The topologic architecture of metazoan trace fossils may be subdivided into 3 clusters, 8 basic topologic configurations, 3 combined topologic configurations and 21 topoichnologic kinds, which are considered to be related to ethologic classifications of trace fossils in origin.

Analysis of their morphologies and features leads to the conclusi on that these structures might have been in connection with metazoan activity, bu t the possibility of their abiotic origin can not be ruled out.

The late Neoproterozoic is an important period of biological evolution; and the emergence of metazoa is a representative event, which marked the history of biology evolution having entered a new era.

Studies to estimate the origin time of the Metazoa using molecular data have been steadily increasing in recent years.

Size structure of the metazoan zooplankton community in a tropical lake: Xinghu Lake, South China;

The ecological study of metazoan zooplankton was conducted on eight typical sampling stations in Jingpo Lake during April 2006, July 2006, October 2006 and January 2007.

Species diversity of metazooplankton was analyzed based collection from 2000 to 2006.