Paleobiogeographical radiolarian provinces in the Devonian

Geographical distribution of Devonian radiolarians is analyzed and four radiolarian provinces and six subprovinces are recognized for the first time: Euramerican (North American, European, Ural, and Northern subprovinces), Siberian, Paleoasiatic (South China and Japan subprovinces), and Australian. The provinces differ in morphological characters of skeletons, number of genera and species, and frequencies of particular taxa. The term “aboriginal” species is proposed to designate species that constantly dwell in a province or subprovince during certain period.