Arcellidae
Definition
Proper noun A family of testate amoebae, characterized by having a shell (test) composed of organic material, often with incorporated mineral particles. They are commonly found in soil and freshwater habitats and have a worldwide distribution.
Usage
The word "Arc ellidae" is used as a taxonomic family name in scientific classification (biology, protistology). It is always capitalized.
Examples * Under the microscope, several species belonging to the family Arc ellidae were observed in the pond water sample. * The study focused on the diversity of Arc ellidae in peatland ecosystems. * Arc ellidae are important bioindicators for assessing water quality.
Advanced Usage
- Phylogenetic Context: In modern taxonomic revisions, the classification of testate amoebae is frequently updated. The family Arc ellidae is placed within the order Arcellinida.
- Morphological Description: Members of the family Arc ellidae possess a unilocular shell (test) with a single, central aperture (pseudostome) through which pseudopodia extend for locomotion and feeding.
Variants and Related Words
- Arcellid (noun, informal): A common term used by researchers to refer to an individual organism belonging to the family Arc ellidae.
- The sediment was rich in arcellids.
- Arcellinida (proper noun): The order to which the family Arc ellidae belongs.
Synonyms
- Shelled amoebae (general descriptive term, not a taxonomic synonym)
- Testate amoebae (general descriptive term for the group containing Arc ellidae)
Related Terms & Context
- Protozoa: A historical, polyphyletic grouping of single-celled eukaryotic organisms, which includes organisms like those in Arc ellidae.
- Amoebozoa: The larger phylogenetic supergroup that includes Arc ellidae.
- Test/Lorica: The protective shell or case secreted by an arc ellid.
- Pseudopodia: Temporary projections of cytoplasm used for movement and feeding by arc ellids.
Noun
-
soil and freshwater protozoa; cosmopolitan in distribution
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