Objective: To study the development of Physocephalus dromedarii(P. dromedarii) in the final host.Methods: For this, 5 adult dromedaries were orally infected with third larval stages of P. dromedarii obtained from natu...Objective: To study the development of Physocephalus dromedarii(P. dromedarii) in the final host.Methods: For this, 5 adult dromedaries were orally infected with third larval stages of P. dromedarii obtained from naturally infected scarab beetles(Scarabaeus cristatus). The camels were necropsied 14, 42, 70, 84 and 280 days after infection and their abomasi were examined for the presence of nematodes.Results: Early 4th stage larva occurred already 2 weeks after infection. They were still in the sheet of the 3rd stage larva. Six weeks after infection, the nematodes became juvenile male and female adults measuring 9 and 10 mm, respectively. Their size doubled at 10 weeks post infection and patency was reached at 12 weeks. P. dromedarii was still present in the camel that was examined 40 weeks after infection.Conclusions: As a result of experimental infection of the natural host, the determined prepatent period of P. dromedarii equalled 12 weeks.展开更多
Nematoda is a metazoan group with extremely high diversity only next to Insecta. Caenorhabditis elegans is now a favorable experimental model animal in modern de-velopmental biology, genetics and genomics studies. How...Nematoda is a metazoan group with extremely high diversity only next to Insecta. Caenorhabditis elegans is now a favorable experimental model animal in modern de-velopmental biology, genetics and genomics studies. However, the phylogeny of Nematoda and the phylogenetic position of the phylum within animal kingdom have long been in debate. Recent molecular phylogenetic studies gave great challenges to the traditional nematode classification. The new phylog-enies not only placed the Nematoda in the Ecdysozoan and divided the phylum into five clades, but also provided new insights into animal molecular identification and phyloge-netic biodiversity studies. The present paper reviews major progress and remaining problems in the current molecular phylogenetic studies of Nematoda, and prospects the devel-opmental tendencies of this field.展开更多
A new species,Physaloptera apodemi sp.nov.,was collected from Apodemus sylvaticus(Linnaeus,1758)(Rodentia:Muridae)from the National Baxianshan Nature Reserve,Tianjin,China.The new species differs from the congeners by...A new species,Physaloptera apodemi sp.nov.,was collected from Apodemus sylvaticus(Linnaeus,1758)(Rodentia:Muridae)from the National Baxianshan Nature Reserve,Tianjin,China.The new species differs from the congeners by having 22 caudal papillae,the number and arrangement of caudal papillae,either the left or the right spicule with striated sheaths at their proximal end,the vulva located in the anterior fifth of body,and the egg size.A key to the species of Physaloptera from rodents is also given.展开更多
文摘Objective: To study the development of Physocephalus dromedarii(P. dromedarii) in the final host.Methods: For this, 5 adult dromedaries were orally infected with third larval stages of P. dromedarii obtained from naturally infected scarab beetles(Scarabaeus cristatus). The camels were necropsied 14, 42, 70, 84 and 280 days after infection and their abomasi were examined for the presence of nematodes.Results: Early 4th stage larva occurred already 2 weeks after infection. They were still in the sheet of the 3rd stage larva. Six weeks after infection, the nematodes became juvenile male and female adults measuring 9 and 10 mm, respectively. Their size doubled at 10 weeks post infection and patency was reached at 12 weeks. P. dromedarii was still present in the camel that was examined 40 weeks after infection.Conclusions: As a result of experimental infection of the natural host, the determined prepatent period of P. dromedarii equalled 12 weeks.
基金This work was supported by the National Natural Science Foundation of China (Grant No. 30000020) the doctoral Foundation of Shanghai.
文摘Nematoda is a metazoan group with extremely high diversity only next to Insecta. Caenorhabditis elegans is now a favorable experimental model animal in modern de-velopmental biology, genetics and genomics studies. However, the phylogeny of Nematoda and the phylogenetic position of the phylum within animal kingdom have long been in debate. Recent molecular phylogenetic studies gave great challenges to the traditional nematode classification. The new phylog-enies not only placed the Nematoda in the Ecdysozoan and divided the phylum into five clades, but also provided new insights into animal molecular identification and phyloge-netic biodiversity studies. The present paper reviews major progress and remaining problems in the current molecular phylogenetic studies of Nematoda, and prospects the devel-opmental tendencies of this field.
基金supported by the National Natural Science Foundation of China(31272269)。
文摘A new species,Physaloptera apodemi sp.nov.,was collected from Apodemus sylvaticus(Linnaeus,1758)(Rodentia:Muridae)from the National Baxianshan Nature Reserve,Tianjin,China.The new species differs from the congeners by having 22 caudal papillae,the number and arrangement of caudal papillae,either the left or the right spicule with striated sheaths at their proximal end,the vulva located in the anterior fifth of body,and the egg size.A key to the species of Physaloptera from rodents is also given.
