The Life History of a New Schistosome, Schistosomatium pathlocopticum Tanabe, Found in Experimentally Infected Mice

Tanabe, Bunshiro

doi:10.2307/3270790

Cited by 19 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Estimates of total number of eggs produced/worm pair/day and number of eggs passed in the -Faust & Meleney (1924); Belding (1965); Kitikoon (1980); S. mekongi - Iijima et al (1971); Kitikoon (1980); S. margrebowiei - Southgate & Knowles (1977); Graber (1978); S. haematobium- Belding (1965); Wright & Bennett (1967a, b); Taylor (1970) thorn et al (1963); Chauhan et al (1973);8. mansoni -Faust et al (1934); ; Belding (1965); 8. rodhaini - Brumpt (1931); Fain et al (1953); Saoud (1966); Fripp (1967); 8. incognitum - Sinha & Srivastava (1956, 1960; Carney et al (19776); 8. douthitti - Tanabe (1923); ; Malek (1977); H. americana - Lee (1962a); Armstrong (1965) 14-5-20-1 20-33-8 13-5-22-5 13-28 17-25 13-34 7-14-8 2-9-5-9 3-3-4-7 4-9-264 6-9-11-7 7-2-16-2 7-2-14 30-10-5 2-6-7-6 4-5-10-2 15-21 et al (1982) excreta/worm pair/day have been included, and both types of estimates were used in the calculation of correlation coefficients. Unless otherwise stated, values appearing in the text or tables for correlations involving rates of egg production were based on total numbers of eggs produced/worm pair/day.…”

Section: I Mammalian Phase Of the Life-cyclementioning

confidence: 99%

A comparative study of the life-histories of mammalian schistosomes

Loker

1983

Parasitology

138

View full text Add to dashboard Cite

Available data in the literature pertaining to the life-history characteristics of all known species of mammalian schistosomes have been gathered, and correlations between such variables as length of pre-patent period, adult worm size, rate of progeny production and progeny size have been explored. Accommodation of the schistosome life-cycle to the constraints imposed by certain host characteristics such as life-expectancy and size is discussed. Of the 23 known species of mammalian schistosomes, 20 species apparently rely to a major extent on relatively large-bodied and long-lived mammals such as primates, ungulates and proboscideans for their transmission. Only 1 species, Schistosomatium douthitti, is exclusively dependent on rodents for its transmission. S. douthitti attains maturity within its definitive host faster than any other mammalian schistosome, and is the only species known to be capable of producing viable eggs by facultative parthenogenesis. For all species of mammalian schistosomes, adult worm size, as estimated by female length, is positively correlated with the number of uterine eggs contained within the female (r = 0.682). For the 7 species for which data exist, rate of egg production/worm pair/day is positively correlated with uterine egg counts (r = 0.873) and inversely correlated with egg length (r = -0.787) and miracidium length (r = -0.953). Length of the pre-patent period is positively correlated with egg length (r = 0.503). With respect to the molluscan host, the number of cercariae produced by snails is positively correlated with the shell size of the snail (r = 0.657). For the 5 species for which data exist, the rate of egg production is inversely correlated with shell size of the intermediate host (r = -0.955) and the common logarithm of the number of cercariae produced (r = -0.893). Comparisons between species suggest that exceptionally low rates of cercariae production in the intermediate host may be compensated for by rapid rates of egg production in the definitive host, implying a degree of integration in the schistosome life-cycle not previously appreciated. Most species of mammalian schistosomes have long-lived definitive hosts, and snail hosts capable of producing many cercariae; compensatory relationships are therefore less obvious in such species. Additional quantitative data on all aspects of schistosome life-histories, particularly rate and duration of egg production, are needed to confirm or refute the relationships discussed above.

show abstract

Section: I Mammalian Phase Of the Life-cyclementioning

confidence: 99%

A comparative study of the life-histories of mammalian schistosomes

Loker

1983

Parasitology

138

View full text Add to dashboard Cite

show abstract

“…The impetus of the discovery by Miyairi and Suzuki lead to the lifehistories of both S. haematobium and S. mansoni being described by Leiper in 1915. Johnston in 1917 erected the fifth genus of the schistosomes, Austrobilharzia, to be followed by the genus Schistosomatium Tanabe, 1923and Dendritobilharzia Skrjabin et Zakharrow, 1920. Travassos (1923 proposed the genus Macrobilharzia to include a very large male fluke, M. macrobilharzia.…”

Section: Historical Backgroundmentioning

confidence: 99%

A Review of the Family Schistosomatidae: excluding the GenusSchistosomafrom Mammals

Farley

1971

J. Helminthol.

View full text Add to dashboard Cite

Identification of members of the family Schistosomatidae presents problems not only because of the imperfect state of their taxonomy, but also because no attempt has been made to collect and organise the available data. There are only two general keys on the schistosomes (Price, 1929 ; Yamaguti, 1958) both of which are incomplete. The result of this is that many authors, too numerous to mention, list genera which are no longer valid and erect new species without comparing them with species to which they are obviously closely related.

show abstract

“…Because of its medical and veterinary relevance, we know a great deal more about the mammal-infecting genus Schistosoma Weinland, 1858 than we do about other genera of mammalian schistosomes (the North American genera Schistosomatium Tanabe, 1923 and Heterobilharzia Price, 1929, and the elephant schistosome Bivitellobilharzia Dutt & Srivastava, 1955). For the latter genus, we are largely ignorant of even the basics, including life cycles and patterns of definitive and intermediate host use, even though the mammalian hosts involved are large and conspicuous.…”

Section: Introductionmentioning

confidence: 99%

Molecular phylogenetics of the elephant schistosome Bivitellobilharzia loxodontae (Trematoda: Schistosomatidae) from the Central African Republic

et al. 2012

View full text Add to dashboard Cite

One of the most poorly known of all schistosomes infecting mammals is Bivitellobilharzia loxodontae. Nearly all of our available information about this species comes from the original description of worms that were obtained from an animal park-maintained elephant in Germany, probably a forest elephant Loxodonta cyclotis, originating from the present-day Democratic Republic of Congo. We obtained schistosome eggs from faecal samples from wild forest elephants from the Central African Republic. The eggs, which were similar in size and shape to those of described B. loxodontae, were sequenced for the 28S nuclear ribosomal gene and the mitochondrial cytochrome oxidase I (cox1) gene. In a phylogenetic analysis of 28S sequences, our specimens grouped closely with B. nairi, the schistosome from the Indian elephant Elephas maximus, to the exclusion of schistosomes from other genera. However, the eggs were genetically distinct (12% distance cox1) from those of B. nairi. We conclude the specimens we recovered were of B. loxodontae and confirm this is a distinct Bivitellobilharzia species. In addition to providing the first sequence data for B. loxodontae, this report also supports Bivitellobilharzia as a monophyletic group and gives the relative phylogenetic position of the genus within the Schistosomatidae. We also provide a review of the biology of this poorly known schistosome genus.

show abstract

The Life History of a New Schistosome, Schistosomatium pathlocopticum Tanabe, Found in Experimentally Infected Mice

Cited by 19 publications

References 0 publications

A comparative study of the life-histories of mammalian schistosomes

A comparative study of the life-histories of mammalian schistosomes

A Review of the Family Schistosomatidae: excluding the GenusSchistosomafrom Mammals

Molecular phylogenetics of the elephant schistosome Bivitellobilharzia loxodontae (Trematoda: Schistosomatidae) from the Central African Republic

Contact Info

Product

Resources

About