subclass malacostraca
Học thuậtThân thiện
A marine biologist carefully examines a specimen from the subclass Malacostraca.
Definition
Noun: - A major taxonomic subclass within the class Crustacea: This subclass encompasses the largest and most familiar group of crustaceans, including numerous marine, freshwater, and terrestrial species. It is characterized by a body plan typically consisting of a head with five segments, a thorax with eight segments, and an abdomen with six segments (plus a telson).
Usage
- The term is used in scientific, biological, and zoological contexts to classify a specific, large group of crustaceans.
- It is a formal taxonomic rank (subclass) and is primarily used in academic writing, research, and educational materials.
Examples
Advanced Usage
- In phylogenetic studies, the subclass Malacostraca is discussed in relation to other crustacean subclasses like Branchiopoda or Maxillopoda.
- The monophyly (common ancestry) of the subclass Malacostraca is well-supported by morphological and molecular data.
Variants and Related Words
- Malacostracan (noun/adjective): A member of the subclass Malacostraca; pertaining to this subclass.
- Isopods and amphipods are both malacostracan crustaceans.
- Eumalacostraca: A taxonomic superorder within the subclass Malacostraca that includes the most advanced members like decapods (crabs, lobsters).
Synonyms
- Higher crustaceans: An informal, descriptive term sometimes used to refer to members of this large and complex subclass.
- (Note: In precise scientific taxonomy, "subclass Malacostraca" has no direct synonym, as it is a specific classificatory term.)
Related Idioms/Phrases
- (None. This is a highly specific scientific term and is not used in idiomatic expressions.)
A marine biologist carefully examines a specimen from the subclass Malacostraca.
Noun
- largest subclass of Crustacea including most of the well-known marine, freshwater, and terrestrial crustaceans: crabs; lobsters; shrimps; sow bugs; beach flies