therapsid: meaning, definition, pronunciation and examples
Very LowTechnical / Scientific
Quick answer
What does “therapsid” mean?
A fossil reptile belonging to an extinct order from the Permian and Triassic periods, considered an evolutionary precursor to mammals.
Audio
Pronunciation
Definition
Meaning and Definition
A fossil reptile belonging to an extinct order from the Permian and Triassic periods, considered an evolutionary precursor to mammals.
Any member of the order Therapsida, characterized by more mammal-like skeletal and dental features than earlier reptiles, often discussed in the context of the evolutionary transition from reptiles to mammals.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling and pronunciation are consistent.
Connotations
None beyond its strict scientific definition.
Frequency
Extremely rare in both varieties, confined to specialist contexts.
Grammar
How to Use “therapsid” in a Sentence
The [ADJECTIVE] therapsid [VERBed]...[NOUN] is a classic example of a therapsid.Vocabulary
Collocations
Examples
Examples of “therapsid” in a Sentence
adjective
British English
- The therapsid fossils were carefully catalogued.
- This specimen shows clear therapsid characteristics.
American English
- The therapsid fossils were carefully cataloged.
- This specimen shows distinct therapsid traits.
Usage
Meaning in Context
Business
Not used.
Academic
Used in palaeontology, evolutionary biology, and earth science papers and lectures to describe a key group in vertebrate evolution.
Everyday
Virtually never used in everyday conversation.
Technical
The primary context. Used with precision to classify fossils and discuss anatomical transitions, e.g., therapsid jaw articulation, therapsid dentition.
Vocabulary
Synonyms of “therapsid”
Strong
Neutral
Weak
Vocabulary
Antonyms of “therapsid”
Watch out
Common Mistakes When Using “therapsid”
- Mispronouncing as /ˈθɛrəpsɪd/ (THER-a-psid).
- Using it as a general term for any prehistoric reptile.
- Misspelling as 'therapisid' or 'therapside'.
FAQ
Frequently Asked Questions
No, therapsids are not dinosaurs. They are a separate, earlier group of reptiles that are more closely related to mammals. Most therapsids went extinct before dinosaurs became dominant.
One of the best-known therapsids is Lystrosaurus, a hardy, herbivorous genus that survived the Permian-Triassic mass extinction and was widespread in the Early Triassic.
Therapsids are critically important in evolutionary history because they represent the transitional forms that link early reptiles to modern mammals, showing the gradual development of features like differentiated teeth and more upright limb posture.
Therapsids first appeared in the Middle Permian period, around 275 million years ago, and most lineages died out by the end of the Triassic, about 200 million years ago, though one subgroup (cynodonts) gave rise to the first true mammals.
A fossil reptile belonging to an extinct order from the Permian and Triassic periods, considered an evolutionary precursor to mammals.
Therapsid is usually technical / scientific in register.
Therapsid: in British English it is pronounced /θɪˈræpsɪd/, and in American English it is pronounced /θəˈræpsɪd/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: 'THE RAPID evolution of these reptiles led to MAMMALS.' (Therapsid -> The Rapid -> mammal precursor).
Conceptual Metaphor
THE BRIDGE or TRANSITIONAL FORM (conceptualized as a link between two distinct states: reptile and mammal).
Practice
Quiz
Therapsids are best described as: