Your browser doesn't support javascript.
loading
Montrer: 20 | 50 | 100
Résultats 1 - 20 de 37
Filtre
1.
Mem. Inst. Oswaldo Cruz ; 101(supl.1): 21-27, Oct. 2006. ilus
Article Dans Anglais | LILACS | ID: lil-441223

Résumé

The reports on the occurrence of African planorbids in South America and of South American species in Africa and Asia are reviewed.


Sujets)
Animaux , Femelle , Mâle , Biomphalaria , Afrique , Asie , Brésil , Biomphalaria/anatomie et histologie , Biomphalaria/classification , Biomphalaria/génétique
2.
Mem. Inst. Oswaldo Cruz ; 100(5): 491-493, Aug. 2005.
Article Dans Anglais | LILACS | ID: lil-409966

Résumé

In the course of several trips to Argentina I had the opportunity of collecting specimens of Acrorbis petricola Odhner,1937, Biomphalaria orbignyi Paraense, 1975, B. peregrina (Orbigny, 1835), B. tenagophila (Orbigny, 1835) Lymnaea viatrix Orbigny, 1835, Antillorbis nordestensis (Lucena, 1954), B. intermedia (Paraense & Deslandes, 1962), B. oligoza Paraense, 1974, B. straminea (Dunker, 1848), Drepanotrema anatinum (Orbigny, 1835), D. cimex (Moricand, 1837), D. depressissimum (Moricand, 1837), D. heloicum (Orbigny, 1835), D. kermatoides (Orbigny, 1835), D. lucidum (Pfeiffer, 1839), L. columella Say, 1817, Physa acuta Draparnaud, 1805, and P. marmorata Guilding, 1828.


Sujets)
Animaux , Escargots/classification , Argentine
3.
Mem. Inst. Oswaldo Cruz ; 99(4): 357-362, Jun. 2004. ilus, mapas
Article Dans Anglais | LILACS | ID: lil-363852

Résumé

In the course of a trip to Ecuador I had the opportunity of collecting topotypic specimens of the following nominal species of pulmonate molluscs: Biomphalaria cousini Paraense, 1966; Planorbis equatorius Cousin, 1887; P. canonicus Cousin, 1887; Lymnaea cousini Jousseaume, 1887 and P. boetzkesi Miller, 1879. Additional findings were: Helisoma trivolvis (Say, 1817), Biomphalaria peregrina (Orbigny 1835), Drepanotrema anatinum (Orbigny, 1835), D. kermatoides (Orbigny, 1835), D. lucidum (Pfeiffer, 1839), D. surinamense (Clessin, 1884), Lymnaea columella Say, 1817 and Physa acuta Draparnaud, 1805. P. boetzkesi and P. canonicus are considered junior synonyms of Gyraulus hindsianus (Dunker, 1848) and Biomphalaria peregrina (Orbigny, 1835), respectively.


Sujets)
Animaux , Mollusca , Équateur
4.
Mem. Inst. Oswaldo Cruz ; 99(4): 439-442, Jun. 2004.
Article Dans Anglais | LILACS | ID: lil-363864
5.
Mem. Inst. Oswaldo Cruz ; 99(1): 23-24, Feb. 2004. ilus
Article Dans Anglais | LILACS | ID: lil-356438

Résumé

We report the first finding of Lymnaea viatrix south of parallel 41ºS, in rural and urban areas from Argentina. Ninety snails were collected during year 2000, from a concrete pond at a Public Square in El Bolsón Village, Río Negro province, and 811 snails in November 1999, and during 2000 from waterbodies within a farm at Cholila locality, Chubut province. Fasciola hepatica infection was detected in 0.9 percent snails from the rural area. We discuss the potential risk of L. viatrix to public health in urban areas and its epidemiological importance in rural areas of the Andean Patagonian region.


Sujets)
Animaux , Rats , Fasciola hepatica , Lymnea , Argentine , Rat Wistar
6.
Mem. Inst. Oswaldo Cruz ; 98(6): 767-771, Sept. 2003. ilus
Article Dans Anglais | LILACS | ID: lil-348345

Résumé

In the course of several trips to Peru I had the opportunity of collecting topotypic specimens of Biomphalaria andecola (Orbigny, 1835), B. helophila (Orbigny, 1835), B. pucaraensis (Preston, 1909), Drepanotrema limayanum (Lesson, 1830), D. kermatoides (Orbigny, 1835), and Lymnaea viatrix Orbigny, 1835, besides B. tenagophila (Orbigny, 1835), Helisoma trivolvis (Say, 1817), H. duryi (Wetherby, 1879), Physa acuta Draparnaud, 1801, and seemingly P. peruviana Gray, 1828. B. pucaraensis is considered a junior synonym of B. peregrina (Orbigny, 1835)


