Advertisement

A parapleurolophocercous cercaria and a furcocercous cercaria from the freshwater gastropods of the Western Ghats

  • K. Arusha
  • P. K. PrasadanEmail author
Original Article
  • 4 Downloads

Abstract

Two cercariae were recorded from freshwater snails, one each from Digoniostoma pulchella and Indoplanorbis exustus and named Cercaria sp. III Western Ghats n.sp. and Cercaria sp. IV Western Ghats n.sp. respectively. Cercaria sp. III Western Ghats n.sp. is distome, ocellate and pharyngeate with peculiar spines on the tail, belongs to the Parapleurolophocerca group. This cercaria has 10 pairs of penetration glands in two groups; thick walled large excretory bladder and 10 pairs of flame cells including a pair arising from the caudal excretory canal. Cercaria sp. III Western Ghats n.sp develops inside the sausage shaped redia. Developed cercariae were found outside the rediae, in the host tissue. The furcocercous cercaria, Cercaria sp. IV Western Ghats n.sp is elongate, non ocellate, pharyngeate and longifurcocercous with three crowns of spines beside mouth, three pairs of penetration glands, small excretory bladder and twenty-two flame cells including four flame cells in the tail stem. Asexual multiplication of the organism occurs inside the sporocyst in the hepatopancreas of I. exustus. The present paper reports two new cercariae with their intra-molluscan stages recovered from the snails of the Wayanad region of the Western Ghats, and their morphological and morphometric comparison with the related species to determine their systematic positions.

Keywords

Cercaria Furcocercous Western Ghats Wayanad Digoniostoma pulchella Indoplanorbis exustus 

Notes

Acknowledgements

The authors are grateful to Kannur University for providing necessary facilities. One of the authors (K Arusha) is grateful to the Council of Scientific and Industrial Research (CSIR) for providing financial support in the form of a Junior Research Fellowship. Dr. Prasadan is thankful to KSCSTE, Govt. of Kerala for providing equipments for the study.

Author’s contribution

Dr. PKP designed and guided the study. Mrs. KA carried out the survey, collected and studied the cercariae in detail. The manuscript was written by both the authors.

Compliance with ethical standards

Conflict of interest

The authors declare that that there is no conflict of interest between them.

Ethical approval

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All procedures performed in the study involving animals were in accordance with the ethical standards of the institution or practice at which the study was conducted.

References

  1. Bedinger CA Jr, Meade TG (1967) Biology of a new cercaria for Posthodiplostomum minimum (Trematoda: Diplostomidae). J Parasitol 53(5):985–988CrossRefGoogle Scholar
  2. Cantwell GE (1981) Methods for invertebrates. In: Clark G (ed) Staining procedures. Williams and Wilkins, Baltimore, pp 255–280Google Scholar
  3. Ditrich O, Na V, Scholz T, Giboda M (1992) Larval stages of medically important flukes (Trematoda) from Vientiane province, Laos. Part II. Cercariae. Ann Parasitol Hum Comp 67(3):75–81CrossRefGoogle Scholar
  4. Donges J (1964) Der Lebenzyklus von Posthodiplostomum cuticola (v. Nordmann, 1832) Dubois, 1936 (Trematoda, Diplostomatidae). Z Parasitenkd 24:169–248Google Scholar
  5. Janardanan KP, Prasadan PK (1991) Studies on the life-cycle of Pleurogenoides ovatus Rao, 1977 (Trematoda: Pleurogenetinae). J Helminthol 65(1):43–50CrossRefGoogle Scholar
  6. Malaki A, Singh KS (1962) Parasitological survey of Kumaun region. Part XVI. Three cercariae from Kamaun. Indian J Helminthol 2:133–153Google Scholar
  7. Mohandas A (1974) Studies on the freshwater Cercariae of Kerala IV. Abnormal growth of the host and intra-sporocyst and intra-redial encystment of the cercariae. Proc Natl Acad Sci India 43(B):273–277Google Scholar
  8. Nishigori M (1924) On a new trematode Stamnosoma formosanum n sp., and its life history. Taiwan Igakkai Zasshi 234:181–228Google Scholar
  9. Onji Y, Nishio T (1924) On the intestinal distomes. Chiba Igakki Zasshi 2:351–399Google Scholar
  10. Ritossa L, Flores V, Viozzi G (2013) Life-cycle stages of a Posthodiplostomum species (Digenea: Diplostomidae) from Patagonia, Argentina. J Parasitol 99(5):777–780CrossRefGoogle Scholar
  11. Sewell RBS (1922) Cercariae indicae. Indian J Med Res 10:1–370Google Scholar

Copyright information

© Indian Society for Parasitology 2019

Authors and Affiliations

  1. 1.Ecological Parasitology and Tropical Biodiversity Laboratory, Department of ZoologyKannur UniversityWayanadIndia

Personalised recommendations