1、
you have the ornithorphynchus and also the image of what is called the echinoidea type.
一种是鸟类形状，另一种是所谓的海胆类形状。
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2、
"echinoid: an echinoderm of the class Echinoidea, which includes the sand dollars and sea urchins."
“海胆：一种属于海胆纲的棘皮动物，包括沙钱和海胆.”
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3、
Study on lipid and fatty acids composition of three kinds of echinoidea's gonad
三种海胆性腺总脂的脂肪酸组成的研究
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