Invertebrate is a term coined by Jean-Baptiste Lamarck to describe any animal without a spinal column. It therefore includes all animals except those in the subphylum Vertebrata (fish, reptiles, amphibians, birds and mammals).
Lamarck divided these animals into two groups, the Insecta and the Vermes, but now, they are classified into over 30 phyla, from simple organisms such as sponges and flatworms to complex animals such as arthropods and mollusks.
Since invertebrates include all animals except a certain group, invertebrates form a paraphyletic group, but, despite not forming a "natural group" (that is, monophyletic), "invertebrate" is still a widely used term. Invertebrates include 97% of all animal species.
More on [ Invertebrate ]
Invertebrates :: Exotic
Animalia :: Flora and Fauna

Coleopterists Society - An international organization devoted to the study of systematics, biology and conservation of beetles.
Environmental Entomology - Invertebrate and freshwater macroinvertebrate surveys and databases, environmental impact assessments and invertebrate conservation
Meta Description: [ Environmental Entomology, Invertebrate and Freshwater Macroinvertebrate Surveys, Bird and Insect Databases, Environmental Impact Assessments, Invertebrate Conservation ]
Insect Conservation and the UK - Giving information on the biodiversity action plans and links to sites with biodiversity information.
Invertebrate Conservation Research Centre - University of Natal, Pietermaritzburg, South Africa, established in 1992, aiming to undertake research that directly enhances the continued survival of invertebrates, especially insects.
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Spider Conservation - Information about the threats to US spiders and their conservation.
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