The Earliest Arthropods and Other Animals
A bacterial mat cover of sea-bottoms during the 1 st Epoch of the Cambrian (the Terreneuvian) hindered entire bodies to be preserved.What we find is dominantly isolatedparts,‘small shelly fossils.More active burrowing then removed the mats,with the apparent ‘explosion of life forms in the 2nd Cambrian Stage as one of the results.Many phyla have their first fossil appearance in the 2nd Stage.Some of them were already ‘modem in their morphology and have not evolved much since.The arthropods provide an interesting example of the opposite situation.They are represented by many species and by well-preserved fossils,many of which are surprisingly little derived.The material thus opens for studies of the primary radiations.The related dinocaridids represent an interesting case of convergence including the development of segmented appendages.Both these groups have their roots among the lobopods.
Arthropoda Cambrian radiation Cambrian explosion Dinocaridida
Jan Bergstr(o)m
Swedish Museum of Natural History,Department of Palaeozoology,P.O.Box 50007,SE-104 05Stockholm,Sweden
国际会议
The Darwin 200 Beijing International Conference (纪念达尔文诞辰200周年国际学术会议)
北京
英文
28-42
2009-10-24(万方平台首次上网日期,不代表论文的发表时间)