Abstract
Three new species of virgulate xiphidiocercariae infecting the freshwater snails of Malabar, Kerala is described. Cercaria sp. XXVI Malabar n. sp. recovered from Bellamya bengalensis collected from Malappuram district of Kerala is characterized by an elongate-oval, spinose body and a highly contractile and spinose tail; dagger-shaped stylet with reinforced walls; coma-shaped virgula organ; muscular pharynx; short, narrow oesophagus; three pairs of penetration glands; bean-shaped excretory bladder and 12 pairs of flame cells. Cercaria sp. XXVII Malabar n. sp. recovered from Thiara tuberculata collected from Wayanad district of Kerala has a round to elongate-oval, spinose body; a highly contractile, spinose tail; dagger-shaped stylet; muscular pharynx; short oesophagus; narrow caeca extending up to ventral sucker; three pairs of penetration glands; bicornuate, thin-walled excretory bladder, and 12 pairs of flame cells. Cercaria sp. XXVII Malabar n. sp. infecting Paracrostoma huegelii also collected from Wayanad district, Kerala is characterized by elongate-oval, spinose body; contractile and spinose tail; dagger-shaped, inwardly curved stylet; virgula organ with elongated lobes; globular pharynx; three pairs of penetration glands; bicornuate, transversely elongate excretory bladder and 18 pairs of flame cells. All the three cercariae developed in sporocysts within the heapatopancreatic tissues of their respective snail hosts. The cercariae were compared with related species to establish their systematic position.
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References
Hall JE, Groves AE (1963) Virgulate xiphidiocercariae from Nitocris dilatatus Conrad. J Parasitol 49(2):249–263
Ismail NS, Abdel-Hafez SK (1983) Larval stages of digenetic trematodes of Melanopsis praemorsa (L. 1758, Buccinum) (Thiaridae) snails from Yarmouk River, Jordan. Z Parasitenkd 69:613–626. https://doi.org/10.1007/BF00926672
Ito J (1977) Studies on the freshwater cercariae in Leyte Island, Philippines 3. Cercariae from Thiaridae. Jpn J Exp Med 47(4):223–248
Murty AS (1976) Studies on Indian cercariae III. Virgulate Plagiorchioid cercariae. Proc Indian Acad Sci 83(1):12–17
Nasir P, Diaz MT (1973) Freshwater larval trematodes XXXII. Twenty new species of Venezuelan cercariae. Riv Parassitol 34(1):1–44
Ramachandrula A, Agarwal SM (1985) Studies on xiphidiocercous cercariae at Raipur and comments on the classification of xiphidiocercariae. Indian J Helminthol 37:36–48
Sanil NK, Janardanan KP (2019) Four new species of virgulate xiphidiocercariae infecting the freshwater snail, Bithynia (Digoniostoma) pulchella (Benson, 1836) in Malabar. J Parasit Dis, Kerala. https://doi.org/10.1007/s12639-019-01100-y
Sewell RBS (1922) Cercariae indicae. Indian J Med Res 10:1–370
Sheena P, Manjula KT, Subair KT, Janardanan KP (2007) The life-cycle of Mesostephanus indicum Mehra, 1947 (Digenea: Cyathocotylidae). Parasitol Res 101:1015–1018
Acknowledgements
The authors thank the Head, Department of Zoology, University of Calicut for providing necessary facilities. One of the authors (NKS) is grateful to the Council of Scientific and Industrial Research (CSIR) for financial support in the form of a Senior Research Fellowship.
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The study was designed and guided by Dr. KPJ and Dr. NKS carried out the survey, collected and studied the cercariae in detail. The manuscript was written by both the authors.
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Sanil, N.K., Janardanan, K.P. Three new species of virgulate xiphidiocercariae infecting the freshwater snails of Kerala. J Parasit Dis 44, 772–780 (2020). https://doi.org/10.1007/s12639-020-01240-6
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DOI: https://doi.org/10.1007/s12639-020-01240-6