Taxonomic status and redescription of the genus Brasicystis Thatcher, 1979 (Digenea: Didymozoidae)

Melo, Francisco Tiago de Vasconcelos; Silva, Jefferson Pereira e; Gonçalves, Evonnildo Costa; Furtado, Adriano Penha; Giese, Elane Guerreiro; Santos, Cláudia Portes; Santos, Jeannie Nascimento dos

doi:10.1016/j.parint.2013.01.001

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…Currently, Brazil includes the majority of the research groups in South America; they are distributed mainly in the north, south-east and south of the country. In the State of Pará, two groups have contributed mainly to helminth taxonomy, one resident in the UFPA, focusing on monogeneans (Branches & Domingues, 2014; Santos et al ., 2015), and the other in the UFRA, working on some other taxa (Melo et al ., 2013a, b) including the poorly known Aspidogastrea (Giese et al ., 2014). In the south-east, some groups belonging to three different institutions have contributed to taxonomic knowledge, as follows.…”

Section: Current Research Groups and Their Geographic Distributionmentioning

confidence: 99%

Helminth parasites of South American fishes: current status and characterization as a model for studies of biodiversity

et al. 2016

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The South American subcontinent supports one of the world's most diverse and commercially very important ichthyofauna. In this context, the study of South American fish parasites is of increased relevance in understanding their key roles in ecosystems, regulating the abundance or density of host populations, stabilizing food webs and structuring host communities. It is hard to estimate the number of fish parasites in South America. The number of fish species studied for parasites is still low (less than 10%), although the total number of host-parasite associations (HPAs) found in the present study was 3971. Monogeneans, with 835 species (1123 HPAs, 28.5%), and trematodes, with 662 species (1127 HPAs, 30.9%), are the more diverse groups. Data gathered from the literature are useful to roughly estimate species richness of helminths from South American fish, even though there are some associated problems: the reliability of information depends on accurate species identification; the lack of knowledge about life cycles; the increasing number of discoveries of cryptic species and the geographically biased number of studies. Therefore, the closest true estimations of species diversity and distribution will rely on further studies combining both molecular and morphological approaches with ecological data such as host specificity, geographical distribution and life-cycle data. Research on biodiversity of fish parasites in South America is influenced by problems such as funding, taxonomic impediments and dispersion of research groups. Increasing collaboration, interchange and research networks in the context of globalization will enable a promising future for fish parasitology in South America.

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Section: Current Research Groups and Their Geographic Distributionmentioning

confidence: 99%

Helminth parasites of South American fishes: current status and characterization as a model for studies of biodiversity

et al. 2016

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“…We added to our dataset cox1 sequences available on GenBank and BOLD Systems of Didymozoidae that parasitizing different host species to compare with the cox1 sequences of the Didymozoidae parasitizing heteropods and chaetognaths (Table S2). Three sequences of species of the genus Lecithaster Lühe, 1901 (Family Lecithasterinae Odhner, 1905) were selected as an outgroup based on a comprehensive phylogenetic study of Digenea (Pérez-Ponce de León and Hernández-Mena 2019) and one more of Brasicystis bennetti Thatcher, 1979 as other outgroup based on the common use of this didymozoid species in the DNA analyses with Kimura two-parameter (K2P) model (Melo et al 2013) as in this study. All sequences were aligned and the genetic distances among pairs of sequences were calculated using Kimura two-parameter model in the software PAUP* v.4.0 (Swofford 2002).…”

Section: Dna Analysismentioning

confidence: 99%

Finding a needle in a haystack: larval stages of Didymozoidae (Trematoda: Digenea) parasitizing marine zooplankton

et al. 2022

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Larval didymozoids (Trematoda, Digenea) were discovered parasitizing the hemocoel of the heteropod Firoloida desmarestia (redia mean intensity = 13) and the chaetognaths Flaccisagitta en ata and Flaccisagitta hexaptera (metacercaria mean intensity = 1) during a 2014-2016 systematic study of parasites of zooplankton collected in the central and southern regions of the Gulf of California, Mexico. Didymozoid infection route during the early life cycle was inferred combining morphological and molecular evidence (light and scanning electron microscopy and mitochondrial cytochrome c oxidase subunit I gene, cox1, respectively). Didymozoid rediae parasitizing F. desmarestia were observed alive releasing hundredths of cystophorous cercariae at a mean rate of one cercariae every 12 s. Cercariae developed into young metacercariae in 1 d at 22°C. Molecular analysis of cox1 showed that rediae found in F. desmarestia belong to two distinct didymozoid species (Didymozoidae sp. 1 and sp. 2). Metacercariae parasitizing chaetognaths were morphologically identi ed as Didymozoidae type Monilicaecum and cox1 sequences showed that metacercariae of chaetognaths matched with these two Didymozoidae sp.1, and sp. 2 species found parasitizing F. desmarestia, plus a third distinct Didymozoidae sp. 3. These are the rst DNA sequences of cox1 gene from didymozoid larvae for any zooplankton taxonomic group in the world. We concluded that F. desmarestia is the rst intermediate host of rediae and second intermediate host cercariae and chaetognaths are the third intermediate hosts of didymozoid metacercariae demonstrating a potential overlap distribution of these two carnivorous zooplankton taxonomic groups. The didymozoid specimens were not identi ed to species level because any of the cox1 sequences generated here matched with the sequences of adult didymozoids currently available in GenBank and Bold System databases. This study provides valuable information for the morphological and molecular understanding of the Didymozoidae larvae that has been previously based on the recognition of the 12 known morphotypes.

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Hemiuroidean trematodes from freshwater Patagonian fishes: description of a new species, distribution and molecular phylogeny

et al. 2021

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Taxonomic status and redescription of the genus Brasicystis Thatcher, 1979 (Digenea: Didymozoidae)

Cited by 6 publications

References 6 publications

Helminth parasites of South American fishes: current status and characterization as a model for studies of biodiversity

Helminth parasites of South American fishes: current status and characterization as a model for studies of biodiversity

Finding a needle in a haystack: larval stages of Didymozoidae (Trematoda: Digenea) parasitizing marine zooplankton

Hemiuroidean trematodes from freshwater Patagonian fishes: description of a new species, distribution and molecular phylogeny

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