→ goldfishert: 下周期中考呢orz 考完再來看 11/07 11:28
最新一期的SCIENCE刊載了一篇
Phylogenomics resolves the timing and pattern of insect evolution
http://www.sciencemag.org/content/346/6210/763.full
ABSTRACT
Insects are the most speciose group of animals, but the phylogenetic
relationships of many major lineages remain unresolved. We inferred the
phylogeny of insects from 1478 protein-coding genes. Phylogenomic analyses of
nucleotide and amino acid sequences, with site-specific nucleotide or
domain-specific amino acid substitution models, produced statistically robust
and congruent results resolving previously controversial phylogenetic
relations hips. We dated the origin of insects to the Early Ordovician [~479
million years ago (Ma)], of insect flight to the Early Devonian (~406 Ma), of
major extant lineages to the Mississippian (~345 Ma), and the major
diversification of holometabolous insects to the Early Cretaceous. Our
phylogenomic study provides a comprehensive reliable scaffold for future
comparative analyses of evolutionary innovations among insects.
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