Morphological and phylogenetical analysis reveals that a new tapeworm species (Cestoda: Hymenolepididae) from whooper sw
- PDF / 1,510,534 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 48 Downloads / 197 Views
ORIGINAL PAPER
Morphological and phylogenetical analysis reveals that a new tapeworm species (Cestoda: Hymenolepididae) from whooper swan belongs to Cloacotaenia not Hymenolepis Zhijun Hou1 · Lei Han1 · Ying Sun1 · Dongdong Shen1 · Zhiwei Peng1 · Lixin Wang1 · Qian Zhai1 · Yanqiang Zhou1 · Yaxian Lu1 · Liwei Teng1 · Hongliang Chai1
Received: 14 March 2019 / Accepted: 15 May 2019 © Northeast Forestry University 2019
Abstract 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 differentiated 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 Zhijun Hou, Lei Han, Ying Sun and Dongdong Shen have contributed equally to this work. Project funding: This study was supported by National Natural Science Foundation of China (Grant Nos. 31601873 and 31970501), Fundamental Research Funds for the Central Universities (No. 2572018BE07), and Surveillance of Wildlife Diseases from the State Forestry Administration of China. The online version is available at http://www.springerlink.com Corresponding editor: Yanbo Hu. * Zhijun Hou [email protected] Liwei Teng [email protected] Hongliang Chai [email protected] 1
College of Wildlife Resource, Northeast Forestry University, Harbin 150040, People’s Republic of China
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 differences between those two parasites support C. cygnimorbus sp. nov. as a new species. Keywords Cloacotaenia · Hymenolepididae · Hymenolepis · Whooper swan · 28S rRNA · cox1
Introduction Cestodes (tapeworms) of the family Hymenolepididae Ariola, 1899 have a cosmopolitan distribution and parasitize a broad range of mammalian and avian hosts, such as rodents, bats, and waterfowl (Czaplinski and Vaucher 1994). The latest comprehensive systematic revision of Hymenolepididae was undertaken by Czaplinski and Vaucher (1994); however, they did not systematically revise every genus in the family. The genus of Hymenolepis in bird is characterized by the presence of three testes, unarmed suckers, proglottids with visibly craspedote, and absent or rudimentary rostellum, without hooks (Czaplinski and Vaucher
Data Loading...
