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Ascidiacea, commonly known as the ascidians or sea squirts, is a paraphyletic class in the subphylum Tunicata of sac-like marine invertebrate filter feeders. [2] Ascidians are characterized by a tough outer test or "tunic" made of the polysaccharide cellulose .
Free-living flatworms are mostly predators, and live in water or in shaded, humid terrestrial environments, such as leaf litter. Cestodes (tapeworms) and trematodes (flukes) have complex life-cycles, with mature stages that live as parasites in the digestive systems of fish or land vertebrates , and intermediate stages that infest secondary hosts.
Thysanozoon nigropapillosum is quite common along the external reef in the shallow sub-tidal zone. It can swim by undulating and rhythmically contracting the body margins. It feeds on tunicates, using its mouth and large pharynx to engulf Didemnum spp., and later regurgitates food pellets containing the calcareous spicules present in their tunic
Photos show the worm’s overall body shape and pinkish coloring. A Prosthiostomum huidongense, or Huidong marine flatworm, as seen from above (left) and below (right). Photos from Liu, Lin, Wang ...
Hammerhead worms are planarians, a type of flatworm. Five species of invasive hammerhead worms — four in the genus Bipalium and one in Diversibipalium — are established in North America, said ...
Bearded fireworm Bearded fireworm from the Mediterranean. Bearded fireworms are usually 15 cm (6 inches) in average length, but can reach up to 30 cm (12 inches). [1] [2]At first glance, this fire worm looks like a centipede with its elongated and flattened appearance, multiple segments, white silks, and parapodia and gills located on the side of its body.
Pseudoceros lindae can reach a length of 50–80 millimetres (2.0–3.1 in). The upper surface of the thick and elongated body shows a wine color (burgundy) background with turquoise margins and a variable number oval to round yellow-golden spots.
Tunicata, also known as sea squirts or sea pork, are filter feeders attached to rocks or similarly suitable surfaces on the ocean floor; Some flatworms of the classes Turbellaria and Monogenea; Xenoturbella, a genus of bilaterian animals that contains only two marine worm-like species;