Cryptocephalans - Cryptocephalans

Japanese: 空椎類 - くうついるい
Cryptocephalans - Cryptocephalans

…the first large group of terrestrial quadrupeds (vertebrates) with rigid skulls and complex vertebrae. They include the Labyrinthodonts (subclass) and the Lazybones (subclass). Labyrinthodonts [Yoshikazu Hasegawa]. …

*Some of the terminology explanations that mention "empty vertebrae" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…陸生四足(脊椎)動物として最初に現れた大動物群で,堅い頭骨を備え複雑な椎骨をもっていた。これには迷歯類(亜綱)と空椎類(亜綱)が含まれる。迷歯類【長谷川 善和】。…

※「空椎類」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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