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首页> 外文期刊>Canadian Journal of Zoology >Ultrastructure of the postcorpus of the esophagus of Teratocephaluslirellus (Teratocephalida) and its use for interpreting characterevolution in Secernentea (Nematoda)
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Ultrastructure of the postcorpus of the esophagus of Teratocephaluslirellus (Teratocephalida) and its use for interpreting characterevolution in Secernentea (Nematoda)

机译：食蟹畸形（Teratocephalida）食管后体的超微结构及其在解释Secernentea（Nematoda）的性状进化中的用途

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摘要

The ultrastructure of the postcorpus of the putative outgroup of Secernentea (Nematoda). teratocephalus lirellus (Teratocephalida), is compared with previous observations of representative species Zeldia punctata (Cephalobina), Caenorhabditis elegans (Rhabditina), and Diplenteron sp. (Diplogastrina) in order to interpret the evolution of feeding structures within Secernentea. The postcorpus of T lirellus consists of 6 marginal, 13 muscle, 3 gland, and 11 nerve cells. In both T. lirellus and Z. punctata, one duct from each of two subventral glands opens into the esophageal lumen at the junction of the isthmus and the basal bulb, whereas in C. elegans and Diplenteron sp., homologous openings are at the posterior end of the median bulb. Caenorhabditis elegans and Z punctata each have two additional glands that open within the basal bulb. The postcorpus of each taxon has four anterior-to-posterior layered sets of radial muscle cells, except in Diplenteron sp., which lacks a grinder and has homologs to the anterior two sets only. The anterior set of muscles of T. lirellus and Z punctata includes six mononucleate cells, whereas the homolog in C. elegans and Diplenteron sp. includes three binucleate cells. Evaluation of character polarity defines Rhabditina and Diplogastrina as sister taxa, and suggests that the character of five glands may result from functional convergence.
机译：Secernentea（Nematoda）假定的外群后体的超微结构。将teratocephalus lirellus（Teratocephalida）与以前的代表性物种Zeldia punctata（Cephalobina），Caenorhabditis elegans（Rhabditina）和Diplenteron sp。的观察结果进行了比较。 （Diplogastrina），以解释Secernentea内部进食结构的演变。小花T的后躯由6个边缘，13个肌肉，3个腺体和11个神经细胞组成。在T. lirellus和P. punctata中，两个腹膜下腺各自的一个导管在峡部和基底球的交界处进入食管腔，而在秀丽隐杆线虫和Diplenteron sp。中，同源开口在后部中位数灯泡的末端。秀丽隐杆线虫和点状线虫每个都有两个额外的腺体，在基底球内开放。除Diplenteron sp。中没有角磨机且仅与前两组具有同源性的Diplenteron sp。外，每个分类单元的后体都有四组从前至后的层状径向肌细胞。 T. lirellus和Z punctata的前肌包括六个单核细胞，而秀丽隐杆线虫和Diplenteron sp。的同系物。包括三个双核细胞。字符极性的评估将Rhabditina和Diplogastrina定义为姊妹类群，并暗示五个腺体的字符可能是功能融合造成的。

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