Test (biology)
Test (biology)
Hard shell of some spherical marine animals.
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Readers' pathsAug 2026 – Oct 2026
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Sea urchin
Class of marine invertebrates.
24%
Scale insect
Superfamily of insects.
17%
Foraminifera
Phylum of amoeboid protists.
9.3%
Protist
Eukaryotes other than animals, plants or fungi.
8.4%
Radiolaria
Phylum of single-celled organisms.
7.1%
Colobocentrotus atratus
Species of sea urchin.
6.8%
Seed
Reproductive structure in plants.
4.4%
Ambulacral
Anatomical term.
2.7%
Ascidiacea
Paraphyletic class of tunicates comprising sea squirts.
1.5%
Phyllacanthus imperialis
Species of sea urchin.
1.5%
Readers come from
Share of the 2,626 readers arriving from another article
Sand dollar
Order of sea urchins.
25%
Xenophyophorea
Clade of single-celled organisms.
14%
Cellulose
Polymer of glucose and structural component of cell wall of plants and green algae.
12%
Sea urchin
Class of marine invertebrates.
12%
Cryogenian
Second period of the Neoproterozoic Era, with major glaciation.
8%
Foraminifera
Phylum of amoeboid protists.
4.3%
Ascidiacea
Paraphyletic class of tunicates comprising sea squirts.
3.5%
Seashell
Hard, protective outer layers created by an animal that lives in the sea.
3.2%
Exoskeleton
External skeleton of an organism.
1.9%
Scala dei Turchi
Rocky cliff on the coast of Realmonte, southern Sicily, Italy.
1.7%