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Are Flatworms Segmented or Unsegmented?
Are Flatworms Segmented or Unsegmented?
Robert Thorne••6 min read
Three types of worms with different body types will be explored in this lesson: Flatworms, which have ribbon-like bodies with no body cavity. Roundworms
Roundworms
Nematodes are very small, slender worms: typically about 5 to 100 µm thick, and 0.1 to 2.5 mm long. The smallest nematodes are microscopic, while free-living species can reach as much as 5 cm (2 in), and some parasitic species are larger still, reaching over 1 m (3 ft) in length.
, which have a body cavity but no segments. Segmented worms
Segmented worms
The annelids /ˈænəlɪdz/ (Annelida /əˈnɛlɪdə/, from Latin anellus, "little ring"), also known as the ringed worms or segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches. ... The basic annelid form consists of multiple segments.
, which have both a body cavity and segmented bodies.
Are Platyhelminthes segmented or unsegmented?
Phylum Annelida, the segmented worms. This phylum includes earthworms, leeches, and polychaetes. Last week, we covered the unsegmented worms, Phylum Platyhelminthes and Phylum Nematoda. This week, we tackle the segmented worms in Phylum Annelida.
How are flatworms different from segmented worms?
Flatworms belong to phylum Platyhelminthes. They do not have a coelom, respiratory system or a circulatory system. ... Segmented worms have a true coelom, a circulatory system and a digestive system.An earthworm is a segmented worm.
