Comparison of external morphological characteristics and movement pat-terns between Schistosoma japonicum and S.sinensis cercariae
Objective To compare the external morphological characteristics and movement patterns between Schistosoma ja-ponicum and S.sinensis cercariae.Methods S.japonicum and S.sinensis cercariae were heat-fixed,and well-extended cercari-ae,of 50 each species,were randomly selected for measurement of body length,body width,tail stem length,and tail fork length.The external morphological characteristics of S.japonicum and S.sinensis cercariae were compared.In addition,S.japonicum-in-fected Oncomelania snails and S.sinensis-infected Tricula snails were observed under a microscope and the movement patterns of S.japonicum and S.sinensis cercariae were compared.Results The mean body length,body width,tail stem length,and tail fork length were(0.16±0.01),(0.05±0.01),(0.14±0.01)mm and(0.06±0.01)mm for S.japonicum cercariae,and(0.13±0.01),(0.05±0.01),(0.13±0.01)mm and(0.06±0.01)mm for S.sinensis cercariae,respectively,and there were significant dif-ferences in terms of cercaria body length(t=14.583,P<0.05)and tail stem length(t=3.861,P<0.05),while no significant dif-ferences were seen in terms of body width(t=0.896,P>0.05)or tail fork length(t=-0.454,P>0.05).Microscopy revealed that the tails of both S.japonicum and S.sinensis cercariae swung from side to side and there was no significant difference in their movement pattern.Conclusion S.sinensis and S.japonicum cercariae share highly similar external external morphological characteristics and movement patterns.
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