Further observations on Artyfechinostomum mehrai (Faruqui) (Echinostomatidae: Trematoda)

G. P. Jain

doi:10.1017/s0031182000025142

Further observations on Artyfechinostomum mehrai (Faruqui) (Echinostomatidae: Trematoda)

Parasitology ◽

10.1017/s0031182000025142 ◽

1960 ◽

Vol 50 (1-2) ◽

pp. 7-11 ◽

Cited By ~ 3

Author(s):

G. P. Jain

Keyword(s):

Life Cycle ◽

Valid Genus ◽

White Rats

While working on the life cycle of Cercaria mehrai Faruqui, 1930, the author obtained the adults from the intestine of experimentally infected white rats. The trematodes thus obtained were reported as belonging to the genus Paryphostomum Dietz, 1909. In view of the facts that the collar spines are 43 in number, the vitellaria are confluent in the post-testicular region and the cirrus-sac extends far behind the acetabulum, P. mehrai is transferred to the genus Artyfechinostomum Lane, 1915, which is, in author's opinion, a valid genus (Jain, 1959).

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On the life history ofHepatojarakus malayae(Nematoda: Trichostrongylidae), a parasite of the feral rat in Malaysia

Journal of Helminthology ◽

10.1017/s0022149x00022987 ◽

1974 ◽

Vol 48 (4) ◽

pp. 293-310 ◽

Cited By ~ 3

Author(s):

C. K. Ow-Yang

Keyword(s):

Young Adults ◽

Life History ◽

Life Cycle ◽

Bile Duct ◽

Peninsular Malaysia ◽

The Third ◽

White Rats ◽

Third Stage ◽

Morula Stage ◽

Migratory Route

AbstractAdults ofHepatojarakus malayaelive in the bile duct of many species ofRattusin Peninsular Malaysia, ine life cycle of this parasite was studied in laboratory white rats. Eggs were passed out with the faeces at the early morula stage and hatched within 15 hours, giving rise to the first stage larvae. These developed to the third stage in about 36 hours and these were given orally to new rats in experimental infections. The migratory route of the larvae from the gut to the liver was traced. Penetration into the host appeared to be confined mainly to the fundic wall of the stomach. The larvae presumably followed the portal route to the uver. Here the final moult occurred before the young adults moved into the biliary passages.

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The life cycle of MetaCutereba apicalis (Diptera: Cuterebidae)

Memórias do Instituto Oswaldo Cruz ◽

10.1590/s0074-02761988000400016 ◽

1988 ◽

Vol 83 (4) ◽

pp. 485-491 ◽

Cited By ~ 3

Author(s):

Antonio Cesar Rios Leite ◽

Paul Williams

Keyword(s):

Life Cycle ◽

Incubation Period ◽

Natural Host ◽

Larval Phase ◽

Laboratory Conditions ◽

White Rats

The development of Metacuterebra apicalis in laboratory conditions is described. The natural host, Oryzomys subflavus, and laboratory white rats were used as experimental hosts. The life cycle, from oviposition to the deaths of adults, was completed in about 73 days. The incubation period of eggs was about 10 days; the parasitic larval phase lasted 23 days in the natural host and 26 days in white rats; pupa lived for 32 days and adults survived for six days.

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On the egg and miracidium of Paryphostomum mehrai (Faruqui)

Parasitology ◽

10.1017/s0031182000021089 ◽

1958 ◽

Vol 48 (1-2) ◽

pp. 96-100

Author(s):

G. P. Jain

Keyword(s):

