Rhizaria

Definition

Rhizaria are a supergroup of mostly unicellular eukaryotes characterized by their amoeboid movement and the presence of complex shell structures. They are important in ecological roles such as nutrient cycling and as indicators in paleontological studies.

5 Must Know Facts For Your Next Test

1. Rhizaria include important groups like foraminiferans, radiolarians, and cercozoans.
2. Many Rhizaria possess intricate mineralized shells made of silica or calcium carbonate.
3. They typically exhibit amoeboid movement using long, thin pseudopodia called filopodia or axopodia.
4. Rhizaria play a crucial role in marine ecosystems, particularly in the formation of sedimentary rocks through their deposits.
5. Some members of Rhizaria are known to be parasitic, affecting plants and other organisms.

Review Questions

Related terms

Foraminiferans: A group of Rhizaria known for their calcareous shells and significant role in marine sediments.

Radiolarians: A subgroup of Rhizaria with intricate silica-based skeletons, often found in oceanic plankton.

Cercozoans: Diverse group within Rhizaria that includes free-living and parasitic species with various feeding strategies.