Development of Perviata and Vestimentifera (Pogonophora)
Development of Perviata and Vestimentifera (Pogonophora)
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Perviata 和 Vestementifera (Pogonophora) 的发育
作者：
E. Southward
现有知识的胚胎和幼虫发育的perviate和vestimentiferan pogonophorans进行了审查。两组都报道了一种螺旋劈理形式，但需要进一步澄清。研究的perviates有大蛋黄的鸡蛋，孵化在母亲管纤毛定居阶段。其他较小的卵尚未被研究，但可能有浮游幼虫。海鲶类有小型卵和浮游的非摄食性幼虫。通过比较perviates和vestimentiferans的发育，可以得出这两个类群属于同一个高等类群的结论。由于两者的纤毛定居阶段在纤毛的形成和最初在两个体节上发育毛类的方式上类似于环节动物的担轮藻，因此表明它们是环节动物的关系。
Existing knowledge of the embryonic and larval development of perviate and vestimentiferan pogonophorans is reviewed. A form of spiral cleavage has been reported from both groups, but further clarification is desirable. The perviates studied have large yolky eggs, incubated in the maternal tube to a ciliated settlement stage. Others with smaller eggs are still unstudied, but may have pelagic larvae. Vestimentiferans have small eggs and pelagic, non-feeding larvae. Comparisons of the development of perviates with that of vestimentiferans lead to the conclusion that the two groups belong to one higher taxon. An annelidan relationship is indicated because the ciliated settlement stages of both are like annelid trochophores in their ciliation and in the way they develop chaetae initially on two segments.