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Calocyclas is a marine 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. 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."

The jewelry is created by 3D-printing in wax followed by metal casting in solid bronze.

Originally priced at 97 Euro, this item is ready to ship. All items are gift-wrapped in original, recyclable Ontogenie packaging and then shipped insured by registered mail, worldwide.

The pendant will be shipped with a rose gold-plated, gold-plated or non-plated sterling silver anchor chain, 45cm (18 inch) long and 1.5mm (.06 inch) wide depending on whether you order the bronze, brass or silver pendant.

The pendant is 3.3cm wide by 4.6cm tall.

Frequently asked questions about Ontogenie

All of my designs are achieved by 3D-printing combined with lost wax casting. If I have the piece you want in stock, I can usually ship it the next day. If it isn't in stock, please allow 3 weeks for printing until I can ship it.
All of my pieces are gift wrapped in Ontogenie recycled paper boxes containing shredded wood and finished with twine.

SALE - 25% OFF - Plankton Calocyclas - Radiolarian pendant in bronze - Marine Biology - Science Jewelry


  • Handmade item
  • Material: bronze
  • Primary color: Bronze
  • Material: bronze
  • Made to order
  • Ships worldwide from Germany
  • Feedback: 40 reviews
  • Favorited by: 33 people