Lophotrochozoa-> marine phylumsome inhabit freshwater, and some snails and slugs are terrestrialCaCO3 exterior protective coating
mollusca
Lophotrochozoa is a major clade of invertebrate animals. It includes a diverse group of marine animals, some of which also inhabit freshwater, while some snails and slugs are terrestrial. Members of this group share certain characteristics in their embryonic development and body structure, and are known for having a lophophore or a trochophore larva, or in some cases, both.
The marine phyla that belong to Lophotrochozoa include Phoronida, Brachiopoda, Nemertea, Annelida, Mollusca, and Platyhelminthes. These phyla are characterized by possessing a shell or a protective covering known as an exoskeleton or cuticle. The shells of many mollusks, such as clams and oysters, are composed of calcium carbonate (CaCO3), which provides protection against predators and other environmental pressures.
While the majority of lophotrochozoans live in aquatic environments, some have adapted to life on land, such as snails, slugs, and certain worms. Terrestrial forms of lophotrochozoans have evolved specialized structures to help them survive in their new environments. For example, snails and slugs have a mantle cavity that functions as a lung to extract oxygen from the air, while many worms have developed a resistant cuticle to prevent water loss and protect themselves from predators.
In summary, Lophotrochozoa is a diverse group of invertebrate animals that includes several marine phyla, some of which also inhabit freshwater, and some snails, slugs, and worms that have adapted to live on land. The CaCO3 exterior protective coating found in many mollusks provides valuable protection against environmental pressures.
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