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Santos ACA, Souza FB, Santos EP. Diet of an endangered Neotropical catfish ( Kalyptodoras bahiensis) from the Paraguaçu River, Bahia, Brazil. STUDIES ON NEOTROPICAL FAUNA AND ENVIRONMENT 2020. [DOI: 10.1080/01650521.2020.1728031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
| | - Fabiane B. Souza
- Instituto de Biologia, Universidade Federal da Bahia, Salvador, Brasil
| | - Edjane P. Santos
- Laboratorio de Ictiologia, Universidade Estadual de Feira de Santana, Feira de Santana, Brasil
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The development of Angiostrongylus vasorum (Baillet, 1866) in the freshwater snail Pomacea canaliculata (Lamarck, 1822). J Helminthol 2016; 89:755-9. [PMID: 26442708 DOI: 10.1017/s0022149x14000856] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Angiostrongylus vasorum is a parasitic nematode that infects the heart and pulmonary artery and its branches of domestic and wild canids. The parasite can use several species of terrestrial and aquatic molluscs as intermediate hosts, although susceptibility varies. Pomacea canaliculata is a mollusc found in lakes, swamps and rivers in South America. In this study, we evaluated the susceptibility, parasite growth, oviposition and larval development of 282 P. canaliculata infected with 500 A. vasorum first-instar larvae (L1). From day 5 post-infection (pi) to day 30 pi, seven specimens per day were sacrificed to recover the larval instars. We compared 50 egg masses from infected and uninfected molluscs to determine the number of eggs per clutch, the hatching rate and the growth of the molluscs. The percentage of recovered larvae ranged from 39.17% to 67.5%. First-stage larvae (L1) were found until day 19 pi, second-stage larvae (L2) were found from days 11 to 25 pi, and third-stage larvae (L3) were recovered only after day 19 pi. Infected snails exhibited the most eggs during spawning, although the rate of hatching and shell size were lower in the infected snails compared with controls. This is the first report of an experimental infection of P. canaliculata with A. vasorum, and the results confirm the non-specificity of the nematode in relation to the intermediate host and indicate the importance of epidemiological surveys of this parasite and mollusc.
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Cordeiro LM, Borghezan R, Trajano E. Subterranean biodiversity in the Serra da Bodoquena karst area, Paraguay river basin, Mato Grosso do Sul, Southwestern Brazil. BIOTA NEOTROPICA 2014. [DOI: 10.1590/1676-06032014011414] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We present herein a synthesis of faunistic data from caves in the Serra da Bodoquena karst area, middle Paraguay River basin, Mato Grosso do Sul State. Those include phreatic, submerged and dry caves. Emphasis is given to troglobites (exclusively subterranean species), potentially threatened due to their morphological, physiological and behavioral specializations, associated to generally small distributions. The Bodoquena karst area distinguishes as a spot of high diversity of troglobites, such as trichomycterid and heptapterid catfishes, aquatic planarians and gastropods, arachnids (Eusarcus opilionids, ctenid spiders), Polydesmida diplopods, several collembolans, some insects, and Peracarida crustaceans, which include interesting phylogenetic relicts as spelaeogriphaceans. Four geographic compartments corresponding to microbasins, seemingly with biogeographic importance for the subterranean fauna, are recognized. Phreatobic troglobites (Trichomycterus catfishes, aquatic peracarids, planarians) distribute widely across these compartments and some well beyond (the spelaeogriphacean Potiicoara brasiliensis reaches Mato Grosso state), while those living in base-level streams (Rhamdia and Ancistrus catfishes) and the terrestrial ones, that live in the vadose (aerated zone) are generally restricted to one compartment. Many subterranean ecosystems in Mato Grosso do Sul are endangered by several threats described here and urgent actions for effective protection are required to guarantee a sustainable use of the land and the karst aquifers.
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Medeiros C, Scholte RGC, D'ávila S, Caldeira RL, Carvalho ODS. Spatial distribution of Lymnaeidae (Mollusca, Basommatophora), intermediate host of Fasciola hepatica Linnaeus, 1758 (Trematoda, Digenea) in Brazil. Rev Inst Med Trop Sao Paulo 2014; 56:235-52. [PMID: 24879003 PMCID: PMC4085869 DOI: 10.1590/s0036-46652014000300010] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Accepted: 09/17/2013] [Indexed: 11/21/2022] Open
Abstract
Snails of the family Lymnaeidae act as intermediate hosts in the
biological cycle of Fasciola hepatica, which is a biological agent
of fasciolosis, a parasitic disease of medical importance for humans and animals. The
present work aimed to update and map the spatial distribution of the intermediate
host snails of F. hepatica in Brazil. Data on the distribution of
lymnaeids species were compiled from the Collection of Medical Malacology
(Fiocruz-CMM, CPqRR), Collection of Malacology (MZUSP), “SpeciesLink” (CRIA) network
and through systematic surveys in the literature. Our maps of the distribution of
lymnaeids show that Pseudosuccinea columella is the most common
species and it is widespread in the South and Southeast with few records in the
Midwest, North and Northeast regions. The distribution of the Galba
viatrix, G. cubensis and G. truncatula
showed a few records in the South and Southeast regions, they were not reported for
the Midwest, North and Northeast. In addition, in the South region there are a few
records for G. viatrix and one occurrence of Lymnaea
rupestris. Our findings resulted in the first map of the spatial
distribution of Lymnaeidae species in Brazil which might be useful to better
understand the fasciolosis distribution and delineate priority areas for control
interventions.
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Affiliation(s)
- Camilla Medeiros
- Programa de Pós-Graduação em Ciências da Saúde, Doenças Infecciosas e Parasitárias, Centro de Pesquisas René Rachou, Fiocruz, Belo Horizonte, Minas Gerais, Brazil
| | | | - Sthefane D'ávila
- Museu de Malacologia Prof. Maury Pinto de Oliveira, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil
| | - Roberta Lima Caldeira
- Programa de Pós-Graduação em Ciências da Saúde, Doenças Infecciosas e Parasitárias, Centro de Pesquisas René Rachou, Fiocruz, Belo Horizonte, Minas Gerais, Brazil
| | - Omar Dos Santos Carvalho
- Laboratório de Helmintologia e Malacologia Médica, Centro de Pesquisas René Rachou, Fiocruz, Belo Horizonte, Minas Gerais, Brazil
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Souza MAA, Melo AL. Caracterização de larvas de trematódeos emergentes de moluscos gastrópodes coletados em Mariana, Minas Gerais, Brasil. IHERINGIA. SERIE ZOOLOGIA 2012. [DOI: 10.1590/s0073-47212012000100002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Em levantamento malacológico realizado no município de Mariana, estado de Minas Gerais, Brasil, entre abril de 2003 e fevereiro de 2004 foram encontrados moluscos Biomphalaria glabrata (Say, 1818) e Physa marmorata Guilding, 1828 albergando larvas de trematódeos digenéticos. Em B. glabrata foram observadas além de cercária de Schistosoma mansoni Sambon, 1907, estrigeocercária, dois tipos de xifidiocercária, cercária ocelífera e dois tipos de gimnocéfala, enquanto em P. marmorata a única forma larvar emergente foi a cercária equinóstoma. Algumas das cercárias encontradas diferem daquelas descritas na literatura.
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Santos CM, Eskinazi-Sant'Anna EM. The introduced snail Melanoides Tuberculatus (Muller, 1774) (Mollusca: Thiaridae) in aquatic ecosystems of the Brazilian Semiarid Northeast (Piranhas-Assu River basin, State of Rio Grande do Norte). BRAZ J BIOL 2010; 70:1-7. [DOI: 10.1590/s1519-69842010000100003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2008] [Accepted: 08/21/2008] [Indexed: 11/21/2022] Open
Abstract
Records of the gastropod Melanoides tuberculatus (Müller, 1774), family Thiaridae, in the Piranhas-Assu River basin in Rio Grande do Norte reveal the dispersal of this native Southeast Asian and East African species into aquatic environments of the Brazilian semiarid region, including artificial environments (reservoirs) and lotic systems. The eutrophic conditions of the local waterbodies appear to favor the present situation, where this invasive species reaches extremely high densities, sometimes over 10,000 ind.m-2 as in Armando Ribeiro Gonçalves Reservoir. These observations indicate the immediate need for new studies on the spatial distribution of the species and its potential impact on the biodiversity and water quality of the waterbodies of the semiarid region of the state. Implantation of regular and systematic monitoring of the aquatic resources of the region is urgently required.
