Journal of Environmental Biology

Redescription of Rhabdochona baylisi Rai, 1969 from a cat fish, Eutropiichthys vacha from Jiri River, Jiribam, Manipur, India 

C.D. Devi, R.K.S. Singh* and R.K. Gambhir 

Parasitology Section, Centre of Advanced Studies in Life Sciences, Manipur University, Imphal-795 003, India

*Corresponding Author Email : chrkjiri@gmail.com

Paper received: 10.12.2019 ?????? ???????????????????????????????????????Revised received: 27.6.2020 ?? ??????????????????????????????????????????Accepted: 10.07.2020

Abstract

Aim: To investigate and record a taxonomic account on parasite fauna of freshwater fishes from Jiri River, Jiribam, Manipur (India).

Methodology: During the taxonomic study carried out in January-April 2019, the fishes were collected, anaesthetised, and examined for the presence of parasites. Recovered parasites (two gravid female and four adult male and one juvenile nematode species) from the intestine of Eutropiichthys vacha were washed, fixed, and dehydrated in Glycerine Alcohol. The permanent slide specimens were examined under a light binocular microscope.            

Results: Based on the study, the recovered nematode was identified as Rhabdochona baylisi Rai, 1969 of the genus Rhabdochona Railliet, 1916.     

The identified species possessed 8 prostomal teeth, U-loop shape vagina, smooth eggs, and tail with a rounded tip in both sexes. Thus, it can be assigned to the subgenus Globochona Moravec, 1972a. Moreover, it resembles with their conspecies R. mazeedi, R. garuai, R. bosei and R. baylisi, in general morphology. Comparing the relative characteristics with their conspecies, the present species has closely resembled Rhabdochona baylisi Rai, 1969 but differs in a few aspects such as the spicule length ratio (1:3.3 vs. 1:5.5), shorter with blunt tip left spicule in present species whereas more longer with bifurcated distal tip in R. baylisi, the number and arrangement of caudal papillae (13+0+5 vs.12+0+4), The present species posses 8 prostomal teeth whereas teeth are not reported in R. baylisi. Inspite of some intraspecific variations the identified specimen shows major resemblance with the R. baylisi, thus it was assigned to Rhabdochona? baylisi Rai, 1969 as a new redescription record from Jiri River, Jiribam, Manipur (India).   

Key words: Eutropiichthys vacha, Jiri River, Manipur, Nematode, Rhabdochona

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