Morphological and phylogenetical analysis reveals that a new tapeworm species (Cestoda: Hymenolepididae) from whooper swan belongs to Cloacotaenia not Hymenolepis  

作　　者：Zhijun Hou Lei Han Ying Sun Dongdong Shen Zhiwei Peng Lixin Wang Qian Zhai Yanqiang Zhou Yaxian Lu Liwei Teng Hongliang Chai 

机构地区：[1]College of Wildlife Resource,Northeast Forestry University,Harbin 150040,People’s Republic of China

出　　处：《Journal of Forestry Research》2020年第6期2581-2587,共7页林业研究（英文版）

基　　金：Thanks are especially due to Professor David Blair of the School of Marine and Tropical Biology,James Cook University,Professor Jean Mariaux,Natural History Museum in Geneva,Switzerland,and reviewers for assistance with the morphological description and language editing.

摘　　要：During a helminthological study of waterfowl in China,a new species(Cloacotaenia cygnimorbus sp.nov.)of hymenolepidid cestodes(tapeworm)was found in the small intestine of whooper swan(Cygnus cygnus,Linnaeus,1758).The rudimentary rostellum and four unarmed muscular suckers,proglottids with distinct craspedote and three spherical testes were coincident with the characters of Cloacotaenia or Hymenolepis,but phylogenetic analysis of 28S rRNA and cox1 gene revealed that the new species is Cloacotaenia rather than Hymenolepis.Its morphology was also clearly diff erentiated from C.megalops in the arrangement of its testes in a triangle instead of in line and the cirrus unarmed rather than spined.Compared with C.megalops,the new species has more elongated neck,much larger mature proglottids and much smaller testes,cirrus sac,ovary,vitellarium and uterine proglottid.In addition,it infected the host intestine not the cloacae.Phylogenetic analysis of cox1 gene of the new species shows that it had a level of sequence variation(10.52–23.06%)with the sequences of C.megalops.The considerable morphological and molecular diff erences between those two parasites support C.cygnimorbus sp.nov.as a new species.

关 键 词：Cloacotaenia Hymenolepididae HYMENOLEPIS Whooper swan 28S rRNA cox1 

分 类 号：Q959[生物学—动物学]