Life Cycle ◽

Snail Host ◽

Liver Mass ◽

Entire Process ◽

White Rats ◽

Large Numbers ◽

Gradual Development ◽

Indoplanorbis Exustus ◽

Further Development

This paper gives an account of the mature eggs and the miracidium of Paryphostomum mehrai obtained from experimentally infected white rats, which were fed with the cysts of Cercaria mehrai obtained from naturally infected as well as artificially infected snails of the species Indoplanorbis exustus. The metacercariae develop into the adults in the intestine of the host in a period of 20 days, after which the adults begin to lay their eggs, which are passed out with the faeces of the host. The molluscan phase of the life cycle involves the gradual development of the miracidium larva after its penetration into the molluscan host into a mother rediae. The mother rediae, not more than three to five in number, were observed in the preoesophageal region of the snail host. They produce large numbers of daughter rediae, which were found migrating towards the liver mass. The daughter rediae, after fixing themselves in the liver mass, undergo further development and produce large numbers of cercariae. The entire process, from the entry of the miracidium until the cercariae are matured takes about 8 weeks.

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Ultrastructural analysis of “Sensory” surface nerve endings and “putative” neurotransmitter sites in Schistosoma mansoni Miracidia

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100156791 ◽

1989 ◽

Vol 47 ◽

pp. 962-963

Author(s):

Betty Ruth Jones ◽

Steve Chi-Tang Pan

Keyword(s):

Nervous System ◽

Life Cycle ◽

Schistosoma Mansoni ◽

Snail Host ◽

Complex Life Cycle ◽

Rational Approach ◽

Effective Control ◽

The Social ◽

Social And Economic Development ◽

Basic Biology

INTRODUCTION: Schistosomiasis has been described as “one of the most devastating diseases of mankind, second only to malaria in its deleterious effects on the social and economic development of populations in many warm areas of the world.” The disease is worldwide and is probably spreading faster and becoming more intense than the overall research efforts designed to provide the basis for countering it. Moreover, there are indications that the development of water resources and the demands for increasing cultivation and food in developing countries may prevent adequate control of the disease and thus the number of infections are increasing.Our knowledge of the basic biology of the parasites causing the disease is far from adequate. Such knowledge is essential if we are to develop a rational approach to the effective control of human schistosomiasis. The miracidium is the first infective stage in the complex life cycle of schistosomes. The future of the entire life cycle depends on the capacity and ability of this organism to locate and enter a suitable snail host for further development, Little is known about the nervous system of the miracidium of Schistosoma mansoni and of other trematodes. Studies indicate that miracidia contain a well developed and complex nervous system that may aid the larvae in locating and entering a susceptible snail host (Wilson, 1970; Brooker, 1972; Chernin, 1974; Pan, 1980; Mehlhorn, 1988; and Jones, 1987-1988).

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A freeze-fracture-etched study of the physarum polycephalum plasma membrane during early formation of the macroplasmodial stage

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100147570 ◽

1993 ◽

Vol 51 ◽

pp. 346-347

Author(s):

Randolph W. Taylor ◽

Henrie Treadwell

Keyword(s):

Plasma Membrane ◽

Life Cycle ◽

Growth Phase ◽

Filter Paper ◽

Physarum Polycephalum ◽

Freeze Fracture ◽

Petri Dish ◽

Wire Screen ◽

Wide Mouth ◽

Sterile Filter

The plasma membrane of the Slime Mold, Physarum polycephalum, process unique morphological distinctions at different stages of the life cycle. Investigations of the plasma membrane of P. polycephalum, particularly, the arrangements of the intramembranous particles has provided useful information concerning possible changes occurring in higher organisms. In this report Freeze-fracture-etched techniques were used to investigate 3 hours post-fusion of the macroplasmodia stage of the P. polycephalum plasma membrane.Microplasmodia of Physarum polycephalum (M3C), axenically maintained, were collected in mid-expotential growth phase by centrifugation. Aliquots of microplasmodia were spread in 3 cm circles with a wide mouth pipette onto sterile filter paper which was supported on a wire screen contained in a petri dish. The cells were starved for 2 hrs at 24°C. After starvation, the cells were feed semidefined medium supplemented with hemin and incubated at 24°C. Three hours after incubation, samples were collected randomly from the petri plates, placed in plancettes and frozen with a propane-nitrogen jet freezer.

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