MARINE AND BRACKISH-WATER CENTROHELIDS (C ENTROHELIOZOA, SARCODINA) OF KANDALAKSHA BAY OF THE WHITE SEA

A SEM-study of seven marine and brackish-water species of Centrohelioz oa from Kandalaksha Bay of the White Sea is carried out. These are: He terophrys marina Hertwig & Lesser, Cienkowskya mereschkowskyi (Cienk.) , Raphidiophrys marina Ostenfeld, R. pedunculata sp. n., Choanocystis kareliensis sp. n., C. pelagica (Ostenfeld) and Acanthocystis saphonov i sp. n. C. kareliensis is characterized by dumb-bell-shaped lamellar scales with well-developed medial constrictions and straight spicules with acute apices lacking apical teeth. A. saphonovi is characterized by bean-shaped lamellar scales and straight cylindrical spicules each with a spiral rib extending from the base-plate to the apex and bearin g numerous minute denticles; slightly dilated apices of spicules bear 10 to 15 marginal teeth. R. pedunculata is the second known stalked ce ntroheliozoon; it has two types of scales: short ones, ca. 8x1 mcm (on the cell body and base of the stalk) and long ones, ca. 17x1 mcm (on the medial part of the stalk); both types of scales have smooth factur e.