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ABSTRACT The expression ‘you need to know to conserve’ is a well-known cliche among biologists. Documenting the richness of a group of organisms is the first step towards understanding biodiversity and preparing efficient conservation plans. In this context, many efforts have been made to quantify the number of species on Earth and estimate the number of species still unknown to science. A few countries have complete and integrated databases estimating the approximate number of species recorded for their territory, particularly in the Global South. In Brazil, a country of continental dimensions, revealing the richness of the second most diverse clade of invertebrates (=Mollusca) has been a goal of taxonomists. Recently, in an unprecedented, collective, and integrated effort among Brazilian malacologists, it was possible to estimate how many valid species of molluscs are there in Brazil. In this effort, more than 30 mollusc experts joined together to update the Taxonomic Catalogue of the Brazilian Fauna (TCBF), a governmental website that allows a quick and real-time updating of all Metazoan. So far, more than 5,000 updates have been made in TCBF, indicating the presence of 3,552 valid species of molluscs in Brazil, distributed among the main clades as follows: Caudofoveata (10 spp.), Solenogastres (6 spp.), Polyplacophora (35 spp.), Scaphopoda (43 spp.), Cephalopoda (92 spp.), Bivalvia (629 spp.) and Gastropoda (2,737 spp.). The present study, in addition to demonstrating for the first time the richness of Brazilian molluscs, also presents the state of the art of this important phylum of invertebrates highlighting its most representative and neglected groups.

https://doi.org/10.1590/s1984-4689.v40.e23026

An integrative study of the invasive jumping-snail Ovachlamys fulgens (Gastropoda, Helicarionidae) in Rio de Janeiro and its fast spreading in Southeastern and Southern Brazil
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MARCHI, CAROLINA R.

; CORRÊA-ANTÔNIO, JESSICA

; RODRIGUES, PAULO SÉRGIO

; FERNANDEZ, MONICA A.

; THIENGO, SILVANA C.

; BARBOSA, HELENE S.

; GOMES, SUZETE R.

Anais da Academia Brasileira de Ciências

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2021, Volume 93 N. 2 elocation e20190138

Abstract: En | Text: En | PDF: En

Abstract The Japanese invasive jumping snail Ovachlamys fulgens is a pest of ornamental plants and an intermediate host of a nematode that causes eosinophilic meningitis. We expand its distribution to eight municipalities from Rio de Janeiro State, and one locality from the Paraná State, and generated for the first time partial sequences of the cytochrome c oxidase subunit I (COI) gene for Brazilian populations. External morphology, reproductive system, shell, radula, and jaw were also analyzed and described. Twenty-one lots were collected from Rio de Janeiro, Niterói, Magé, Miguel Pereira, Petrópolis, Teresópolis, Nova Friburgo, Bom Jardim and Paraty, in Rio de Janeiro State, and from Foz do Iguaçu, Paraná State. External morphology, shell and reproductive system were typical of O. fulgens, with some peculiarities found in the shell and radula. A single haplotype was found, which was 100% similar to sequences of COI available in GenBank for specimens from Japan and Argentina. The species seems to be adapted to many habitats and be rapidly expanding its distribution in Southeastern and Southern Brazil, and other South America countries. We highlight the importance of monitoring O. fulgens, considering its potential to compete with native mollusks, attack several plants, and be a transmitter of diseases.

https://doi.org/10.1590/0001-3765202120190138 636 downloads

Diversity of non-marine gastropods of the Fiocruz Atlantic Forest Biological Station and adjacents urban areas, Rio de Janeiro, RJ, Brasil
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RANGEL, FLAVIA C.S.

; GOMES, SUZETE R.

; CANUTO, THAMIRES

; RODRIGUES, PAULO S.

; THIENGO, SILVANA C.

