Arthropod Phylogenetic Chronology

Qun Yang ； Xiaoyan Sun ； Ping Wu ； Keyun Zhang

《Journal of Genetics and Molecular Biology》 14卷3期 (2003/09) Pp. 145-158

https://doi.org/10.30047/JGMB.200309.0004

並列摘要

Phylogenetic chronology or phylochronogy deals with reconstructing the timetable for the phylogenetic events during the evolutionary history of organisms. It utilizes not only traditional time data in biostratigraphic record (fossil occurrences), but also phylogenesis-related molecular divergence events recovered through molecular clock analysis. This study attempts to combine 18S rDNA divergence time and fossil record of major groups in Arthropoda together with previous studies, showing that Arthropoda diverged from other protostome animals about 540 to 1000 Ma during Neoproterozoic; within pancrustaceans, Myodocopa (Ostracoda) first diverged from other pancrustaceans about 600 Ma in latest Precambrian; other major pancrustacean groups (Podocopida, Branchiura, ancestors of Maxillopoda, Branchiopoda and Malacostraca) evolved 580 Ma during the latest Precambrian Vendian Period shortly after the myodocopid appearance; Branchiopoda, Malacostraca and Maxillopoda diverged around 540 Ma during Cambrian or latest Vendian time, while Hexapoda evolved from a branchiopod branch (anostacans) during Silurian. Although studies on phylochronology are just beginning and the error margins are still significant in molecular estimation, the subject represents an important interdisciplinary field that future evolutionary biology must focus on.

並列關鍵字

Arthropoda ； Branchiopoda ； phylochronology ； molecular paleontology ； 18S rDNA