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Type: Article
Published: 2007-12-21
Page range: 313–325
Abstract views: 74
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Crustacean classification: on-going controversies and unresolved problems*

Department of Zoology, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom
Crustacea Linnaeus taxonomy phylogeny morphology fossils

Abstract

The journey from Linnaeus’s original treatment to modern crustacean systematics is briefly characterised. Progress in our understanding of phylogenetic relationships within the Crustacea is linked to continuing discoveries of new taxa, to advances in theory and to improvements in methodology. Six themes are discussed that serve to illustrate some of the major on-going controversies and unresolved problems in the field as well as to illustrate changes that have taken place since the time of Linnaeus. These themes are: 1. the treatment of parasitic Crustacea, 2. the affinities of the Remipedia, 3. the validity of the Entomostraca, 4. exopodites and epipodites, 5. using larval characters in estimating phylogenetic relationships, and 6. fossils and the crustacean stem-lineage. It is concluded that the development of the stem lineage concept for the Crustacea has been dominated by consideration of taxa known only from larval or immature stages. This has limited our understanding of key events in the origin of crown group Crustacea.

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