title: The First Finding of Radiolaria Arachnocorys circumtexta Haeckel, 1860 and the Bottom Microalgae in Brown Alga Cystoseira barbata (Stackhouse) C.A. Agardh Epiphyton (Crimea, Black Sea)
abstract: The planktonic species Radiolaria of Arachnocorys circumtexta Haeckel, 1860 (Radiolaria, class Nasseillaria, family Lophophaenidae Haeckel, emend. Petrushevskaya, 1971) in the epiphyton of the brown alga Cystoseira barbata (Stackhouse) C.A. Agardh in August 2002 in Martynov Bay (Sevastopol, Crimea) at a depth of 2.5 m at a water temperature of 24.4°C and a salinity of 18‰ was the first time in the Black Sea. Before, this species was indicated by E. Haeckel in the Mediterranean Sea plankton. For 
journal: Russian Journal of Biological Invasions