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Affiliation(s)
- CM. Santos
- Federal University of Rio Grande do Norte, Brazil
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Thiengo SC, Mattos AC, Santos SB, Fernandez MA. Freshwater snails and schistosomiasis mansoni in the state of Rio de Janeiro, Brazil: VI--Noroeste Fluminense Mesoregion. Mem Inst Oswaldo Cruz 2008; 101 Suppl 1:239-45. [PMID: 17308776 DOI: 10.1590/s0074-02762006000900037] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2006] [Accepted: 06/26/2006] [Indexed: 11/21/2022] Open
Abstract
In this paper, the last of a series dealing with the survey of freshwater gastropods of the state of Rio de Janeiro, the results of collections carried out in the Noroeste Fluminense Mesoregion from 2002 to 2005 are presented and revealed the occurrence of 20 species: Antillorbis nordestensis; Biomphalaria glabrata; B. straminea; B. tenagophila; Drepanotrema anatinum; D. cimex; D. depressissimum; D. lucidum; Ferrissia sp.; Gundlachia ticaga; Gundlachia sp.; Heleobia sp.; Idiopyrgus sp.; Lymnaea columella; Melanoides tuberculatus; Physa acuta; P. marmorata; Plesiophysa guadeloupensis; Pomacea lineata; and Pomacea sp. Concerning the snail hosts of schistosomiasis the three natural vectors were identified and, although no specimens were found harbouring larval forms of Schistosoma mansoni, different kinds of cercariae had been observed.
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Affiliation(s)
- Silvana C Thiengo
- Departamento de Malacologia, Instituto Oswaldo Cruz-Fiocruz, Av. Brasil 4365, 21040-900 Rio de Janeiro, RJ, Brazil.
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Rocha-Miranda F, Martins-Silva MJ. First record of the invasive snail Melanoides tuberculatus (Gastropoda: Prosobranchia: Thiaridae) in the Paranã River Basin, GO, Brazil. BRAZ J BIOL 2007; 66:1109-15. [PMID: 17299947 DOI: 10.1590/s1519-69842006000600018] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The Thiarid snail Melanoides tuberculatus (Müller, 1774), native to Asia and East Africa was recorded for the first time in the Paranã River basin, Goiás State. There is no evidence concerning introduction vectors but aquarium releases is the most probable vector. Specimens were collected at three different water bodies after twenty-seven rivers were investigated. The possible spread of this species to other habitats and potential effects on native thermal water communities are discussed.
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Affiliation(s)
- F Rocha-Miranda
- Universidade de Brasília, Departamento de Zoologia, Campus Universitário Darcy Ribeiro, ICC, Ala Sul, CEP 70910-900, Brasília, DF, Brazil.
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Giovanelli A, da Silva CLPAC, Leal GBE, Baptista DF. Habitat preference of freshwater snails in relation to environmental factors and the presence of the competitor snail Melanoides tuberculatus (Müller, 1774). Mem Inst Oswaldo Cruz 2005; 100:169-76. [PMID: 16021304 DOI: 10.1590/s0074-02762005000200010] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Our objective is to evaluate the habitat preference of freshwater snails in relation to environmental factors and the presence of the competitor snail Melanoides tuberculatus. In the first phase, snails was collected at 12 sites. This sampling sites presented a degree of organic input. In the second phase 33 sampling sites were chosen, covering a variety of lotic and lentic environments. The snail species found at Guapimirim, state of Rio de Janeiro, displayed a marked habitat preference, specially in relation to the physical characteristics of each environment. Other limiting factors for snail distribution at the studied lotic environments were the water current velocity and the amount of organic matter, mainly to Physa marmorata, M. tuberculatus, and Biomphalaria tenagophila. The absence of interactions between M. tuberculatus and another snails could be associated to the distinct spatial distribution of those species and the instability of habitats. This later factor may favor the coexistence of M. tuberculatus with B. glabrata by reduction of population density. In areas of schistosomiasis transmission some habitat modification may add to the instability of the environment, which would make room for the coexistence of M. tuberculatus and Biomphalaria spp. In this way, some of the usual measures for the control of snail hosts would prevent the extinction of populations of Biomphalaria spp. by M. tuberculatus in particular habitats.
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Affiliation(s)
- Alexandre Giovanelli
- Laboratório da Avaliação e Promoção da Saúde Ambiental, Departamento de Biologia, Instituto Oswaldo Cruz-Fiocruz, Av. Brasil 4365, 21045-900 Rio de Janeiro, RJ, Brasil
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Thiengo SC, Mattos AC, Boaventura MF, Loureiro MS, Santos SB, Fernandez MA. Freshwater snails and schistosomiasis mansoni in the state of Rio de Janeiro, Brazil: V -- Norte Fluminense Mesoregion. Mem Inst Oswaldo Cruz 2004; 99:99-103. [PMID: 15486644 DOI: 10.1590/s0074-02762004000900018] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this paper, the fifth of a series dealing with the survey of freshwater gastropods of the state of Rio de Janeiro, the results of collections carried out in the Norte Fluminense Mesoregion from 2002 to 2003 are presented and revealed the occurrence of 19 species: Antillorbis nordestensis; Burnupia sp.; Biomphalaria tenagophila; Drepanotrema anatinum; Drepanotrema cimex; Drepanotrema depressissimum; Drepanotrema lucidum; Ferrissia sp.; Gundlachia ticaga; Gundlachia sp.; Heleobia sp.; Hebetancylus moricandi; Idiopyrgus sp.; Lymnaea columella; Melanoides tuberculatus; Physa acuta; Physa marmorata; Pomacea sordida, and Pomacea sp. Concerning the snail hosts of Schistosoma mansoni only B. tenagophila was found, in contrast with other previuosly studied mesoregions.No specimens were found harbouring larval forms of S. mansoni although different kinds of cercariae had been observed. An account about the current schistosomiasis transmission sites in this Mesoregion is presented as well.
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Affiliation(s)
- Silvana C Thiengo
- Departamento de Malacologia, Instituto Oswaldo Cruz-Fiocruz, Av. Brasil 4365, 21045-900 Rio de Janeiro, RJ, Brazil.
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Thiengo SC, Mattos AC, Boaventura MF, Fernandez MA. Freshwater snails and Schistosomiasis mansoni in the state of Rio de Janeiro, Brazil: IV - Sul Fluminense Mesoregion. Mem Inst Oswaldo Cruz 2004; 99:275-80. [PMID: 15273799 DOI: 10.1590/s0074-02762004000300006] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this paper, the forth of a series dealing with the survey of freshwater gastropods of the state of Rio de Janeiro, the results of collections carried out in the Sul Fluminense Mesoregion from 2000 to 2002 are presented and revealed the occurrence of 18 species: Antillorbis nordestensis; Biomphalaria glabrata; Biomphalaria peregrina; Biomphalaria straminea; Biomphalaria tenagophila; Drepanotrema anatinum; Drepanotrema cimex; Drepanotrema lucidum; Ferrissia sp.; Gundlachia ticaga; Gundlachia sp.; Heleobia sp.; Lymnaea columella; Melanoides tuberculatus; Physa acuta; Physa marmorata; Pomacea sordida and Pomacea sp. As to the snail hosts of Schistosoma mansoni the most frequent species was B. tenagophila, found in all municipalities surveyed, except Parati. Besides new records the present study extends the distribution of B. peregrina and B. straminea in the state. No specimens were found harbouring larval forms of S. mansoni although different kinds of cercariae had been observed. An account about the current schistosomiasis transmission sites in this Mesoregion is presented as well.
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Affiliation(s)
- Silvana C Thiengo
- Departamento de Malacologia, Instituto Oswaldo Cruz-Fiocruz, Rio de Janeiro, RJ, 21045-900, Brasil.
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Thiengo SC, Fernandez MA, Boaventura MF, Magalhães MG, Santos SB. Freshwater snails and Schistosomiasis mansoni in the state of Rio de Janeiro, Brazil: III--Baixadas Mesoregion. Mem Inst Oswaldo Cruz 2003; 97 Suppl 1:43-6. [PMID: 12426593 DOI: 10.1590/s0074-02762002000900010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In this paper, the third of a series dealing with the survey of freshwater gastropods of the state of Rio de Janeiro, the results of collections carried out in the Mesoregion Baixadas from 2000 to 2002 are presented. Twenty-two species, belonging to seven families, were found. As to the snail intermediate hosts of Schistosoma mansoni, the most frequent species was Biomphalaria tenagophila besides some new findings of Biomphalaria straminea. No specimens were found harboring larval forms of S. mansoni although different kinds of cercariae had been observed.
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Affiliation(s)
- Silvana C Thiengo
- Departamento de Malacologia, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, 21045-900, Brasil.
