Test small ovoid in shape with siliceous scales in alternating transverse rows; pseudostome terminal;
cell body does not fill the test completely; nucleus posterior (Kudo, 1966).
Paulinella chromatophora Lauterborn,
test 27 μm long, 20 μm wide, pseudostome 3 μm wide,
x 640, Kawaguchi Natural Park, Sashima, Kawaguchi city, Saitama Pref., Japan, January 29, 2005 by Y. Tsukii
94 μm; x 640