Book : Zoology
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Posted by: CHELSEA
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Writer CHELSEA

Vertebrates and Invertebrates

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Defination 

Animals can be classified into two main groups: vertebrates and invertebrates. The main difference between vertebrates and invertebrates is that invertebrates, like insects and flatworms, do not have a backbone or a spinal column. Examples of vertebrates include humans, birds, and snakes.

comparison

Vertebrates About-Animals with an internal skeleton made of bone are called vertebrates. Kingdom-Animalia Physical characterstics- Well-developed internal skeleton; highly developed brain; have advanced nervous system; outer covering of protective cellular skin. examples: Parrots, Humans, snakes etc Classifications- Classified into five groups: fish, amphibians, reptiles, birds, and mammals. Phylum- Chordata Size- Big in size. Species-2% of the animal species are vertebrates. Numer of species-57,739 Invertebrates About- Animals without a backbone Kingdom- Animalia Physical Characteristics- Multicellular; no back bone; no cell walls; reproduce sexually;heterotrophic. Examples- Insects, flatworms etc. Classification - 30 phyla Phylum- Chordata Size- Small and slow moving. Species- 98% of animal species are invertebrates. Number of species- ~2 million named, many millions more not yet identified


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