Distribution des thanatocénoses récentes de radiolaires dans l'Atlantique nord-oriental et le sud de la mer de Norvège

The relative abundance of five groups of radiolarian species (nasselarians and spumellarians) in the thanatocoenoses within the recent sediments from 64^oN to the Equator is described. Four types of thanatocoenoses of Radiolarians and several subtypes are distinguished and in the broadest sense four major faunal zones can be delimited: north of 60^oN, a subarctic zone, a boreal zone, a subtropical zone whose boundary runs approximately along 45^oN and, south of 13^oN, a tropical zone. The correlations between the faunal provinces and climatic belts are more gradual in the low and intermediate latitudes than in the high latitudes