Anais da Academia Brasileira de Ciências

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2021, Volume 93 N. 2 elocation e20190691

Abstract: En | Text: En | PDF: En

Abstract Our main objective was to perform a preliminary survey of the non-marine gastropods at the Estação Biológica Fiocruz Mata Atlântica (EFMA) and its adjacent urban areas, also considering samples from other localities of the Parque Estadual da Pedra Branca received as donation, in Rio de Janeiro, RJ, Brazil. Infection by larval helminths of medical and veterinary importance was also investigated in 348 specimens of five freshwater species and two specimens of the terrestrial species Achatina fulica. In all, 584 samples of molluscs from 34 collection sites were obtained. They represented 31 species classified in 16 families. Fifteen species were exclusive to the EFMA area. In the urban area mainly exotic and/or synanthropic species were found. Some of them were found in the forest border as well. The freshwater Biomphalaria tenagophila, an intermediate host of the trematode that causes schistosomiasis mansoni, was found parasitized by Xiphidiocercarie cercariae and the Afro-asiatic Melanoides tuberculata by Pleurolophocercus cercaria. The finding of endemic and exotic species, including transmitters of parasites, demonstrate the importance of fast surveys such as the present study. However, considering the great diversity of endemic molluscs found in a relatively small part of the EFMA, we highlight the necessity of further additional studies.

https://doi.org/10.1590/0001-3765202120190691 215 downloads

First records of molluscs naturally infected with Angiostrongylus cantonensis (Nematoda: Metastrongyloidea) in Sergipe State, Northeastern Brazil, including new global records of natural intermediate hosts
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Ramos-de-Souza, Jucicleide

; Thiengo, Silvana Carvalho

; Fernandez, Monica Ammon

; Gomes, Suzete Rodrigues

; Corrêa-Antônio, Jéssica

; Clímaco, Marianna de Carvalho

; Garcia, Juberlan Silva

; Maldonado-Junior, Arnaldo

; Barbosa, Luciene

; Dolabella, Silvio Santana

Revista do Instituto de Medicina Tropical de São Paulo

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2018, Volume 60 elocation e51

Abstract: En | Text: En | PDF: En

ABSTRACT Human neural angiostrongyliasis is an emerging infectious disease caused by nematode Angiostrongylus cantonensis. The present study investigated the presence of Angiostrongylus spp. in terrestrial molluscs collected from the following areas in the Metropolitan Region of Aracaju, Sergipe State, Brazil: Barra dos Coqueiros, Nossa Senhora do Socorro, Sao Cristovao and Aracaju. In total, 703 specimens representing 13 mollusc species were screened for Angiostrongylus spp. Larvae of Angiostrongylus spp. were found in three species. Larvae recovered from Achatina fulica were used for experimental infection in Wistar rats (Rattus norvegicus). For specific identification of nematodes, the mitochondrial cytochrome c oxidase subunit I (COI) was sequenced from both larvae and adults recovered from molluscs and rats, respectively. Infection with A. cantonensis was detected in all municipalities and in the following three host species: Bulimulus tenuissimus, Cyclodontina fasciata (Barra dos Coqueiros), and A. fulica (Aracaju, Nossa Senhora do Socorro and Sao Cristovao). Co-infections were also found with Caenorhabditis sp. and Strongyluris sp. larvae. This is the first study of the helminth fauna associated with the terrestrial malacofauna in Sergipe State, and confirms that these three snail species are involved in the transmission of A. cantonensis in the state. In addition, B. tenuissimus and C. fasciata are newly reported natural hosts of the parasite.

https://doi.org/10.1590/s1678-9946201860051 2037 downloads

Primeiro registro de Plesiophysa guadeloupensis ("Fischer" Mazé) no Estado do Rio de Janeiro, Brasil
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Fernandez, Monica A.

; Thiengo, Silvana C.

; Paraense, Wladimir L.