Sujets)
Animaux , Mâle , Femelle , Escargots , Pérou
7.
Mem. Inst. Oswaldo Cruz ; 98(4): 513-517, June 2003. ilus
Article Dans Anglais | LILACS | ID: lil-344246

Résumé

A description is given of Physa acuta Draparnaud, 1805, based on topotypic specimens from the Garonne river basin, and additional samples from the environs of the French cities of Montpellier and Perpignan. It proved indistinguishable, in shell and anatomy, from topotypic Physa cubensis Pfeiffer, 1839, thus leading the authors to admit the synonymy of the two nominal species under the older name, P. acuta


Sujets)
Animaux , Escargots
8.
Mem. Inst. Oswaldo Cruz ; 98(4): 519-521, June 2003. ilus
Article Dans Anglais | LILACS | ID: lil-344247

Résumé

A description is presented of the shell and anatomic characters of the planorbid mollusk Plesiophysa guadeloupensis ("Fischer" Mazé, 1883), based on topotypic specimens from a pond in Borricaud (Grande Terre, Guadeloupe). Comparison with previous descriptions of nominal species of Plesiophysa points to its identity with P. ornata (Haas, 1938), of which it is a senior synonym


Sujets)
Animaux , Mâle , Mollusca
9.
Mem. Inst. Oswaldo Cruz ; 98(1): 51-67, Jan. 30, 2003. ilus
Article Dans Anglais | LILACS | ID: lil-331382

Résumé

In the course of two trips to Central America (June 1967 and JulyAugust 1976) I had the opportunity of collecting topotypic specimens of Planorbis nicaraguanus Morelet, 1849, anatomically defined in this paper, and of P. yzabalensis Crosse & Fischer, 1879, the identity of the latter with Drepanotrema anatinum (Orbigny, 1835) is confirmed. The following planorbid species were also found: Helisoma trivolvis (Say, 1817) in Nicaragua, Guatemala, Costa Rica and Belize; H. duryi (Wetherby, 1879) in Costa Rica; Biomphalaria helophila (Orbigny, 1835) in Guatemala, Belize, Nicaragua, Costa Rica and El Salvador; B. kuhniana (Clessin, 1883) in Panama; B. obstructa (Morelet,1849) in Guatemala, Belize and El Salvador; B. straminea (Dunker, 1848) in Costa Rica; B. subprona (Martens, 1899) in Guatemala; D. anatinum (Orbigny,1835) in Belize, Guatemala, Nicaragua and Costa Rica; D. depressissimum (Moricand,1839) in Nicaragua, Costa Rica and Panama; D. lucidum (Pfeiffer, 1839) in Guatemala, Belize and Nicaragua; D. surinamense (Clessin, 1884) in Costa Rica and Panama; and Gyraulus percarinatus sp. n. in Panama. The occurrence of B. kuhniana and D. surinamense is first recorded in Central America, and Gyraulus percarinatus is the first representative of the genus provenly occurring in the American continent south of the United States. The following synonymy is proposed: Planorbis declivis Tate, 1870 = Biomphalaria helophila (Orbigny, 1835); Planorbis isthmicus Pilsbry, 1920 = Biomphalaria kuhniana (Clessin, 1883); Planorbis cannarum Morelet, 1849 and Segmentina donbilli Tristram, 1861 = Biomphalaria obstructa (Morelet, 1849); and Planorbis yzabalensis Crosse & Fischer, 1879 = Drepanotrema anatinum (Orbigny, 1835), confirming Aguayo (1933)


Sujets)
Animaux , Mâle , Femelle , Escargots , Amérique centrale , Escargots
10.
Mem. Inst. Oswaldo Cruz ; 97(4): 505-508, June 2002. ilus
Article Dans Anglais | LILACS | ID: lil-314533

Résumé

A new species of planorbid mollusc, Plesiophysa dolichomastix (Greek dolichos = long, mastix = flagellum), collected from Lagoa da Pedra, municipality of Santa Rosa, state of Goiás, Brazil (15°01'S, 47°13'W) is described. It is indistinguishable by the shell characters from the five congeneric species described so far: P. striata (Orbigny, 1841), P. granulata ("Shuttleworth" Sowerby, 1873), P. guadeloupensis ("Fischer" Mazé, 1883), P. ornata (Haas, 1938) and P. hubendicki Richards & Ferguson, 1962. It differs from the anatomically studied species in the following characters: about 50 ovotestis diverticula, against 12 in granulata, 100 in ornata, unstated in hubendicki; and length of flagella - about as long as the penial complex -, against about 1/3 to 1/6 in the other three


Sujets)
Animaux , Mâle , Femelle , Mollusca , Brésil , Mollusca
11.
12.
Mem. Inst. Oswaldo Cruz ; 91(2): 177-86, Mar.-Apr. 1996. ilus
Article Dans Anglais | LILACS | ID: lil-174375

