DNA barcoding supports identification of Malacobdella species (Nemertea: Hoplonemertea)

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• 作者：Jose E F Alfaya (1) (2)
  Gregorio Bigatti (1) (2)
  Hiroshi Kajihara (3)
  Malin Strand (4)
  Per Sundberg (5)
  Annie Machordom (6)
  
  1. LARBIM ; IBIOMAR- Centro Nacional Patag贸nico (CENPAT) ; CONICET ; Bvd. Brown 2915 ; U9120ACV ; Puerto Madryn ; Chubut ; Argentina
  2. Facultad de Ciencias Naturales ; Universidad Nacional de la Patagonia San Juan Bosco (UNPSJB) ; Bvd. Brown S/N ; U9120ACV ; Puerto Madryn ; Chubut ; Argentina
  3. Faculty of Science ; Hokkaido University ; Kita 10 ; Nishi 8 ; Kita-ku ; Sapporo ; 060-0810 ; Japan
  4. The Swedish Species Information Centre ; SLU ; B盲ckl枚sav盲gen 10 ; Box 7007 ; SE-750 07 ; Uppsala ; Sweden
  5. Department of Biological and Environmental Sciences ; University of Gothenburg ; Medicinaregatan 18 ; PO Box 463 ; SE-40530 ; Gothenburg ; Sweden
  6. Museo Nacional de Ciencias Naturales (MNCN) ; CSIC ; Jos茅 Guti茅rrez Abascal ; 2 ; 28006 ; Madrid ; Spain
  
• 关键词：DNA barcoding ; COI gene ; Bivalvia ; Entocommensal nemertean ; Malacobdella
• 刊名：Zoological Studies
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：54
• 期：1
• 全文大小：3,449 KB
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• 刊物主题：Zoology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1810-522X

文摘

Background Nemerteans of the genus Malacobdella live inside of the mantle cavity of marine bivalves. The genus currently contains only six species, five of which are host-specific and usually found in a single host species, while the sixth species, M. grossa, has a wide host range and has been found in 27 different bivalve species to date. The main challenge of Malacobdella species identification resides in the similarity of the external morphology between species (terminal sucker, gut undulations number, anus position and gonad colouration), and thus, the illustrations provided in the original descriptions do not allow reliable identification. In this article, we analyse the relationships among three species of Malacobdella: M. arrokeana, M. japonica and M. grossa, adding new data for the M. grossa and reporting the first for M. japonica, analysing 658 base pairs of the mitochondrial cytochrome c oxidase subunit I gene (COI). Based on these analyses, we present and discuss the potential of DNA barcoding for Malacobdella species identification. Results Sixty-four DNA barcoding fragments of the mitochondrial COI gene from three different Malacobdella species (M. arrokeana, M. japonica and M. grossa) are analysed (24 of them newly sequenced for this study, along with four outgroup specimens) and used to delineate species. Divergences, measured as uncorrected differences, between the three species were M. arrokeana-M. grossa 11.73%, M. arrokeana-M. japonica 10.62% and M. grossa-M. japonica 10.97%. The mean intraspecific divergence within the ingroup species showed a patent gap with respect to the interspecific ones: 0.18% for M. arrokeana, 0.13% for M. grossa and 0.02% for M. japonica (ranges from 0 to 0.91%). Conclusions We conclude that there is a clear correspondence between the molecular data and distinguishing morphological characters. Our results thus indicate that some morphological characters are useful for species identification and support the potential of DNA barcoding for species identification in a taxonomic group with subtle morphological external differences.