This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Radiolaria Challenger Plate . follows Plate Collosphrida Diam Fig Trypanosphra transformata sp living colony The centre of the spherical cnobium contains large alveole surrounded by net of sarcode The entire calymma is filled up by smaller thinwalled alveoles Its inner part contains numerous small young central capsules each