DOI: 10.15560/22.5.796

Authors: Magno Borges, Marcela Fonseca, Rodrigo Pessoa, Ronaldo Reis-Junior, Fernanda Santos, Isabela Queiroz, Sidney Rocha, Roberta Franco, Ana Júlia Fernandes, Newton Barbosa, Maurício Faria

Abstract: The Golden Mussel, Limnoperna fortunei (Dunker, 1857), an invasive bivalve originating from Asia, has rapidly spread throughout South American river basins since its introduction around 1990. This study investigates the presence of L. fortunei in the middle stretch of the São Francisco River in Brazil. Sixteen collection stations were established along the river, spanning the municipalities of São Francisco, São Romão, Ibiaí, and Pirapora. Limnoperna fortunei was confirmed in all sampling locations within São Francisco and São Romão, constituting the first report of this invasive species in the middle São Francisco.

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DOI: 10.15560/22.4.618

Authors: José Enrique Barraza, Verónica Melara, Yasmín Quintana, Charles R. Knapp, Kentaro Inoue

Abstract: We examined 35 sites across 24 rivers, lakes, and lagoons in El Salvador and documented two native and one non-native freshwater mussel species in addition to the invasive Corbicula. Phylogenetic analyses supported the synonymy of Nephronaias lempensis Marshall, 1926, under Nephronaias goascoranensis (Lea, 1858). Mussel distributions were patchy; Mycetopoda subsinuata (Sowerby, 1868) occurred in soft, lentic habitats, whereas N. goascoranensis occupied a broader range. Sinanodonta pacifica (Heude, 1878), a non-native species, occurred in the upper Lempa basin, and Corbicula showed recent expansion. These results provide essential data for conservation planning.

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DOI: 10.15560/22.3.567

Authors: Tulio F. Villalobos-Guerrero, Claudia Ventura-López, José Manuel Morales-Pulido, Luis Manuel Jáquez-Domínguez, Omar Valencia-Méndez

Abstract: The Mediterranean Mussel, Mytilus galloprovincialis Lamarck, 1819, is regarded by the federation as a high-risk invasive species in Mexico. Use of integrative taxonomy and niche modelling confirms mass aggregations in Ensenada harbour (Bahía de Todos Santos), Baja California, and forecasts this species’ presence in protected areas of the Gulf of California. While M. galloprovincialis is profitable in aquaculture, the economic benefit complicates efforts to evaluate and manage its invasive potential. This is the first detailed assessment of its non-native status in Mexican waters, and we emphasise the urgent need for a strategic plan to balance its economic advantages against environmental risks.

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DOI: 10.15560/22.2.224

Authors: Dilenia E. Martínez, Wilfredo A. Matamoros, Claudia C. Lardizabal, Kevin A. Soto Venegas, Yasmín Quintana, Kentaro Inoue

Abstract: Freshwater mussels were surveyed in 32 sites across rivers, lakes, and lagoons in Honduras and five species (two Unionidae and three Mycetopodidae) confirmed. Anodontites tortilis and Mycetopoda subsinuata are reported for the first time from the country. Mussel distributions were patchy, with Caribbean drainages harboring only Nephronaias hjalmarsoni, while up to four species co-occurred in Pacific drainages. Phylogenetic analyses revealed polyphyly in Nephronaias and Anodontites, highlighting unresolved taxonomy. These results provide critical baseline data on species diversity, distributions, and conservation priorities for Honduras’ understudied freshwater mussel fauna.

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DOI: 10.15560/21.6.1220

Authors: Roberto Carmona, David Carmona, Francisco Omar López-Fuerte, Enrique Flores

Abstract: The Asian Clam, Corbicula fluminea (O.F. Müller, 1774), is a high-risk invasive species in Mexico. The first record for the country dates back to 1969, and by 2024 its presence had been documented in 26 of the 32 Mexican states. In June 2025, the presence of C. fluminea was detected in the San Ignacio oasis, which has potential repercussions for endemic species there and highlights the urgent need to implement a control and eradication program for C. fluminea in the San Ignacio oasis. Monitoring of nearby oases is also necessary.

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DOI: 10.15560/21.2.248

Authors: Rubens Tomio Honda, Igor Christo Miyahira, Flávio Dias Passos

Abstract: The Tocantins river basin was one of the few regions in Brazil considered free of Golden Mussel, Limnoperna fortunei (Dunker, 1857). This is an invasive species that has been dispersing throughout South America since 1990. We report the first record of this species in the state of Tocantins. Its presence there represents a problem in the region and a major alert for the Amazon Basin. The Tocantins river basin constitutes one of the gateways to the Amazon Basin.