Résumé

A definition of Biomphalaria helophila (Orbigny, 1835) is presented, based on examination of the shell and reproductive system of topotypic specimens and extended to a number of samples from other localities. The following nominal species and subspecies, collected from type localities, proved junior synonyms of B. helophila: Planorbis albicans Pfeiffer, 1839; Planorbis dentatus Gould, 1844; Planorbis dentiferus CB Adams, 1845; Planorbis dentiferus edentatus CB Adams, 1851; Planorbis dentiens Morelet, 1849; Planorbiula dentiens edentula Fischer & Crosse, 1880; Planorbis stagnicola Morelet, 1851; and Tropicorbis shimeki FC Baker, 1945. B. helophila was also identified in samples from Costa Rica, Guatemala, Haiti, Dominican Republic, Puerto Rico and Barbados.


Sujets)
Animaux , Biomphalaria/physiologie
13.
Mem. Inst. Oswaldo Cruz ; 91(2): 187-90, Mar.-Apr. 1996. ilus
Article Dans Anglais | LILACS | ID: lil-174376

Résumé

A description is given of the shell, head-foot, pulmonary wall, reproductive system and radula of Biomphalaria subprona (Martens, 1899). A diagnosis between it and two other congeneric species under 10 mm in shell diameter occurring in Middle America (Biomphalaria helophila and B. schrammi) is presented.


Sujets)
Animaux , Biomphalaria/physiologie
14.
Mem. Inst. Oswaldo Cruz ; 90(5): 605-9, set.-oct. 1995. ilus
Article Dans Anglais | LILACS | ID: lil-157275

Résumé

A description is given of the shell, renal organ, reproductive system and radula of topotypic specimens of Lymnaea cousini Jousseaume, 1887. A diagnosis between it and four other lymnaeids which also occur in South America and were previously studied by the author (L. columella, L. diaphana, L. viatrix and L. rupestris) is presented.


Sujets)
Animaux , Lymnea/physiologie
15.
Mem. Inst. Oswaldo Cruz ; 87(4): 545-8, out.-dez. 1992. ilus
Article Dans Anglais | LILACS | ID: lil-116368

Résumé

Biomphalaria prona from Lake Valencia, Venezuela (type locality) has a polymorphic shell wich in the great majority of specimens is wider, with fewer rapidly expanding whorls, the outer one subcarinate on the left side and more or less strongly deflected leftward. Besides those modal forms there are little frequent variants characterized by narrower shell with less rapidly expanding, regularly curved whorls directed forward. Recent studies have shown that such variants constitute the predominant shell phenotype in extralacustrine populations, but are anatomically and biochemically indistinguishable from the modal class of the Lake. In the present paper it is demonstrated that the nominal species Planorbis meridaensis Preston, 1907, from Mérida, Venezuela, is identical with B. prona (Martens, 1873) of wich it must be considered a junior synonym


Sujets)
Animaux , Biomphalaria/classification , Escargots/classification , Biomphalaria/anatomie et histologie , Escargots/anatomie et histologie , Venezuela
16.
Mem. Inst. Oswaldo Cruz ; 87(2): 171-9, abr.-jun. 1992. tab, ilus
Article Dans Anglais | LILACS | ID: lil-116301

Résumé

Two samples of Biomphalaria prona (Martens, 1873) from Lake Valencia (type locality) and seven from other Venezuelan localities were studied morphologically (shell and reproductive system) and biochemically (allozyme electrophoresis). In spite of marked differences in shell characters, all of them proved indistinguishable under the anatomic and biochemical criteria. So far B. prona has been considered an endemic species, restricted to Lake Valencia. It is now demonstrated that the extralacustrine populations refered to Biomphalaria havanensis (Pfeiffer, 1839) by several authors correspond in shell characters to an extreme variant of B. prona from the Lake and really belong to the last*mentioned species. They may be regarded as the result of a process of directional selection favoring a shell phenotype other than those making up the modal class in the Lake.