Revista Brasileira de Zoologia

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sep 2006, Volume 23 N. 3 Pages 883 - 885

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

O presente trabalho trata do primeiro registro de Plesiophysa guadeloupensis (" Fischer" Mazé, 1883) no Estado do Rio de Janeiro, no município de Itaocara. Os exemplares foram coletados em uma área alagada situada no distrito de Jaguarembé em abril/maio de 2003 e março de 2005. São mencionadas as espécies encontradas em simpatria com P. guadeloupensis, assim como algumas características físicas e químicas da água (pH, oxigênio dissolvido e temperatura), além da atual distribuição geográfica do gênero Plesiophysa no Brasil.

This paper deals with the first report of Plesiophysa guadeloupensis (" Fischer" Mazé, 1883) from Rio de Janeiro State, in the municipality of Itaocara. The gastropods were collected at a swamp situated in the district of Jaguarembé in April-May 2003 and March 2005. Other species found together with P. guadeloupensis are mentioned, as well as some physical and chemical characteristics of the water (pH, dissolved oxygen and temperature), and the geographical distribution of the genus Plesiophysa in Brazil.

1615 downloads

Malacofauna límnica da área de influência do lago da usina hidrelétrica de Serra da Mesa, Goiás, Brasil.: I. Estudo qualitativo
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Thiengo, Silvana C.

; Santos, Sonia B.

; Fernandez, Monica A.

Revista Brasileira de Zoologia

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dec 2005, Volume 22 N. 4 Pages 867 - 874

Abstract: Pt En | Text: Pt En | PDF: Pt | PDF: En

A esquistossomose é uma importante doença endêmica associada a mudanças ambientais causadas por grandes projetos econômicos, tais como a construção de usinas hidrelétricas. A dificuldade de se prever o surgimento de focos de esquistossomose associados com estes empreendimentos e a existência de condições peculiares em cada tipo de projeto requerem estudos em cada uma dessas áreas, de forma a serem implementadas medidas preventivas adequadas. O número crescente de barragens no país é preocupante pois, além de criarem condições propícias ao desenvolvimento dos moluscos vetores, aumentam a população local e o turismo. Nessas áreas, a Organização Mundial de Saúde e a Fundação Nacional de Saúde recomendam ações preventivas contra a instalação de focos de esquistossomose, dentre elas, o monitoramento das populações de moluscos. Neste trabalho são apresentados dados obtidos por nossa equipe na área da Usina Hidrelétrica de Serra da Mesa (UHSM), Goiás, onde levantamentos qualitativos e quantitativos da malacofauna límnica foram realizados de 1997 a 2004, com o principal objetivo de investigar a ocorrência e a distribuição das espécies de interesse médico e veterinário. Vinte e oito espécies, pertencentes a nove diferentes famílias foram encontradas. Além de documentar novas ocorrências no Estado, é também apresentada a distribuição de duas espécies de importância médica, Biomphalaria straminea (Dunker, 1848) e Lymnaea columella Say, 1817, bem como de duas espécies exóticas, Corbicula fluminea (Müller, 1774) e Melanoides tuberculatus (Müller, 1774).

Schistosomiasis is an important endemic disease associated with environmental change caused by major economic development projects such as the construction of hydroelectric power facilities (dams and the lakes created by them). The difficulty of predicting emerging outbreaks of schistosomiasis associated with these kinds of projects, and the existence of conditions unique to particular projects, necessitate studies in each particular locality in order that appropriate preventive measures can be implemented. The increasing number of dams being built throughout Brazil is a problematic issue because these dams not only create conditions suitable for the establishment of the vector molluscs but also lead to increased permanent human settlement and tourism. The World Health Organization, as well as the Brazilian National Health Foundation, recommend a number of actions to prevent the establishment of schistosomiasis foci, including monitoring mollusc populations. This paper focuses on our work at Serra da Mesa dam, Goiás, where qualitative and quantitative surveys of the freshwater mollusc fauna have been undertaken during the period of 1997 to 2004, aiming mainly to investigate the occurrence and distribution of species of medical importance. Twenty-eight species, belonging to nine families, were found. In addition to documenting new records in the state this paper gives details of the distribution of the two species of medical importance, Biomphalaria straminea (Dunker, 1848) and Lymnaea columella Say, 1817, as well as the invasive freshwater species Corbicula fluminea (Müller, 1774) and Melanoides tuberculatus (Müller, 1774).

