class Aphasmidia

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Definition
  1. Noun:
    • A taxonomic subgroup of Nematoda: "Class Aphasmidia" is a term used in some biological classification systems to denote one of two major subgroups within the phylum Nematoda (roundworms). It is characterized by the absence of phasmids, which are sensory organs found in the other subgroup.
Usage
  • Noun:
    • In certain taxonomic schemes, nematodes are divided into the Class Aphasmidia and the Class Phasmidia.
    • The researcher studied the morphological features distinguishing Class Aphasmidia from other nematodes.
Advanced Usage
  • "to be placed in Class Aphasmidia": to be classified within this specific taxonomic group.
    • Many free-living marine nematodes are placed in Class Aphasmidia.
Variants and Related Words
  • Aphasmid (adj): Pertaining to or characteristic of the Class Aphasmidia.
    • The aphasmid condition refers to the lack of phasmid sensory structures.
  • Phasmidia (n): The other major subclass of nematodes, characterized by the presence of phasmids.
Synonyms
  • Adenophorea: This is a synonymous class name used in other classification systems for the same group of nematodes lacking phasmids.
  • Non-phasmid nematodes: A descriptive term for nematodes not possessing phasmids.
Notes on Meaning
  • Taxonomic Context: The term "Class Aphasmidia" is specific to the science of taxonomy (biological classification). Its usage and validity depend on the particular classification system being employed. In modern systems, the group may be referred to by other names (e.g., Adenophorea).
  • Defining Characteristic: The primary defining feature is the absence of phasmids, which are caudal sensory organs present in many other nematodes.
Noun
  1. one of two subgroups of Nematoda used in some classification systems

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