Anapsid and Diapsid

Opposite meaning words

Anapsid noun - Primitive reptile having no opening in the temporal region of the skull; all extinct except turtles.

Show all Definitions

Diapsid is an antonym for anapsid.

Diapsid noun - Reptile having a pair of openings in the skull behind each eye.

Show all Definitions

Anapsid is an antonym for diapsid.

Once considered anapsid, Captorhinus from Middle Permian has revealed to be a diapsid relative; this has happened as well to another animal, Hylonomus (see just below).

Source: Useful Notes / Prehistoric Life - Non-Dinosaurian Reptiles

Cite this Source

Diapsid and Anapsid. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/anapsid/diapsid

Anapsid & Diapsid. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/anapsid/diapsid>.

Diapsid or Anapsid. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/anapsid/diapsid.

Google Ngram Viewer shows how "anapsid" and "diapsid" have occurred on timeline