4670 downloads

Presence of Stongyluris-like larvae (Nematoda) in some terrestrial molluscs in Brazil
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Thiengo, Silvana C.

Memórias do Instituto Oswaldo Cruz

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oct 1995, Volume 90 N. 5 Pages 619 - 620

Abstract: En | Text: En | PDF: En

1101 downloads

Phyllocaulis variegatus (Mollusca: Veronicellidae), a new intermediate host for Brachylaima sp. (Digenea: Brachylaimatidae)
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Thiengo, Silvana C.

; Amato, Suzana B.

Memórias do Instituto Oswaldo Cruz

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oct 1995, Volume 90 N. 5 Pages 621 - 622

Abstract: En | Text: En | PDF: En

1148 downloads

Presence of Mermithid Larvae (Nematoda, Mermithidae) in Limax flavus and Sarasinula marginata (Mollusca, Gastropoda) in Brazil
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Thiengo, Silvana C.

Memórias do Instituto Oswaldo Cruz

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jun 1995, Volume 90 N. 3 Pages 347 - 347

Abstract: En | Text: En | PDF: En

800 downloads

10.

On the diversity of mollusc intermediate hosts of Angiostrongylus costaricensis Morera & Cespedes, 1971 in southern Brazil
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Teixeira, Carlos Graeff

; Thiengo, Silvana C.

; Thome, José Willibaldo

; Medeiros, Aline Bueno

; Camillo-Coura, Lea

; Agostini, Aventino A.

Memórias do Instituto Oswaldo Cruz

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sep 1993, Volume 88 N. 3 Pages 487 - 489

Abstract: En | Text: En | PDF: En

Veronicellid slugs are considered the most important intermediate hosts of Angiostrongylus costaricensis, an intra-arterial nematode of rodents. Studies undertaken in three localities in southern Brazil led to identification of molluscs other than veronicellid slugs as hosts of A. costaricensis: Limax maximus, Limax flavus and Bradybaena similaris. These data indicate a low host specificity of larval stages of A. costaricensis, as it has been reported to other congeneric species.

2650 downloads Cited 1 time in SciELO

11.

On Pomacea canaliculata (Lamarck, 1822) (Mollusca; Pilidae: Ampullariidae)
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Thiengo, Silvana C.

; Borda, Carlos E.

; Araújo, J. L. Barros

Memórias do Instituto Oswaldo Cruz

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mar 1993, Volume 88 N. 1 Pages 67 - 71

Abstract: En | Text: En | PDF: En

This paper deals with the morphology of Pomacea caniculata (Lamarck, 1822) collected at Corrientes, Argentina. Comparison is made with Pomacea lineata (Spix, 1827) and Pomacea sordida (Swainson, 1823). The shell is globose, heavy, with greenish or horn-colored periostracum and dark spiral bands; apex subelevated, 5-6 whorls increasing rather rapidly and separated by very deep suture. Aperture large, rounded to subelongated; lip sometimes reddish; umbilicus large and deep; operculum corneous, entirely closing the aperture. Ratios: shell width/shell length = 0.78-0.96 (mean 0.86); aperture length/shell length = 0.68-0.77 (mean 0.72). Radula similar to other congeneric species. Testis and spermiduct as in P. lineata and P. sordida; prostate cylindric and short, cream in color as the testis. Penial sheath straight bearing a central outer gland deeply embedded in the tissue of its basal portion and a large wrinkled gland occupying 2/3 of the distal tip of its inner surface; the rigth margin of the sheath overlaps the left one until 2/3 of its proximal end. Female reproductive apparatus similar to that P. lineata; vestigial male copulatory apparatus (penis and its sheath) present in all females examined.

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