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jmdict 2026150 Active (id: 2100137)

ディメトロドン
1. [n]
▶ dimetrodon



History:
3. A 2021-04-15 12:06:50  Jim Breen <...address hidden...>
  Comments:
Yes, not a dinosaur. Best not to try and go further - we don't label mammals, reptiles, etc.
  Diff:
@@ -9 +9 @@
-<gloss>dimetrodon (synapsid)</gloss>
+<gloss>dimetrodon</gloss>
2. A* 2021-04-15 10:11:33  Chase <...address hidden...>
  Refs:
https://en.wikipedia.org/wiki/Dimetrodon#:~:text=Dimetrodon (%2Fda%C9%AA%CB%88m,member%20of%20the%20family%20Sphenacodontidae.

"Dimetrodon is often mistaken for a dinosaur or as a contemporary of dinosaurs in popular culture, but it became extinct some 40 
million years before the first appearance of dinosaurs. Reptile-like in appearance and physiology, Dimetrodon is nevertheless 
more closely related to mammals than to modern reptiles, though it is not a direct ancestor of mammals."
  Comments:
The dimetrodon was before dinosaurs and more closely related to mammals than to lizards (dinosaurs). They are classified under 
synapsid. Although synapsid is probably less known, it is incorrect to label them as dinosaurs.
  Diff:
@@ -9 +9 @@
-<gloss>dimetrodon (dinosaur)</gloss>
+<gloss>dimetrodon (synapsid)</gloss>
1. A 2004-11-17 00:00:00 
  Comments:
Entry created

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