Pinaciophora marina Nicholls, 2013


Diagnosis: Cells 12-22 µm in diameter covered in imbricate, generally circular or (occasionally) slightly elliptical plate-scales, 3.5-5.8 µm in diameter. Scales consisted of two layers joined at the peripheral margin with a slightly thickened rim, about 0.10-0.15 µm wide. The distal layer of the scale was perforated with generally two series of holes, an outer series of 7-13 holes and an inner group of 1-7 holes; hole size (0.22-0.42 µm in diameter) was not necessarily determined by location on the scales. Generally, the largest holes were located in the outer series and smallest holes in the inner region of the scale; holes of the large type were never found to represent the inner series occupying the central area of the scale unless only 1-2 such holes were present in that part of the scale. Some scales included an apparently rare occurrence of 1-2 tiny holes (0.1 µm) at unpredictable positions on the scales. The underside (proximal surface) of the plate-scales appears thin and semi-transparent in SEM, often revealing the holes of the upper (distal) surface.


Ecology: Marine. Type locality: Pacific Ocean beach near Gillatt (Grassy) Island, Haida Gwaii (Queen Charlotte Islands), British Colµmbia, Canada (53.241ON, 131.898OW).