Tetraselmis wettsteinii (Schiller) Throndsen comb. nov. and its occurrence in golfo di Napoli

Abstract
Carteria wettsteinii Schiller (1913) has been isolated from Golfo di Napoli and investigated by means of electron microscopy which revealed micro-anatomical features characteristic of the genus Tetraselmis. The species is commonly present in Golfo di Napoli during summer with cell numbers 102–106 cells-litre−1, occasionally producing blooms of 107 cells·litre−1.