tripylæa

Century Dictionary and Cyclopedia

1. n. An order of silicoskeletal Radiolaria, whose central capsule has a single nucleus, a double membrane, and more than one perforate area, the polar aperture being supplemented by one or more other openings. The skeleton is diversiform, often composed of tubes, and the capsule is pigmented with phæodium. Hertwig, 1879. Also called Phæodaria.