zones. Their distribution is largely tied to the availability of suitable intermediate hosts, like marine snails and bivalves.
References
For further information on the Pseudodistomidae family, you can consult the following sources: