Echiura

Characteristic paired trump of an echiurian worm in Maldives.

The Echiura, or spoon worms, are a small group of marine animals. Once treated as a separate phylum, they are now universally considered to represent derived annelid worms, which have lost their segmentation. The majority of echiurans live in shallow water, but there are also deep sea forms. More than 230 species have been described. The Echiura fossilise poorly and the earliest known specimen is from the Upper Carboniferous (Pennsylvanian). However, U-shaped fossil burrows that could be Echiuran have been found dating back to the Cambrian.

单词	Echiuroidea
释义	Echiuroidea 英汉-汉英词典棘尾门词组 \| 习惯用语您要查找的是不是： echinoderm n. 棘皮动物 Eucharistic adj. 圣体圣事网络短语: Echiuroidea 虫动物门; 虫益门; 螠虫门; 螠纲; 英语百科 Echiura The Echiura, or spoon worms, are a small group of marine animals. Once treated as a separate phylum, they are now universally considered to represent derived annelid worms, which have lost their segmentation. The majority of echiurans live in shallow water, but there are also deep sea forms. More than 230 species have been described. The Echiura fossilise poorly and the earliest known specimen is from the Upper Carboniferous (Pennsylvanian). However, U-shaped fossil burrows that could be Echiuran have been found dating back to the Cambrian.
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Echiuroidea

您要查找的是不是：

网络短语:

Echiura