Titlebook: Animal Diversity; Diana R. Kershaw Book 1983 D. R. Kershaw 1983 Agnatha.Chaetognatha.Crustacea.Ctenophora.Insecta.Integument.Phylum Kinorh

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https://doi.org/10.1007/978-88-470-1062-8mates. There are five major coelomate phyla: Annelida, Arthropoda, Mollusca, Echinodermata and Chordata, with many minor phyla. Apart from their possession of a coelom, all these animals show greater complexity than pseudocoelomate and acoelomate forms. For instance, a through gut and a circulatory

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Niccolò Faccioli,Riccardo Manfredihazardous process involving repeated cell divisions and cell movement to permit organ development and growth. Embryonic development, that is the development of the individual within the fertilized egg, may be a short or lengthy process. A short embryonic stage, which is more usual in invertebrates,

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https://doi.org/10.1007/978-88-470-0690-4le the invertebrate fossil record extends back over 1,600 million years, fossils of the earliest vertebrates are only 500 million years old. However, in spite of their relatively recent emergence, chordates have established themselves as one of the major animal phyla, with dominance of the water, la

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https://doi.org/10.1007/978-88-470-0690-4eries of small skeletal structures, the vertebrae. These are associated with the notochord during embryonic development but in most cases replace it in adults. Like the notochord the vertebral column functions as an axial supporting rod, but it has the additional function of protecting the nerve cor

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