In the embryo an undifferentiated mesodermal component of an early trunk or tail segment or metamere, derived from paraxial mesoderm.
在,一个无法区别的中组成一个早期干、或尾部片段或体节,衍生自轴旁的中。
7 The strobila of cestodes consists of a chain of segments (proglottids) budded off from the neck region.
虫的节裂区由从颈部出芽生殖的体节链(节片)组成。
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Like these two animals, its body is made up of a number of rings.
跟龙虾和虾,蟹的体也体节组成的。
And metanephridia will have a nephrostome on onside of a segment.
后肾管在体节的侧具有肾口。
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