Calocyclas

Marine Biology / Micropaleontology

Calocyclas pendant

Calocyclas is a marine zooplankton protist from the class Radiolaria. The single-celled amoeboid inhabitant and maker of this shell feeds by extruding pseudopods out through the holes in the shell, snagging prey and dragging it into the shell to be devoured. Fossils of the Radiolaria are found on the ocean floor as the so-called ‘siliceous ooze.’ Ernst Haeckel described its shape as “a three-chambered shell; head with a strong, three-sided horn, bell-shaped thorax protected with many long radial spikes, and a wide abdomen with a wreath of many large vertical feet.”

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