Dissertation > Biological Sciences > Zoology > Animal evolution and development

Phylogeny Reconstruction Using Partial 18SrDNA on Animal Phyla Including Mollusk Hierarchy

Author LiuJianMin
Tutor WuZuo;LiJiGang
School Hebei University
Course Zoology
Keywords Molluscs Molecular Phylogeny Bayesian inference 18SrDNA
CLC Q951
Type Master's thesis
Year 2007
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This paper studies the case of Pakistan , including eight snails, mollusks door Gang representatives and various gastropods representatives of the General Division , 22 animal phyla part 18SrDNA sequence characteristics. The results show that a multi- line molluscs occur, but cephalopods and multi- plate Gang mutually sister group . Snail superfamily within Bradybaena Branch , tidal snail families, large families can not Snails ML 18SrDNA sequence analysis consistent with the traditional classification system phylogeny speculate. ML and BI consensus tree analysis showed that there is an appropriate ode root conditions, in addition to the asymmetric animals and animal echinoderms radial symmetry outside a monophyletic ; including nematodes animals, animal jaw stomach no body cavity , including animals three germ layers polyphyletic origin . ML unrooted tree does not support the existence of a body cavity according false characterized classification system . ML and BI trees were split body cavity multi- department of animal combinations . In addition, including brachiopods and animals , including insects broom tentacle crown animals monophyletic ; flat plate animals and animals formed a monophyletic comb jellyfish , which indicated that the old system Coelenterata split Cnidaria and phylum Ctenophora are reasonable, it also implies flat plate animals and sponges composed of lateral whether a monophyletic animal , whether it is a true metazoan monophyly of issues worthy of further study.

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