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Thiengo SC, Fernandez MA, Boaventura MF, Santos SB, Mattos AC. Freshwater snails and Schistosomiasis mansoni in the State of Rio de Janeiro, Brazil: II--Centro Fluminense Mesoregion. Mem Inst Oswaldo Cruz 2002; 97:621-6. [PMID: 12219122 DOI: 10.1590/s0074-02762002000500004] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
During the course of a survey carried out from 2000 to 2001 in the Centro Fluminense Mesoregion of the State of Rio de Janeiro 22 molluscan species were found. Many of the records are new due to the dearth of previous studies. Concerning the snail hosts of Schistosoma mansoni, the most frequently encountered species was Biomphalaria tenagophila, as it occurred in all the surveyed municipalities. There are new records of Biomphalaria straminea and Biomphalaria peregrina which is regarded as a potential intermediate host. Drepanotrema lucidum and Antillorbis nordestensis were found to be shedding echinostome cercariae and strigid cercariae respectively. An account about the current schistosomiasis transmission sites in this Mesoregion is presented as well.
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Affiliation(s)
- Silvana C Thiengo
- Departamento de Malacologia, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, 21045-900, Brasil
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Thiengo SC, Fernandez MA, Boaventura MF, Grault CE, Silva HF, Mattos AC, Santos SB. Freshwater snails and schistosomiasis mansoni in the State of Rio de Janeiro, Brazil: I-- Metropolitan mesoregion. Mem Inst Oswaldo Cruz 2002; 96 Suppl:177-84. [PMID: 11586447 DOI: 10.1590/s0074-02762001000900028] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In order to elaborate a planorbid chart of the State of Rio de Janeiro a survey of freshwater gastropods in the Metropolitan Mesoregion of this State was performed and revealed the occurrence of 20 species: Antillorbis nordestensis (Lucena, 1954); Biomphalaria glabrata (Say, 1818); Biomphalaria schrammi (Crosse, 1864); Biomphalaria straminea (Dunker, 1848); Biomphalaria tenagophila (Orbigny, 1835); Burnupia sp.; Drepanotrema anatinum (Orbigny, 1835); Drepanotrema cimex (Moricand, 1839); Drepanotrema lucidum (Pfeiffer, 1839); Ferrissia sp.; Gundlachia ticaga (Marcus & Marcus, 1962); Heleobia davisi Silva & Thomé, 1985; Lymnaea columella Say, 1817; Melanoides tuberculatus (Müller, 1774); Physa cubensis Pfeiffer, 1839; Physa marmorata Guilding, 1828; Pomacea sp.; Pomacea canaliculata (Lamarck, 1822); Pomacea lineata (Spix, 1827) and Pomacea sordida (Swainson, 1823). Among the planorbid species B. tenagophila was the most frequent, occurring in all municipalities surveyed. The present study extends the distribution of B. straminea in the State of Rio de Janeiro and reports new records for A. nordestensis, B. schrammi, G. ticaga, H. davisi and the genera Burnupia and Ferrissia. An account about the current transmission areas of schistosomiasis mansoni in this Mesoregion is presented as well.
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Affiliation(s)
- S C Thiengo
- Departamento de Malacologia, Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, 21045-900, Brasil.
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Fernandez MA, Thiengo SC, Boaventura MF. [Freshwater snails of the Campus of Manguinhos, Oswaldo Cruz Foundation, Rio de Janeiro, RJ]. Rev Soc Bras Med Trop 2001; 34:279-82. [PMID: 11460215 DOI: 10.1590/s0037-86822001000300009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A survey of freshwater gastropods of the Campus of Manguinhos, Fundação Oswaldo Cruz, Rio de Janeiro, was carried out during the last two years aiming to compare the current species with those found at the beginning of this century. Among 18 breeding sites in 880,000m2 of the surveyed area, 13 showed the following species: Antillorbis nordestensis; Biomphalaria glabrata; Biomphalaria straminea; Lymnaea columella; Melanoides tuberculatus; Physa cubensis; Pomacea glauca and Pomacea lineata. Notably, Biomphalaria tenagophila reported by Lutz in 1918, had disappeared and B. straminea and the Asiatic thiarid M. tuberculatus had been introduced. No specimens infected with Schistosoma mansoni were found.
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Affiliation(s)
- M A Fernandez
- Departamento de Malacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ.
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