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Molecular phylogenetic identification and morphological characteristics of Raillietina echinobothrida (Cestoda: Cyclophyllidea: Davaineidae) in commercial chickens in North China

  • Genetics, Evolution, and Phylogeny - Original Paper
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Abstract

Raillietina echinobothrida (R. echinobothrida) is one of the most pathogenic and prevalent tapeworms threat to the commercial chickens in China. However, there is a lack of research on their molecular identification and morphological characteristics. This study explored the molecular identification markers for R. echinobothrida in North China based on 18s ribosomal RNA (18s rRNA) gene and the ribosomal DNA second internal transcribed spacer (ITS-2) gene. The BLAST results of 18s rRNA (1643 bp) and ITS-2 (564 bp) gene sequences showed that the isolated intestinal tapeworms were R. echinobothrida. Phylogenetic trees obtained by maximum likelihood (ML) or neighbor-joining (NJ) method revealed that the R. echinobothrida in North China had the closest evolutionary relationship with the species found on the Qinghai-Tibet plateau, China. Morphological observations by hematoxylin staining and scanning electron microscope showed four round suckers and a retractable rostellum on the spherical scolex of R. echinobothrida. Two rows of alternately arranged hooks distributed around the rostellum. There were 30–40 testes in each mature segment. A well-developed cirrus pouch lied outside the excretory duct of mature segment. The gravid segment contained 200–400 eggs and there was a well-developed oncosphere in each egg. In addition, abundant ultrastructural features in mature proglottid of R. echinobothrida in North China were identified by transmission electron microscopy. In conclusion, the present study established ways of molecular phylogenetic identification for R. echinobothrida based on 18s rRNA and ITS-2 gene, and identified the morphological and ultrastructural characteristics of R. echinobothrida in North China.

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Acknowledgements

The study was supported by the Fund Program for the Scientific Activities of Selected Returned Overseas Professionals in Shanxi Province, China Postdoctoral Science Foundation (2020M670694), and Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (No. 2020L0150).

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Correspondence to Nairui Huo.

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Zhang, D., Wu, G., Yang, X. et al. Molecular phylogenetic identification and morphological characteristics of Raillietina echinobothrida (Cestoda: Cyclophyllidea: Davaineidae) in commercial chickens in North China. Parasitol Res 120, 1303–1310 (2021). https://doi.org/10.1007/s00436-021-07081-3

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