海林檎 Cystoids
（重定向自Cystoidea）
海林檎是已灭绝的一类棘皮动物，是棘皮动物中最古老、骨骼组织最简单的一纲。形状为球形，与苹果类似，故名（林檎为苹果的古称）。具有萼和腕，萼部骨板（萼板）多达13至200块，萼板上具有板孔，沟孔系统复杂。海林檎纲约有100属左右，多生活在奥陶纪和志留纪，于泥盆纪晚期绝迹。
cystoidea
/si'stɔidiə/
英汉-汉英词典
海林檎纲
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- idealist n. 空想家，理想主义者；唯心主义者 adj. 理想主义的；唯心主义的
- idealistic adj. 理想主义的；空想的
- vicissitude n. 变化；变迁；兴败；盛衰 n. [古诗]代谢；交替；沉浮
- associated adj. 联合的,关联的
cystoidea n. 海林檎纲（一种棘皮动物）
中文百科
英语百科
Cystoids
Cystoidea or cystoids, is a class of extinct echinoderms in the sub-phyla Blastozoa, that lived attached to the sea floor by stalks.
They existed during the Paleozoic Era, in the Middle Ordovician and Silurian Periods, until extinction in the Devonian Period.
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