Table of Contents
Are flatworms earthworms?
As nouns the difference between earthworm and flatworm is that earthworm is a worm that lives in the ground while flatworm is any of very many parasitic or free-living worms, of the phylum platyhelminthes , having a flattened body with no skeleton or body cavity.
Are earthworms Annelida?
The annelids include earthworms, polychaete worms, and leeches. All members of the group are to some extent segmented, in other words, made up of segments that are formed by subdivisions that partially transect the body cavity. Segmentation is also called metamerism.
What type of worms are annelids?
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.
Are earthworms roundworms?
Invertebrate animals commonly called “worms” include annelids (earthworms and marine polychaete or bristle worms), nematodes (roundworms), platyhelminthes (flatworms), marine nemertean worms (“bootlace worms”), marine Chaetognatha (arrow worms), priapulid worms, and insect larvae such as grubs and maggots.
What characteristics distinguish an annelid from other worms?
What characteristics distinguish an annelid from other worms? Annelids have segmented bodies and a coelem which is a tube filled with fluid and contains most of the organs. How many arms does a squid have? How many tentacles?
How are annelid worms different from flatworms and roundworms?
Like flatworms, annelids have a mesoderm with muscle, a central nervous system, and an excretory system. In addition to a more specialized complete digestive system, annelid worms have also evolved body features not found in flatworms or nematodes.
How are earthworms different from roundworms and flatworms?
They do not have a coelom, respiratory system or a circulatory system. Tapeworms flukes are examples of flatworms. Roundworms are part of the phylum Nematoda. Segmented worms have a true coelom, a circulatory system and a digestive system.An earthworm is a segmented worm.
What characteristic distinguishes the earthworms from other worms?
Structural Characteristics An earthworm’s body is streamlined and every segment contains a number of bristles called setae. The streamlined shape helps the earthworm travel through soil, and the bristles improve grip if the soil is wet. Circular muscles surround every segment of an earthworm’s body.