Different Axis Type - Ijikugata

...Axial organisms have no symmetrical surfaces, so they are called asymmetrical (asymmetrical) (amoebas, sponges, snail shells, etc.). Axial organisms include coaxial and heteroaxial organisms, the former having the same kind of axis that passes through one point inside the body and extends in all directions, i.e. spherical organisms, and this form is called universal symmetry. Examples of this type include primitive organisms such as the protozoan radiolarians, sunfish, and the green algae Volvox, as well as animal egg cells.

*Some of the terminology used to refer to "different axis type" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…無軸型は相称面をもたないので，このようなものを無相称(不相称)という(アメーバ，カイメン，巻貝など)。有軸型には同軸型と異軸型が含まれ，前者は体内の1点を通ってあらゆる方向にのびる同種の軸をもつもの，つまり球形の生物で，この形態を全面相称(普遍相称)という。原生動物の放散虫類やタイヨウチュウ，緑藻のボルボックスなど原始的な生物や，動物の卵細胞などがこれにあたる。…

※「異軸型」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