Some observations on the internal morphology of Hansen's nauplius y (Crustacea)
Some observations on the internal morphology of Hansen's nauplius y (Crustacea)
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汉森无节幼体（甲壳类）内部形态的一些观察
DOI：
10.1080/00364827.1971.10411186
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发表时间：
1971
期刊：
影响因子：
--
通讯作者：
R. Elofsson
中科院分区：
文献类型：
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作者：
R. Elofsson
摘要 Hansen (1899) 称为无节幼体 y 的甲壳类幼虫形式的内部形态揭示了一种非常先进的早期无节幼体。神经系统发育良好，分化良好。它与复眼的原基相连。推测 SPX 器官的丝状基底与这些相连。无节幼体的眼睛以三部分的形式存在，每个杯中有两个视网膜细胞。消化道由外胚层食管和内胚层中肠组成，外胚层食管具有纵向肌肉的内层和外圆形层，内胚层中肠的细胞具有紧靠管腔的微绒毛边界。没有直肠或肛门。有发达的肌肉系统。头部包含一个大腺体和一对腹侧出口。描述了一种功能可疑的新背尾器官。这项调查中提出的形态学事实表明，按照今天的知识，无节幼体 y 与无节幼体 (Cirpedia) 很接近。
Abstract The internal morphology of the crustacean larval form that Hansen (1899) called nauplius y has revealed a remarkably advanced early nauplius. The nervous system is well developed and differentiated. It is connected with the anlagen of the compound eyes. A presumed filamentous base of the SPX-organ connects with these. The nauplius eye is present in a three-partite form with two retinula cells in each cup. The alimentary canal consists of the ectodermal oesophagus with an inner layer of longitudinal muscles and an outer circular layer, and of the endodermal midgut with cells having microvillous borders against the lumen. There is no proctodeum or anus present. There is a well-developed muscular system. The head contains a large gland with a paired ventral outlet. A new dorsocaudal organ of doubtful function is described. The morphological facts presented in this investigation indicate that the nauplius y, as knowledge stands today, is close to the Cirripedia.