By J. W. Valentine, H. Hamilton (auth.), R. A. Fortey, R. H. Thomas (eds.)
The arthropods comprise extra species than the other animal staff, however the evolutionary pathways which resulted in their present range are nonetheless a topic of controversy. Arthropod Relationships offers an outline of our present realizing, responding to the recent info bobbing up from sequencing DNA, the invention of recent Cambrian fossils as direct facts of early arthropod historical past, and developmental genetics. those new parts of analysis have inspired a reconsideration of classical morphology and embryology. ArthropodRelationships is the 1st synthesis of the present debate to emerge: now not because the quantity edited through Gupta was once released in 1979 has the arthropod phylogeny debate been, thought of during this intensity and breadth.
Leaders within the quite a few branches of arthropod biology have contributed to this quantity. Chapters concentration gradually from the final concerns to the explicit difficulties related to specific teams, and thence to a attention of embryology and genetics. This wide selection of disciplines is drawn directly to method an figuring out of arthropod relationships, and to supply the main well timed account of arthropod phylogeny.
This booklet can be learn via evolutionary biologists, palaeontologists, developmental geneticists and invertebrate zoologists. it is going to have a unique curiosity for post-graduate scholars operating in those fields.
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Additional resources for Arthropod Relationships
Journal of Zoological Systematics and Evolutionary Research, 33, 75-80. W. and Wetzel, R. (1994) Nucleic acid sequence data are not per se reliable for inference of phylogenies. Journal of Natural History, 28, 749-61. Walossek, D. (1993) The Upper Cambrian Rehbachiella and the phylogeny of the Branchiopoda and Crustacea. Fossils and Strata, 32, 1-202. Walossek, D. and Miiller, KJ. (1992) 'The Alum Shale Window' - contribution of 'Orsten' arthropods to the phylogeny of Crustacea. Acta Zoologica, 73, 305-12.
Science, 260, 340-2. , Cartwright, P. Y. (1993) Arthropod phylogeny: a combined approach. Cladistics, 9, 1-39. , Backeljau, T. and De Wachter, R (1995a) Phylogeny of protostome worms derived from 18S rRNA sequences. Molecular Biology and Evolution, 12, 641-9. , De Wachter, R, Kumar, S. and Garey, lR (1995b) 18S rRNA data indicate that Aschelminthes are polyphyletic in origin and consist of at least three distinct clades. Molecular Biology and Evolution, 12, 1132-7. 3 A defence of arthropod polyphyly G.
A case in point is that of the myodocopines, the only extant ostracods that have compound eyes. There is no evidence that they inherited these from earlier ostracods (Fryer, 1996, Figure 4) and Parker (1995) has recently produced evidence of their independent evolution. The basal stocks of some arthropod lineages appear to have been (or are) eyeless. Camera-type eyes have evolved many times in the animal kingdom. Spiders and scorpions have such eyes, which is difficult to explain if their ancestors had compound eyes.