Round worms or sometimes known as Nematodes are a type of worm. These worms are truly remarkable, they can be found almost anywhere. From land to water, from rain forests to high up in the mountains, and even in Antarctica even in the human body! These are just a type of worm there is thousands of different smaller species with in this particular group of invertebrate. Most round worms are only 2.5 millimetres in length and sometimes even microscopic. Round worms are slender and their heads are actually very distinctive. They have either 3 or 6 lips and have a set of small teeth behind the lips. These worms only have 1 layer of cells which is covered by a thick collagenous cuticle, sometimes the collagenous cuticle can be made up of 3 layers.
I got my information from:
http://www.wettropics.gov.au/pa/pa_lowly_worm.html
http://en.wikipedia.org/wiki/Nematode
do they have an exoskeleton or endoskeleton?
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