anapsid
Definition
Noun: 1. A type of reptile characterized by a skull with no openings (fenestrae) in the temporal region behind the eyes: This is a major taxonomic group (subclass Anapsida) defined by this skull structure. All members of this group except turtles are extinct.
Examples of Usage
- Noun:
- The turtle is the only surviving anapsid.
- Fossils of early anapsids provide clues about reptile evolution.
- Scientists study the anapsid skull structure to understand primitive reptilian anatomy.
Advanced Usage
- In taxonomic classification: The term is used scientifically to classify reptiles within the subclass Anapsida, contrasting with diapsids (like lizards and crocodiles) and synapsids (like mammals and their ancestors).
- The classification of turtles as anapsids has been debated based on genetic evidence.
Variants and Related Words
- Anapsida (n): The scientific subclass name for the group of anapsid reptiles.
- Anapsid skull (n phrase): The specific skull structure defining this group.
Synonyms
- Anapsid reptile (n phrase): A more descriptive synonym.
- (Scientific) Member of the subclass Anapsida (n phrase).
Antonyms
- Diapsid (n): A reptile whose skull has two openings in the temporal region (e.g., lizards, snakes, crocodiles, birds).
- Synapsid (n): An amniote whose skull has one opening in the temporal region (e.g., mammals and their extinct relatives).
Noun
-
primitive reptile having no opening in the temporal region of the skull; all extinct except turtles
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