Arbaciidae皇冠海膽科 - Coelopleurus undulatus 棘刺的特徵 (feature of Primary spines)
1. 一級棘刺呈高度彎曲、無環節，遠端末稍為紅色，往近端處漸轉為綠色。
2. 一級棘刺領環背面中脊兩邊無脊但有許多小顆粒。
3. 一級棘刺領環腹面有許多縱脊。
4. 二級刺皆呈球棒狀。
1. 一級棘刺呈高度彎曲、無環節，遠端末稍為紅色，往近端處漸轉為綠色。
Coelopleurus undulatus：
Primary spines are highly curved and unbanded; red distally (on the dorsal surface) blending into green proximally, typically just above the spine's collar.
2. 一級棘刺領環背面中脊兩邊無脊但有許多小顆粒。
Coelopleurus undulatus：
The collar's dorsal surface is highly granular with no ridges either side of the central dorsal ridge.
3. 一級棘刺領環腹面有許多縱脊。
Coelopleurus undulatus：
The collar's ventral surface has many longitudinal ridges.
4. 二級刺皆呈球棒狀。
Coelopleurus undulatus
All secondary spines are club-shaped.
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