Figs 16–20 in Coccolithophorids in Polar Waters: Quaternariella and Porsildia gen. nov. Mercedesia gen. nov., Ericiolus,

Figs 16–20. Ericiolus frigidus. TEM whole mounts from Antarctica (EPOS). 16 – detail of anterior cell end showing the entangled armor of nannoliths with the most solid spine pointing outwards; 17 – detail of single nannoliths showing the tetrads of spines; the outwardly projecting spine (arrows) is more robust than the other three spines; 18 – more robust single nannolith; the arrow points to the outwardly directed spine; 19 – whole cell with extended flagella and a somewhat shorter haptonema; notice the highly characteristic heart-shaped cell body; 20 – a second example of a heart-shaped coccopshere with appendages.