Radiolarians are a very diverse microzooplanktonic group, often distributed in regionally restricted assemblages and responding to specific environmental factors. These properties of radiolarian assemblages make the group more conducive for the development

We studied the distribution of polycystine radiolarians in the northern South China Sea (SCS) in September 2005 in order to document the relation between radiolarian assemblages and environmental parameters. Vertical plankton tows were collected at depth-intervals

Particle trap samples (VERTEX) from 4 locations in the northeast Pacific were used to compare centric and pennate diatoms with nassellarian and spumellarian radiolarians. The proportion of pennates and nassellarians were highest at VERTEX 3 from the northeast