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. 2020 Oct 30;6(44):eabc9123. doi: 10.1126/sciadv.abc9123

Fig. 2. Modern and fossil coccolithophore cell wall coverings.

Fig. 2

(A and B) Scanning electron microscopy (SEM) image showing disarticulated coccoliths (A) and complete coccosphere (B) [Danian, Newfoundland Ridge, Integrated Ocean Drilling Program (IODP) Site 1407 sample 1407A-23-2, 50 cm]. (C) Light microscope (LM) image showing modern coccospheres of Coccolithus in culture as an example of nonflagellate, diploid, heterococcolith coccospheres. Cells from culture experiments performed in (58) using a North Atlantic open ocean isolate RCC1197. (D) SEM and LM images of complete Danian diploid, heterococcolith coccospheres with flagellar openings (additional examples in fig. S2). The SEM Praeprinsius are from Newfoundland Ridge (upper specimen from sample 1407C-20-4, 125 cm, and lower from sample 1407A-23-2, 35 cm). Prinsius from a North Sea well sample (see table S2) and both Futyania are from Blake Nose sample 1049C-8-4, 38 cm. The LM images of Praeprinsius are from 1407A-23-2, 50 cm, and those of Futyania are from 1407C-20-4, 125 cm. Modified circumflagellar coccoliths are shown in green for Futyania. (E) Modern coccospheres with flagellar openings [from (27)]. (F) LM image showing cell (Prymnesium parvum) with flagella (f) and haptonema (h) [from (26)].