diapsid
Definition
Noun: A diapsid is a reptile characterized by having two temporal openings (fenestrae) in the skull behind each eye. This skull structure is a key evolutionary feature distinguishing diapsids from other reptile groups.
Usage
The term "diapsid" is used in scientific and paleontological contexts to classify and describe reptiles based on this specific cranial anatomy. * Birds and crocodiles are both modern descendants of ancient diapsids. * The fossil's skull clearly shows the paired openings, identifying it as a diapsid.
Advanced Usage
- Diapsid condition: Refers specifically to the state of having the two pairs of skull openings.
- The evolution of the diapsid condition was a major step in reptile history.
Variants and Related Words
- Diapsida (noun, plural): The larger taxonomic group (subclass) that includes all diapsid reptiles.
- The subclass Diapsida includes lizards, snakes, tuataras, crocodilians, and birds.
Synonyms
- Diapsid reptile: A more descriptive synonym.
Different Meanings
The word "diapsid" has a single, specific zoological meaning related to skull morphology and does not have other common definitions.
Noun
-
reptile having a pair of openings in the skull behind each eye
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