Rhizaria from Boundless Biology

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4. • The needle-like pseudopodia are used to carry out a process called cytoplasmic
streaming which is a means of locomotion or distributing nutrients and oxygen.
• Two major subclassifications of Rhizaria include Forams and Radiolarians.
• Forams are characterized as unicellular heterotrophic protists that have porous
shells, referred to as tests, which can contain photosynthetic algae that the foram
can use as a nutrient source.
• Radiolarians are characterized by a glassy silica exterior that displays either
bilateral or radial symmetry.
Rhizaria
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www.boundless.com/biology/protists/groups-of-protists/rhizaria
<em>Ammonia tepida </em>
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Protists > Groups of Protists

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Appendix

6. Key terms
• pseudopodia temporary projections of eukaryotic cells (CC BY-SA 3.0)
• test the external calciferous shell of a foram (CC BY-SA 3.0)
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Protists

7. Forams
These shells from foraminifera sank to the sea floor.
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Protists

8. Radiolarian shell
This fossilized radiolarian shell was imaged using a scanning electron microscope.
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Protists

9. <em>Ammonia tepida </em>
<em>Ammonia tepida</em>, a Rhizaria species viewed here using phase contrast light microscopy, exhibits many threadlike pseudopodia.
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Protists

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Protists
Which of these describes the largest difference between the
shells of Foraminiferans and Radiolarians?
A) Foram shells are made of calcium carbonate, while Radilarians have
shells made of silica.
B) Foram shells dissolve when the organism dies, while Radiolarian
shells sink to the bottom.
C) Foram shells have pointy spines,while Radiolarian shells are
completely smooth.
D) Foram shells exhibit radial symmetry, while Radiolarian shells exhibit
bilateral symmetry.

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Boundless - LO. "Boundless." CC BY-SA 3.0 http://www.boundless.com/
Protists
Which of these describes the largest difference between the
shells of Foraminiferans and Radiolarians?
A) Foram shells are made of calcium carbonate, while Radilarians have
shells made of silica.
B) Foram shells dissolve when the organism dies, while Radiolarian
shells sink to the bottom.
C) Foram shells have pointy spines,while Radiolarian shells are
completely smooth.
D) Foram shells exhibit radial symmetry, while Radiolarian shells exhibit
bilateral symmetry.

12. Attribution
• Connexions. "Groups of Protists." CC BY 3.0 http://cnx.org/content/m44617/latest/?collection=col11448/latest
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Protists