Chinese Hat Radiolarian

The radiolarian Litharachnium eupilium (Haeckel, 1887). Originally described by Haeckel as Sethophormis eupilium. Top insert shows the shape of the cephalus ; bottom insert shows Haeckel's 1887 illustration from Plate 56 of the Challenger Expedition monograph. Specimen from 250m depth, Point C on March 27th 2018