Sujets)
Animaux , Biomphalaria/anatomie et histologie , Biomphalaria/classification , Venezuela
17.
Mem. Inst. Oswaldo Cruz ; 87(supl.1): 179-90, 1992. tab, ilus
Article Dans Anglais | LILACS | ID: lil-116411

Résumé

A redescription of Halipegus dubius Klein, 1905, of Brazilian frogs Leptodactylus pentadactylus and L. ocellatus, is presented. The parasite was found exclusively in the buccal cavity, in number varying from 1 (in most instances) to 3, and exceptionally 25 (one instance). Morphological data were based on 40 whole-mounted specimens and 4 serially sectioned ones. Larval development takes place in planorbid snails (Biomphalaria glabrata and B. tenagophila) and in an undetermined species of cyclops. Working of the ovarian complex was followed by microscopical observation of life specimens


Sujets)
Animaux , Ovaire/anatomie et histologie , Trematoda/classification
19.
Mem. Inst. Oswaldo Cruz ; 84(3): 281-8, jul.-set. 1989. tab
Article Dans Anglais | LILACS | ID: lil-103675

Résumé

Susceptibily experiments were carried out with a Biomphalaria straminea-like planorbid snail (Biomphalaria aff. straminea, species inquirenda) from Expinillar, near Salto (Uruguay), in the area of the Salto Grande reservoir, exposed individually to 5 miracidia of Schistosoma mansoni (SJ2 and BH2 strains). Of 130 snails exposed to the SJ2 strain, originally infective to Biomphalaria tenagophila, 30 became infected (23%). The prepatent (precercaria) period ranged from 35 to 65 days. The cercarial output was irregular, following no definite pattern, varying from 138 to 76,075 per snail (daily average4.3 to 447.5 and ending up with death. Three specimens that died, without having shed cercarie, on days 69 (2) and 80 after exposure to miracidia, had developing secondary sporocysts in their tissues, justifying the prospect of a longer precercarial period in these cases. In a control group of 120 B. teangophila, exposed to the SJ2 strain, 40 became infected, showing an infection rate (33.3%) not significantly different from that of the Espinillar snail (X**2 = 3.26). No cercarie were produced by any ofd the espinilar snails exposed to miracidia of the BH2 strain, originally infective to Biomphalaria glabrata. Four specimens showed each a primary sporocyst in one entecle, which disappeared between 15 and 25 days post-exposure, and two others died with immature, very slender sporocysts in their tissues on days 36 and 54. In a control group of 100 B. glabrata exposed to BH2 miracidia, 94 shed cercariae (94%) and 6 remained negative. Calculation of Frandsen's (1979a, b) TCP/100 index shows that "Espinillar Biomphalaria-SJ2 S. mansoni" is a vector-parasite "compatible" combination. Seeing that tenagophila-borne schistosomiasis is prevalent in Rio de Janeiro and Säo Paulo states and has recently spread sothwards to Santa Catarina state, and the range of B. tenagophila overlaps taht of the Espinillar Biomphalaria, the possibility of schistosomiais establishing itself in Uruguay, although not imminent, is not to be disregarded


Sujets)
Animaux , Biomphalaria/parasitologie , Schistosoma mansoni/physiologie , Interactions hôte-parasite , Schistosoma mansoni/pathogénicité , Schistosomiase à Schistosoma mansoni/parasitologie , Uruguay
20.
Mem. Inst. Oswaldo Cruz ; 83(4): 405-9, out.-dez. 1988. tab
Article Dans Anglais | LILACS | ID: lil-75460

Résumé

Autofecundaçäo nos moluscos planorbídeos helisoma duryi e Helisoma trivolvis - Cinquenta espéciems de cinco cepas (10 de cada cepa) de helisoma duryi de Lima (Peru), St. Croix (Ilhas Virgens), Formosa (Brasil), Cartago (Costa Rica) e St. Vicent (Pequenas Antilhas), criados isoladamente durante cerca de 150 dias, depositaram 103 ovos.Os números de ovos postos pelos 10 espécimes de cada cepa foram respectivamente (ovos viáveis entre parênteses): 44(26), 1(1), 5(0), 15(7) e 38(0). A produçäo de ovos variou amplamente entre os indivíduos de cada cepa, havendo em todas elas, exceto na de St. Vicent, certo número de espécimes (3 a 9) que näo puseram nenhum ovo. Depois do período de observaçäo os espécimes isolados, inclusive os que näo puseram ovos, prontamente passaram a copular quando acasalados e produziram grande número de ovos. Os F1s gerados por autofecundaçäo foram perfeitamente interférteis, produzindo decendência normal por fecundaçäo cruzada. Dez espécimes de Helisoma trivolvis (cepa de Zempoala, México), também criados isoladamente durante cerca de 120, depositaram 646 ovos, dos quais 74 foram inviáveis. Nossos dados, somados aos de poucos estudados anteriores citados no texto, mostraram que no H. duryi a autofecundaçäo näo é um modo alternativo de reproduçäo täo eficiente quanto em muitos outros planorbídeos (no H. trivolvis é um pouco mais eficiente que no H. duryi). H. duryi, portanto, beneficia-se muito menos do hermafroditismo funcional que, além de outras vantagens, capacita um único indivíduo virgem a fundar uma nova populaçäo


Sujets)
Cochons d'Inde , Fécondation , /physiologie , Techniques in vitro
SÉLECTION CITATIONS
Détails de la recherche