Lower and Higher Invertebrates with their differences

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Last Updated on May 21, 2020 by Sagar Aryal

Lower and Higher Invertebrates with their differences

The invertebrates are usually classified as Lower Invertebrates and Higher Invertebrates.

Lower Invertebrates

  • The lower invertebrates are simple in body organization.
  • They are generally small in size.
  • These are thought to have originated in the main lines of evolution, near the base of the phylogenetic tree of Animal kingdom.
  • Lower Invertebrates includes Protozoa, Porifera, Coelenterata (Cnidaria), Platyhelminthes and Nematoda.

Higher Invertebrates

  • They possess a complex body organization.
  • They are generally larger in size.
  • These occupy a higher position in the phylogenetic tree of Animal kingdom.
  • Higher Invertebrates include Mollusca, Annelida, Arthropoda, and Echinodermata.

Lower and Higher Invertebrates

On the basis of some important features, there are some differences between lower and higher invertebrates as shown below:

Table 1: Differences between Lower Invertebrates and Higher Invertebrates

S.N.

Characteristics

Lower Invertebrates

Higher Invertebrates

1.SizeSmaller in sizeLarger in size
2.Body organizationBody organization simpleBody organization complex
3.SymmetryRadial, biradial or no symmetryBilateral symmetry
4.Germ LayersGerm layers wanting or 2 or 3 germ layersThree germ layers present
5.CoelomNo Coelom or a pseudo-coelomTrue Coelom
6.Mouth and AnusGenerally, no separate mouth and anusMouth and Anus are separate
7.Muscular GutAbsentPresent
8.Blood Vascular SystemNot well developedWell developed

 References

  1. Kotpal RL. 2017. Modern Text Book of Zoology- Invertebrates. 11th Edition. Rastogi Publications.
  2. Jordan EL and Verma PS. 2018. Invertebrate Zoology. 14th Edition. S Chand Publishing.

Lower and Higher Invertebrates with their differences

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