http://www.youtube.com/watch?v=dYPF5dmT__o
Nematodes, better known as roundworms, are invertebrates that inhabit various environments. Some nematodes are parasites, organisms that live and feed off a host. Most of them are microscopic organisms, but some aren't. These organisms, however, contain the same basic structure. The outer layer of a nematode is unique. Instead of being made of cells, it is a thick layer of cellular material and nuclei with no membranes to divide them into cells. Inside this outer layer, are long muscles that aid it in movement. These muscles stretch the length of the Nematode and allow it to bend and twist from side to side just as a snake would. Because some Nematodes live in water, it is hard for them to move in this way, but it does propel them slightly. Usually, it is easier for them to move along with the current of the water. Nematodes also have heads which contain small sensory organs and a neck that is made of muscles as well.
http://www.ucmp.berkeley.edu/phyla/ecdysozoa/nematoda.html
http://entnemdept.ufl.edu/creatures/nematode/soil_nematode.htm
Nematodes, better known as roundworms, are invertebrates that inhabit various environments. Some nematodes are parasites, organisms that live and feed off a host. Most of them are microscopic organisms, but some aren't. These organisms, however, contain the same basic structure. The outer layer of a nematode is unique. Instead of being made of cells, it is a thick layer of cellular material and nuclei with no membranes to divide them into cells. Inside this outer layer, are long muscles that aid it in movement. These muscles stretch the length of the Nematode and allow it to bend and twist from side to side just as a snake would. Because some Nematodes live in water, it is hard for them to move in this way, but it does propel them slightly. Usually, it is easier for them to move along with the current of the water. Nematodes also have heads which contain small sensory organs and a neck that is made of muscles as well.
http://www.ucmp.berkeley.edu/phyla/ecdysozoa/nematoda.html
http://entnemdept.ufl.edu/creatures/nematode/soil_nematode.htm