Ichthyophaga subcutanea, on the other hand, has been shown to be a true parasite of such marine fish as Hexagrammus decagrammus. As such, they do not cause harm to the crayfish and only depend on the crayfish for transport and stirring up environments with food sources. In their environment, emnosewellia minor use their strong suckers to attach onto crayfish (at the tail section) from where they feed on various smaller organisms like protozoa wherever the fish goes. One of the best examples of a free-living (opportunistic) species in this order is the Temnosewellia minor. For instance, members of the order Temnocephalida exist as either entirely commensals or parasites. As such, they require at least moist conditions to survive.ĭepending on the species, members of class Turbellaria either exist as free-living organisms or parasites. While a majority of these species live in marine environments, there are many others that can be found in freshwater environments as well as tropical terrestrial and moist temperate environments. As such, they are also often referred to as protostomes.Īpart from these higher classifications, the phylum is further divided into the following classes:Ĭlass Turbellaria is composed of about 3,000 species of organisms spread across at least 10 orders. Protostomia- As members of this clade, flatworms comprise three germ layers. This classification includes animals with bilateral symmetry consisting of a head and tail (as well as a dorsal part and belly). In some classifications, they are also classified under the basal animal clade Eumetazoa since they are metazoans that fall under the animal kingdom (Kingdom Animalia).īilateria- Flatworms also fall under Bilateria in Eumetazoa. Kingdom: Animalia - Flatworms fall under the animal kingdom that is characterized by multicellular eukaryotic organisms. On the other hand, they make up the largest phylum among acoelomates. With more than 20,000 species currently identified, the phylum Platyhelminthes makes up one of the largest phyla after chordates, mollusks, and arthropods. Flatworms (Platyhelminthes) are a group of bilaterally symmetrical, acoelomate, soft-bodied invertebrate animals found in marine, freshwater as well as moist terrestrial environments.
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