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DOI: 10.15560/20.4.859

Authors: Mayara Carneiro Beltrão, Natalia Joana Rebello da Cunha, Yan de Oliveira Laaf, Fernando Luiz Diehl, Tayse Demetro dos Santos

Abstract: The mussel Perna viridis, commonly known as Green Mussel, is native from the Indo-Pacific region and has been introduced in various countries around the globe. In Brazil, the species has already been recorded in Rio de Janeiro and Ceará states. With the aim of assessing the presence of mussels in the southern region of the country, 14 individuals were collected in the Paranaguá Estuarine Complex, Paraná. The mussels were found attached at a depth of 2 m on the artificial structure of Ponta do Poço Marina. The DNA was extracted using a commercial kit, the COI gene was amplified through PCR using the primers dgL-CO-1490 and dgHCO-2198, sequenced by the Sanger method, and the species was identified through the BOLD Systems. The phylogenetic tree was built on the software MEGA 11 using 28 sequences from three Perna species. Therefore, the present study confirms the occurrence of P. viridis in Brazil through molecular identification for the first time and adds a second Brazilian state where it has been recorded. The Brazilian coastline provides optimal environmental conditions for the establishment and development of P. viridis.

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DOI: 10.15560/20.3.728

Authors: Axl Ramos-Morales, Julio D. Gómez-Vásquez, María del Socorro García-Madrigal, J. Rolando Bastida-Zavala

Abstract: The port fouling fauna from Mexico has recieved greater study in the last 15 years. By improving our knowledge of fouling invertebrates on artificial substrates on the Southern Pacific coast of Mexico, we can better understand their distribution and prevent bioinvasions. The specimens listed in this present study come from PVC plates that were placed between June 2019 to June 2020 submerged at 1 m depth, on four docks of the Chahué Marina, Oaxaca, Mexico. Forty-four taxa, representing nine phyla were identi-fied: Sipuncula (1 species), Entoprocta (1), Bryozoa (3), Arthropoda (3), Porifera (4), Cnidaria (5), Chordata (6), Mollusca (10) and Annelida (11). Thirty taxa were identified to species, with two still requiring confirmation. Five were identified to genus, two to family, and five to class level. From the 30 identified species, 18 were non-native species: one entoproct, one mollusk, two bryozoans, three hydrozoans, three barnacles, four polychaetes, and four ascidians. These results include seven new records from the state of Oaxaca: one entoproct, one barnacle, two bryozoans, and three hydrozoans.

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DOI: 10.15560/19.4.485

Authors: Gerald R. Dinkins, Barbara J. Dinkins, Hugh D. Faust, Robert T. Eldridge, Brian M. Mize

Abstract: We present new drainage records for five freshwater mussels in the Sequatchie River, a tributary of the Tennessee River. We also report the rediscovery of Purple Lilliput, Toxolasma lividum Rafinesque, 1831, Tennessee Pigtoe, Pleuronaia barnesiana (Lea, 1838), and the federally endangered Slabside Pearlymussel, Pleuronaia dolabelloides (Lea, 1840), and we provide information on other mussel species found in our survey. In the Sequatchie River, T. lividum was last seen in 1957 and P. barnesiana and P. dolabelloides were last seen in 1980. The discovery of five new drainage records and rediscovery of three rare species highlights the need for additional mussel surveys in the Sequatchie River and the importance of surveys in conservation efforts.

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DOI: 10.15560/18.6.1255

Authors: Chase H. Smith, Clinton R. Robertson, Charles R. Randklev

Abstract: The Trinity Pigtoe, Fusconaia chunii (Lea, 1862), is a freshwater mussel endemic to the Trinity River drainage in Texas. Here, we report the first population of F. chunii in the San Jacinto River drainage in Texas. We identified three specimens of F. chunii using DNA barcoding, which were morphologically indistinguishable from syntopic Fusconaia flava (Rafinesque, 1820). A similar issue occurs in the Trinity River drainage. Fusconaia chunii is listed as state threatened, and future research is necessary to assess its status within the San Jacinto River drainage

