Pennellid copepod Peniculus fistula fistula(Nordmann, 1832)(Synonym: Peniculus fistula Nordmann, 1832,Aphia ID: 745880), a worldwide distributed species, has been recovered from at least 19 teleost families. The prese...Pennellid copepod Peniculus fistula fistula(Nordmann, 1832)(Synonym: Peniculus fistula Nordmann, 1832,Aphia ID: 745880), a worldwide distributed species, has been recovered from at least 19 teleost families. The present paper reports for the first time from the Malabar coast(South India), not only the existence of a new host family, Clupeidae, hosting this parasitic copepod species(P. fistula fistula) but also their season dependent hosting. A total of 123 marine fish species, belonging to 77 genera and 38 families surveyed along the Malabar coast, only the clupeid, Anadontostoma chacunda(Hamilton, 1822) was shown to be infected by this copepod species;all the recovered(copepod) parasites were invariably found attached at the mid portion of the caudal fin lobes and lying parallel to the host body, indicating the strict site-specific parasitisation. There is a discrete seasonality in the prevalence(P<0.05) as the sign of infection was noticed during the period from September to May with relatively high prevalence during winter months(November–January). During the monsoon months(June–August), the host fish was found completely free from Peniculus infection. Interestingly, all the 229 recovered specimens(P. fistula fistula) were gravid females having paired uniserrate egg sacs with the length more than its own body length.展开更多
A new species of Proteocephalus from the fish Sinocyclocheilus grahami tingi, a subspecies endemic to Fuxian Lake in Southwest China, is described.This is the first report of cestode from this host. The new species di...A new species of Proteocephalus from the fish Sinocyclocheilus grahami tingi, a subspecies endemic to Fuxian Lake in Southwest China, is described.This is the first report of cestode from this host. The new species differs from P. exiguus, P Longicollis, P parasiluri and P. torulosus,the only other species of Proteocephalus currently reported from China, by lacking an apical sucker from P. exiguus by having 45- 108 rather than 24-54 testes per proglottis, and a maximum of 15 rather than 28 uterine diverticula,from P. longicollis by having an average of 45- 108 rather than 75-115 testes per proglottis and testes being in a single layer instead of 2 layers; and from P. torulosus by having 45-108 instead of 150 testes per proglottis and testes being in 3-4 layers; and from P. parasiluri by having 45-108 rather than 180 testes per proglottis. It resernbles P. percae,P. pollanicola, and P. thymalli in number of testes and uterine diverticula, but differs by lacking an apical sucker. Proteocephalus thymalli, like the new species, has a vagina that opens dorsally to the cirrus sac, but P thymalli slao has postovarian testes,which the new species lacks. The possible significance of parasitological examinations of the other two subspecies of S.grahami in two lakes close to Fuxian Lake is discussed in relation to host speciation and coevolution of the host-parasite system.展开更多
基金The Kerala State Council for Science,Technology and Environment,Government of Kerala under contract No.(T)093/SRS/2011/CSTE,dated 25.06.2011the Department of Science and Technology,Government of India DST-SERB under contract No.EMR/2016/001163 dated 28.08.2017
文摘Pennellid copepod Peniculus fistula fistula(Nordmann, 1832)(Synonym: Peniculus fistula Nordmann, 1832,Aphia ID: 745880), a worldwide distributed species, has been recovered from at least 19 teleost families. The present paper reports for the first time from the Malabar coast(South India), not only the existence of a new host family, Clupeidae, hosting this parasitic copepod species(P. fistula fistula) but also their season dependent hosting. A total of 123 marine fish species, belonging to 77 genera and 38 families surveyed along the Malabar coast, only the clupeid, Anadontostoma chacunda(Hamilton, 1822) was shown to be infected by this copepod species;all the recovered(copepod) parasites were invariably found attached at the mid portion of the caudal fin lobes and lying parallel to the host body, indicating the strict site-specific parasitisation. There is a discrete seasonality in the prevalence(P<0.05) as the sign of infection was noticed during the period from September to May with relatively high prevalence during winter months(November–January). During the monsoon months(June–August), the host fish was found completely free from Peniculus infection. Interestingly, all the 229 recovered specimens(P. fistula fistula) were gravid females having paired uniserrate egg sacs with the length more than its own body length.
文摘A new species of Proteocephalus from the fish Sinocyclocheilus grahami tingi, a subspecies endemic to Fuxian Lake in Southwest China, is described.This is the first report of cestode from this host. The new species differs from P. exiguus, P Longicollis, P parasiluri and P. torulosus,the only other species of Proteocephalus currently reported from China, by lacking an apical sucker from P. exiguus by having 45- 108 rather than 24-54 testes per proglottis, and a maximum of 15 rather than 28 uterine diverticula,from P. longicollis by having an average of 45- 108 rather than 75-115 testes per proglottis and testes being in a single layer instead of 2 layers; and from P. torulosus by having 45-108 instead of 150 testes per proglottis and testes being in 3-4 layers; and from P. parasiluri by having 45-108 rather than 180 testes per proglottis. It resernbles P. percae,P. pollanicola, and P. thymalli in number of testes and uterine diverticula, but differs by lacking an apical sucker. Proteocephalus thymalli, like the new species, has a vagina that opens dorsally to the cirrus sac, but P thymalli slao has postovarian testes,which the new species lacks. The possible significance of parasitological examinations of the other two subspecies of S.grahami in two lakes close to Fuxian Lake is discussed in relation to host speciation and coevolution of the host-parasite system.
