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首页> 外文期刊>Biology Bulletin >The Morphology of Laubieriopsis sp. (Polychaeta, Fauveliopsidae) and the Position of Fauveliopsids in the Polychaete System
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The Morphology of Laubieriopsis sp. (Polychaeta, Fauveliopsidae) and the Position of Fauveliopsids in the Polychaete System

机译：Laubieriopsis sp。的形态（Polychaeta，Fauvelioopsidae）和Fauveliopsids在Polychaete系统中的位置

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摘要

The external and internal morphology of Laubieriopsis sp. from the North Sea was studied using light, scanning, and transmission microscopy. The morphology of the head end, parapodia, pigidium, body cavity, digestive tract, nervous system, and reproductive system was analyzed. The studied species was most similar to L. cabiochi (Amoreux, 1982) but displayed some significant differences. The body consists of 22 set-igers (versus 21 setigers of L. cabiochi), bears bidentate modified aciculae in four anterior segments, and has paired genital papillae (unpaired in L. cabiochi) located on the eighth segment. Parapodia of the 5th-22nd segments bear one long capillary chaeta and one very short and thin chaeta in each ramus. The anterior part of the body capable of invaginating (forming an introvert) comprises only the prostomium and peristomium and does not include the first segment, as is typical of flabelligerids. The oral cavity contains well-developed dorsolateral ciliary folds. The ventral pharyngeal organ is undetectable. The ciliary folded esophagus is a straight tube without a loop even in an inverted head. The gut forms a small loop in the region of the 17th segment. The body cavity is divided by well-developed dissepiments and mesenteries, forming an intricate system of partitions in the anterior part of the body. The neuron bodies of the ventral nerve cord are homog-enously distributed without forming distinct ganglia; however, the nerve cord forms two or three swellings in each segment. The position of fauveliopsids in the polychaete system is discussed. This study did not find any traits of fauveliopsids similar to Flabelligeridae and close taxa.
机译：Laubieriopsis sp。的外部和内部形态。使用光，扫描和透射显微镜对来自北海的海藻进行了研究。分析了头端，截瘫，pig，体腔，消化道，神经系统和生殖系统的形态。所研究的物种与L. cabiochi（Amoreux，1982）最相似，但表现出一些显着差异。尸体由22个前臂组成（而对L. cabiochi则为21个前臂），在四个前段带有双齿修饰的球菌，在第八个段上有成对的生殖器乳头（在L. cabiochi中不成对）。第5至第22节段的截瘫在每个支腔中具有一个长的毛细血管和一个非常短而细的毛孔。能够翻身（形成内向）的身体前部仅包括前tom和骨膜，不包括第一部分，就像前鞭毛一样。口腔含有发达的背外侧睫状褶皱。腹咽器官不可检测。睫状折叠食管是直管，即使在倒置头中也没有环。肠道在第17段区域形成一个小环。体腔被发达的牙本质和肠系膜分开，在身体的前部形成了复杂的隔板系统。腹神经索的神经元体均匀分布而没有形成明显的神经节。然而，神经索在每个节段中形成两个或三个肿胀。讨论了包虫在多毛囊系统中的位置。这项研究没有发现任何与Flabelligeridae和近缘类群相似的fauveliopsids性状。

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