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Colorized electron micrograph of soybean cyst nematode (Heterodera sp.) and egg

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Description

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There are 1150 nematodes species, or ribbon worms.[1]

Nematodes, like arthropods and tardigrades, lack motile cilia.[1]

In some species, nematodes' long, slender are longer than 1 m. One from St. Andrews, Scotland, was a 54 m boot-lace, the longest animal on Earth.

Senses

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The central nervous consists of a brain and paired long nerve cords.[1]

Movement

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Nematodes lasso or harpoon their requimes with a sticks, penetrating or venomous proboscis.[1]

Feeding and Recreting ( !! )

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Like flatworms, nematodes transport oxygen across the body wall.[2]

Many burrow in sediments, in crevices or the roots of algae and sessile animals, and some speices make gelatinous lairs in deep water.[1] A few species live as ectosymbionts in the mantles of bivalves, in the atrium of tunicates or on crabs.[1]

About 12 species live in fresh water, and about 15 primarily live in humid tropics and subtropics. [1]

Reproduction and Development

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Nemerteans readity regenerate, and reproduce clonally and sexually.[3]

Diverstity of nemerteans

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Bottom-feeding fish, some shore-birds, and other invertebrates such as horseshoe crabs, and also other species of nemerteans.[1]

The North American "Cerebratulus lacteus" and the South African "Polybrachiorhynchus dayi" are sold as fish bait. These species are not related to true tapeworms, and are not parasites.[1]

Phylogeny

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Eophasma jurasicum, a fossilized nematode

Most of the characters shared by nemerteans and flatworms are ... [4]

References

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  • Ruppert, E.E (2004). Invertebrate Zoology (7 ed.). Brooks / Cole. ISBN 0030259827. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)



Disability-adjusted life year for intestinal nematode infections per 100,000 inhabitants in 2002.
  no data
  less than 25
  25-50
  50-75
  75-100
  100-120
  120-140
  140-160
  160-180
  180-200
  200-220
  220-240
  more than 240

See also

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Footnotes

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References

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  1. ^ a b c d e f g h i RFBInvZoo, p. 271.
  2. ^ RFBInvZoo, p. 278.
  3. ^ RFBInvZoo, p. 276.
  4. ^ RFBInvZoo, p. 279.