Comparative Ultrastructure and the Evolution of Nemertines
Comparative Ultrastructure and the Evolution of Nemertines
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纽虫的比较超微结构和进化
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
E. Ruppert
中科院分区：
文献类型：
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作者：
J. M. Turbeville;E. Ruppert
纽形动物传统上被认为是具有血管系统和容纳可翻转的喙的专门腔的无腔动物，或者是具有形成喙腔、侧血管和性腺囊的修改的体腔腔的体腔动物。比较超微结构的数据，如细胞极性，足细胞和中胚层细胞的发生与不发达的纤毛长鼻，rhynchocoel，侧和背侧血管，和性腺衬里是一致的，他们的解释为修改体腔发现，类似的，在高等水蛭。这些以及有关13个物种的肌肉组织、结缔组织、神经胶质样细胞和配子的其他数据证实，纽形动物的组织等级介于成熟的体腔和体腔之间。然而，超微结构的细节比较表明，他们的acoelomate属性从一个更典型的腔肠条件下进化。
Nemertines are traditionally viewed as acoelomates with blood vascular systems and a specialized cavity housing an eversible proboscis, or, as coelomates with modified coelomic cavities forming the rhynchocoel, lateral vessels and gonadal sacs. Comparative ultrastructural data such as cell polarity, the occurrence of podocytes and mesodermal cells with rudimentary cilia for proboscis, rhynchocoel, lateral and dorsal vessels, and gonadal linings are consistent with their interpretation as modified coelomic cavities as found, analogously, in the higher leeches. These and additional data regarding musculature, connective tissue, glia-like cells and gametes for 13 species affirm that nemertines are intermediate between full-blown coelomate and acoelomate grades of organization. A comparison of ultrastructural details, however, indicates that their acoelomate attributes evolved secondarily from a more typical coelomate condition.