Clamp ultrastructure of the basal monogenean Chimaericola leptogaster (Leuckart, 1830) (Polyopisthocotylea: Chimaericolidae)

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• 作者：Larisa G. Poddubnaya (1)
  Willy Hemmingsen (2)
  David I. Gibson (3)
  
• 关键词：Monogenea ; Ultrastructure ; Haptoral clamps ; Relict fauna ; Chimaericola ; Hard structures
• 刊名：Parasitology Research
• 出版年：2014
• 出版时间：November 2014
• 年：2014
• 卷：113
• 期：11
• 页码：4023-4032
• 全文大小：3,300 KB
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• 作者单位：Larisa G. Poddubnaya (1)
  Willy Hemmingsen (2)
  David I. Gibson (3)
  
  1. I. D. Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, 152742, Borok, Yaroslavl Province, Russia
  2. Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics, University of Troms酶, 9037, Troms酶, Norway
  3. Department of Life Sciences, Natural History Museum, Cromwell Road, London, SW7 5BD, UK
  
• ISSN：1432-1955

文摘

The ultrastructure of the haptoral clamps of the chimaericolid monogenean Chimaericola leptogaster, a basal polyopisthocotylean from the gills of a holocephalan fish, is described. These clamps are characterized by the presence of two muscle blocks interrupted mid-anteriorly and mid-posteriorly and different kinds of hard structures: a single median and paired lateral sclerites embedded in the clamp wall; six spine-like structures directed towards the clamp lumen; and electron dense surface structures along the internal surface of the anterior clamp lips and along the luminal surface of the tegument of the clamp lumen. The lateral sclerites are situated deep within muscular tissue and are closely bounded by radial myofibrils, possessing a uniform electron dense matrix within which are hollow areas of different sizes. The median sclerite occupies an area between the clamp wall myofibrils and the luminal epithelium, is surrounded by a basement lamina and is composed of a heterogeneous matrix comprising two different morphological layers related to variations in the type and concentration of fibrils. Four of the spine-like structures are extensions of the margins of the two spindle-like muscle blocks in the clamps, i.e. the two anterior and two posterior structures, and the two others are situated at the lateral constrictions of the left and right muscle blocks. The electron dense surface structures are derivations of the clamp tegument or, to be more precise, its outer, densely fibrous region. These results are discussed in relation to the evidence that the haptoral clamps of C. leptogaster are apparently ancient origin.