Invertebrate zoology

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Invertebrate zoology is the biological discipline that consists of the study of invertebrate animals, i.e. animals without a backbone (a structure which is found only in fish, amphibians, reptiles, birds and mammals.)

Invertebrates are a vast and very diverse group of animals that includes sponges, echinoderms, tunicates, numerous different phyla of worms, molluscs, arthropods and many additional phyla. Single-celled organisms or protists are usually not included within the same group as invertebrates.


Invertebrates are 97% of all named animal species,[1] and because of that fact, this subdivision of zoology has many further subdivisions, including but not limited to:

These divisions are sometimes further divided into more specific specialties. For example, within arachnology, acarology is the study of mites and ticks; within entomology, lepidoptery is the study of butterflies and moths, Myrmecology is the study of ants and so on.


  1. ^ May, Robert M. (16 September 1988). "How Many Species Are There on Earth?". Science 241 (4872): 1441–1449. doi:10.1126/science.241.4872.1441. JSTOR 1702670. PMID 17790039. 

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