Fig. 6 in Notes on the Occurrence of Tintinnid Ciliates, and the Nasselarian Radiolarian Amphimelissa setosa of the Marine Microzooplankton, in the Chukchi Sea (Arctic Ocean) Sampled each August from 2011 to 2020

Fig. 6. Morphological variability of Ptychocylis obtusa found in a single sample. The 18 cells shown were the first properly orientated cells encountered in a sample aliquots from Station 9 of the 2014 cruise. Certain individuals shown have lorica morphologies resembling those of forms recognized as distinct species of Ptychocylis: P. drygalski (C) and P. acuta (F and O).