Radiolarian - Cyrtolagena laguncula
Although it seems a beautiful glass bottle, it is a radiolarian, a tiny marine protozoan that measures less than one millimeter. Radiolarians are single celled, but quite complex, sophisticated organisms. They form intricate, mineral structures or skeletons (test). This one in the photo, scientifically named Cyrtolagena laguncula, is from the South Atlantic, and has long, slender, conical test made of pure opal, with 7-10 or more annulated joints; the maximum length of test is 144-185 µm.
[Protoctista - Actinopoda - Polycystina - Nassellaria - Theoperidae - Cyrtopera - C. laguncula]. This species was previously named Cyrtopera laguncula.
Photo credit: ©Wim van Egmond