dibranchiata
Definition
- Noun:
- A taxonomic subclass of cephalopods: "Dibranchiata" refers to a subclass of cephalopod mollusks characterized by having two gills. It comprises all living cephalopods except those in the family Nautilidae, including orders such as Octopoda (octopuses) and Decapoda (squids and cuttlefish).
Usage Examples
- Noun:
- The class Cephalopoda is divided into the subclasses Nautiloidea and Dibranchiata.
- Squids and octopuses, belonging to the Dibranchiata, are known for their complex nervous systems.
Advanced Usage
- In scientific classification: The term "Dibranchiata" is used primarily in zoological and paleontological contexts to categorize a major group of cephalopods based on anatomical features like gill number and shell structure.
- The fossil record shows a divergence between the Nautiloidea and the Dibranchiata lineages.
Variants and Related Words
- Dibranchiate (adj): Having two gills. This adjective describes the characteristic feature of the subclass.
- Dibranchiate cephalopods like the cuttlefish have a closed circulatory system.
Synonyms
- Two-gilled cephalopods: A descriptive synonym emphasizing the defining physical trait.
- Coleoidea: In modern taxonomic systems, "Coleoidea" is often the preferred term for this group, which includes all cephalopods with internal shells or no shells, except the nautiluses.
Related Phrases / Terms
- Subclass Dibranchiata: The full taxonomic designation.
- The subclass Dibranchiata exhibits a greater diversity of forms than the nautiluses.
Noun
-
comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish)
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