Holasteroida

Ceratophysa ceratopyga by A. Agassiz (1881)

Holasteroida is an order of irregular sea urchins.

These irregular sea urchins are characterized by a particularly marked bilateral symmetry, including for the apical system, which is highly elongated. In some contemporary abyssal groups such as Pourtalesiidae, some species are even bottle-shaped. The mouth (peristome) does not contain an Aristotle's lantern. The anus (periproct) has migrated towards the peripher of the test. The plastron is never amphisternous.

单词	Holasteroida
释义	Holasteroida /ˌhɔlə'stə:rɔidə/ 英汉-汉英词典全星海胆目词组 \| 习惯用语您要查找的是不是： asteroid n. [天文]小行星；海盘车；小游星 adj. 星状的 cholesterol n. 胆固醇 asteroidal adj. 星状的 interscholastic adj. 学校间的；校际的 Holasteroida n. [无脊椎] 全星海胆目英语百科 Holasteroida Holasteroida is an order of irregular sea urchins. These irregular sea urchins are characterized by a particularly marked bilateral symmetry, including for the apical system, which is highly elongated. In some contemporary abyssal groups such as Pourtalesiidae, some species are even bottle-shaped. The mouth (peristome) does not contain an Aristotle's lantern. The anus (periproct) has migrated towards the peripher of the test. The plastron is never amphisternous.
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Holasteroida /ˌhɔlə'stə:rɔidə/

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Holasteroida