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DOI: 10.15560/18.3.629

Authors: Bianca Medeiros Vendramini, Eliane Pintor de Arruda

Abstract: The Itupararanga Reservoir, located within an environmental protection area, is an important water source that supplies four cities in the state of São Paulo. Samples of mollusks were collected in the reservoir to create an inventory of species and identify possible bioindicators. Thirteen species were identified: Diplodon caipira (Ihering, 1893), Anodontites trapesialis (Lamarck, 1819), Pisidium globulus Clessin, 1888, Pomacea figulina (Spix in Wagner, 1827), Omalonyx convexus (Heynemann, 1868), Drepanotrema cimex (Moricand, 1839), Biomphalaria tenagophila (d’Orbigny, 1835), Uncancylus concentricus (d’Orbigny, 1835), Stenophysa marmorata (Guilding, 1828), and Pseudosuccinea columella (Say, 1817), which are native to Brazil, and Corbicula fluminea (O.F. Müller, 1774), Melanoides tuberculata (O.F. Müller, 1774), and Physa acuta Draparnaud, 1805, which are invasive species. This is the first inventory of mollusks in this area, and this initial study will allow complementary research into populational ecology. Additionally, this inventory contributes records that clarify the areas of occurrence of the reported species.

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DOI: 10.15560/18.2.391

Authors: James D. Williams, Jason M. Wisniewski, Gerald R. Dinkins

Abstract: The Coosa Elktoe, Alasmidonta mccordi Athearn, 1964, was previously known only from the type specimen collected in the Coosa River, St. Clair County, Alabama. Based on the discovery of five previously misidentified specimens in three museum lots, we extend the distribution of A. mccordi into the Etowah and Conasauga Rivers, tributaries of the Coosa River in northwest Georgia. Shell morphology of these museum specimens compare favorably with the only known specimen of the species. The conservation status of A. mccordi is examined in light of its wider historical distribution in the Coosa River drainage. We include recommendations for future research to detect extant populations of this presumed extinct freshwater mussel.

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DOI: 10.15560/17.6.1627

Authors: Yan Felipe Figueira Soares, Maria Júlia Martins-Silva

Abstract: Corbicula fluminea (Müller, 1774) is an Asian freshwater clam that is widely distributed throughout the world through multiple introductions. Its invasion can cause environmental and economic damage. In Brazil, C. fluminea is recorded in all major hydrographic basins. Here, we report the first record of C. fluminea in the Chapada dos Veadeiros region of Goiás, Brazil. This new record extends the known distribution of this species to a conserved area in the Cerrado biome, towards areas of interest for conservation and integral protection units of the biodiversity.

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DOI: 10.15560/17.3.783

Authors: Lauren N. Patterson, Susan R. Geda, Nathan A. Johnson

Abstract: Recent freshwater mussel research has resulted in rediscovery of several species presumed extinct. We report the rediscovery of Amblema plicata (Say, 1817) in 2019 from the Choctawhatchee River, Florida, USA. Amblema plicata has not been reported in the Choctawhatchee river basin since 1958, more than 61 years ago. This species was collected during the long-term monitoring of freshwater mussels in Florida streams. We provide genetic confirmation of our voucher identification using a DNA barcoding approach and discuss potential risks to A. plicata populations in the Choctawhatchee river basin.

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DOI: 10.15560/17.1.151

Authors: Manuella Feitosa Leal, Luiz Ricardo Lopes de Simone, Ana Carolina Figueiredo Lacerda, Edson Lourenço da Silva, Tamaris Gimenez Pinheiro

Abstract: Corbicula fluminea is an invasive clam originally from Asia that threatens the biodiversity of freshwater communities around the world. It has greatly expanded in Brazil since its first record. We report here the occurrence of C. fluminea from Piauí state, Parnaíba river basin and, provide an assessment of its current distribution in Brazil. The compiled data include 382 records in 22 states and the Federal District, encompassing a variety of ecosystems. These results contribute to a discussion about the invasion and expansion process of C. fluminea in Brazil over time.

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DOI: 10.15560/15.4.549

Authors: Bárbara Louise Valentas-Romera, Flávia Maria Pereira Costa, Ana Maria Setubal Pires-Vanin

Abstract: Guyanella clenchi (Altena, 1968) is newly reported from Abrolhos Bank, northeastern Brazil. The new records extend the distribution of this species to the Southern Atlantic and reinforce the known overlap between the Caribbean and South American marine faunas. Even though it inhabits well-sampled regions, G. clenchi is a poorly known species which is not well represented in collections. The new occurrence of the species in the Southern Atlantic draws attention to the necessity of further improvement in sampling strategies aimed at filling in the distribution gaps of species.

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DOI: 10.15560/2.2.41

Authors: Marcello Burns, Alexandre Garcia, Marlise Bemvenuti, João Vieira, David Marques, Alex Moresco, Mario Condini

Abstract: None

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