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The Platyhelminthes have very few synapomorphies - distinguishing features that all Platyhelminthes (but no other animals) exhibit. This makes it difficult to work out their relationships with other groups of animals, as well as the relationships between different groups that are described as members of the Platyhelminthes.
An example of a marine worm, the Parborlasia corrugatus lives at depths of up to 4,000 metres.. Any worm that lives in a marine environment is considered a water worm. Marine worms are found in several different phyla, including the Platyhelminthes, Nematoda, Annelida (segmented worms), Chaetognatha, Hemichordata, and Phoronida.
Carpet flatworms may grow to 8 cm in total length. They have pale bodies with pinkish frilled margins. The upper surface of the animal is covered with short finger-like papillae (protrusions) in pinks, caramels and browns. There is a smale pale protruding fold at the head. [2]
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Platyhelminthes (from the Greek πλατύ, platy, meaning "flat" and ἕλμινς (root: ἑλμινθ-), helminth-, meaning "worm") is a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates commonly called flatworms or flat worms.
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Curlew and Koala, two endangered North Atlantic right whales, wandered off course in January popping up along the Gulf coast near the Alabama and Florida border on Feb. 2.
Some flatworms of the classes Turbellaria and Monogenea; Xenoturbella, a genus of bilaterian animals that contains only two marine worm-like species; Xiphosura, includes a large number of extinct lineages and only four recent species in the family Limulidae, which include the horseshoe crabs.