Stereoscan observations of the miracidium and early sporocyst ofSchistosoma mansoni

  title={Stereoscan observations of the miracidium and early sporocyst ofSchistosoma mansoni},
  author={M. K{\o}ie and F. Frandsen},
  journal={Zeitschrift f{\"u}r Parasitenkunde},
SummaryWhole miracidia ofSchistosoma mansoni, miracidia vibrated in an ultrasonic cleaner, and the miracidium-sporocyst transition were studied in the steroscan electron microscope.After vibrating, the cilia broke off near the bases and the epidermal cella, intercellular ridge and sensory structures were revealed. The apical papilla had a folded surface with penetrating sensory cilia. The number of epidermal cells varied between 17 and 22.The lateral papillae appeared as bulbous projections on… Expand
Stereoscan studies of eggs, free-swimming and penetrating miracidia and early sporocysts of Fasciola hepatica
The egg of Fasciola hepatica has a smooth surface with a slightly elevated circle marking the fracture of the operculum, and after a few days the tegument of the sporocyst is provided with microvillus-like projections and the apical papilla and sensory structures are lost. Expand
Scanning electron microscope observations on miracidium, cercaria, and cercarial papillar patterns of Schistosoma japonicum.
The surfaces of Schistosoma japonicum miracidia and cercariae were examined with the scanning electron microscope and argentophilic papillae were examined, presumed to be sensory, with the light microscope. Expand
Ultrastructural changes in the body wall ofSchistosoma mansoni during the transformation of the miracidium into the mother sporocyst in the snail hostBiomphalaria pfeifferi
SummaryThe ultrastructure of the body wall of the free miracidium ofSchistosoma mansoni and the changes occurring within 48h after penetration into the intermediate hostBiomphalaria pfeifferi areExpand
Studies on the biology of Schistosoma margrebowiei.
The results indicate that the size of snails at the time of exposure is an important factor in successful infection and the potential for immunizing mice with the hepatopancreas from infected and uninfected snails against schistosomiasis has been evaluated. Expand
Chaetotaxy and surface structures of the miracidia of Ichthyocotylurus erraticus (Rudolphi, 1809), I. variegatus (Creplin, 1825) and Apatemon gracilis (Szidat, 1928) (Digenea, Strigeidae)
Silver nitrate staining was used to investigate the number and arrangement of argentophillic structures (epidermal plates, sensilla, excretory pores) of three species of strigeid miracidia of Ichthyocotylurus erraticus, confirming the position and revealing the form of body sensilla. Expand
Glycotope analysis in miracidia and primary sporocysts of Schistosoma mansoni: differential expression during the miracidium-to-sporocyst transformation.
Investigation of the developmental expression of glycotopes in miracidia and primary sporocysts of Schistosoma mansoni suggests an evolutionary convergence of carbohydrate expression between schistosomes and their snail host. Expand
Lectin and human blood group determinants of Schistosoma mansoni: alteration following in vitro transformation of miracidium to mother sporocyst.
It is concluded that transition of the miracidium to the sporocyst results in the alteration of surface molecular structures on schistosome larve, and determinants for Con A and anti-ADb remained essentially unaltered. Expand


Observations on the epidermis of the miracidium and on the formation of the tegument of the sporocyst of Fasciola hepatica.
The relationship between the ciliated epidermal cells and the subepidermal layer of the miracidium of Fasciola hepatica has been described and it is suggested that pinocytosis may play a role in food absorption. Expand
On the histochemistry and ultrastructure of the daughter sporocyst of Cercaria buccini Lebour, 1911
Abstract The body wall of the daughter sporocyst of Cercaria buccini has been examined by means of the light microscope, scanning and transmission electron microscopes, and the effect on the host,Expand
The miracidium-sporocyst transition in Schistosoma mansoni: surface changes in vitro with ultrastructural correlation.
Induction of the same changes in vitro, with viability of sporocysts demonstrated by subsequent normal development upon implantation into snails, offers a means whereby these phenomena may be readily observed. Expand
Schistosoma mansoni: penetration apparatus and epidermis of the miracidium.
The penetration apparatus was composed of 3 unicellular glands which contain membrane-bound vesicles containing macromolecular diglycols and the surface of the miracidium, with the exception of the apical papilla, was covered with ciliated epidermal cells containing numerous mitochondria, membranous bodies, and glycogen. Expand
Scanning electron microscope observations on the miracidium of Schistosoma.
  • P. LoVerde
  • Biology, Medicine
  • International journal for parasitology
  • 1975
Miracidia of two species of Schistosoma were studied with the scanning electron microscope to more clearly visualize what is seen with the light microscope and the transmission electron microscope and to relate the structure of the apical papilla to its function in snail penetration. Expand
On the Occurrence and Structure of Choanocyte-like Cells in Some Echinoderms
The present report together with previously published data lend support to the idea, that the choanocyte is a fundamental cell type in metazoans, probably derived phylogenetically from some flagellate ancestor. Expand
Life history of Heterobilharzia americana Price 1929, a schistosome of the raccoon and other mammals in southeastern United States.
  • H. Lee
  • Biology, Medicine
  • The Journal of parasitology
  • 1962
The life cycle of Heterobilharzia americana, a bloodfluke of the raccoon, nutria, dog, and rabbit in southern Louisiana, was completed in the laboratory. The cercariae were found in naturallyExpand
Ultrastructure of the Tegument of Schistosoma
The epithelium and associated structures of the miracidium are considered and the contrasting teguments of the daughter sporocyst, which has the syncytial tegument and nucleated subtegumental cells of the typical digenetic trematode, are considered. Expand
Ultrastructural, histochemical and cytochemical observations on the body wall of the daughter sporocyst of Cercaria helvetica XII (Dubois 1927)
SummaryThe body wall of the daughter sporocyst of Cercaria helvetica XII can be seen to be divided into three main regions: an outer tegument resting on a basal lamina, the body wall musculatureExpand
The ultrastructure, based on stereoscan observations, of the oral sucker of the cercaria of Schistosoma mansoni with special reference to penetration
The ultrastructure of the oral sucker of the cercaria of Schistosoma mansoni was investigated using stereoscan and transmission electron microscopy to find a series of sensory structures, in close proximity to the duct openings, that enable the cerbaria to test the host surface which results in the selection and penetration of a suitable site. Expand