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Many protists have protective shells or te … Many protists have protective shells or tests, usually made from silica (glass) or calcium carbonate (chalk). Protists are mostly single-celled and microscopic. Their shells are often tough, mineralised forms that resist degradation, and can survive the death of the protist as a microfossil. Although protists are typically very small, they are ubiquitous. Their numbers are such that their shells play a huge part in the formation of ocean sediments and in the global cycling of elements and nutrients. global cycling of elements and nutrients.
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...extinct fossil
, Diatoms, major components of marine plankton, have silica skeletons called frustules. "The microscopic structures of diatoms help them manipulate light, leading to hopes they could be used in new technologies for light detection, computing or robotics.
, This is a microfossil from the Middle Ordovician with four nested spheres. The innermost sphere is highlighted red. Each segment is shown at the same scale.
, Shell of a spherical radiolarian
, Exploded drawing of the shell, D = dorsal plate, G = girdle plate, S = shield plate and V = ventral plate.
, Size comparison between the relatively large coccolithophore Scyphosphaera apsteinii and the relatively small but ubiquitous coccolithophore Emiliania huxleyi
, Shell micrographs
, Triparma laevis and a drawing of its silicate shell, scale bar = 1 μm.
, ...have plates called coccoliths
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closely replicate some radiolarian shell patterns
, Drawings by Haeckel 1904
, Diatoms have a silica shell with radial or bilateral symmetry
, Foraminiferans are important unicellular zooplankton [[#Marine protists
, Coccolithophores build calcite skeletons important to the marine carbon cycle
, Triparma laevis belongs to the Bolidophyceae, a sister taxon to the diatoms.
, Computer simulations of Turing patterns on a sphere
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Costs of having shells
, Coccolithophores
, Fossil radiolarian
, Diatom shapes
, Foraminiferan shapes
, Coccolithophore shells
, Diatoms
, Radiolarian shapes
, Benefits of having shells
, Foraminiferans
, Turing and radiolarian morphology
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Haeckel Diatomea 4.jpg
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Many protists have protective shells or te … Many protists have protective shells or tests, usually made from silica (glass) or calcium carbonate (chalk). Protists are mostly single-celled and microscopic. Their shells are often tough, mineralised forms that resist degradation, and can survive the death of the protist as a microfossil. Although protists are typically very small, they are ubiquitous. Their numbers are such that their shells play a huge part in the formation of ocean sediments and in the global cycling of elements and nutrients. global cycling of elements and nutrients.
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