Diversity of Monogenoidea parasitizing scombrid fishes from Rio de Janeiro coast, Brazil

Justo, Márcia Cristina Nascimento; Kohn, Anna

doi:10.15560/11.3.1628

Cited by 7 publications

(5 citation statements)

References 19 publications

(24 reference statements)

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“…The families with the highest number of reports are Diclidophoridae and Monocotylidae in osteichthyan and chondrichthyan hosts, respectively. The Atlantic Ocean exhibited the major number of HPAs (67%) compared to Pacific waters, these results are mainly due the numerous studies on marine teleost as hosts from the Brazilian coastal zone (Luque & Poulin, 2007; Justo & Kohn, 2015).…”

Section: Taxonomy and Systematics Of The Helminths Parasitic In Fish mentioning

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: Taxonomy and Systematics Of The Helminths Parasitic In Fish mentioning

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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“…Based on previous descriptions and figures, although some authors failed to determine the number of testes in their descriptions, the number of testes in Neohexostoma is usually less than 50 and testes are arranged in two or three alternating rows [9,27,34,35]. Abundant testes (185-246 in our new species) are usually seen in some species of Hexostoma, such as H. grossum, H. sibi, and H. dissimile [14,29,33,34]. Moreover, the terminal portion of the vagina in members of the Hexostomatidae is typically represented by two symmetrical pads with densely conical spines forming two serrated edges, which is dissimilar to that in our species.…”

Section: Discussionmentioning

confidence: 85%

Neohexostoma gymnosardaen. sp. (Monogenea, Hexostomatidae), a gill parasite ofGymnosarda unicolor(Valenciennes) (Teleostei, Scombridae) in the South China Sea

Zhu

et al. 2020

Parasite

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Parasite biodiversity of fish in coral reefs of the South China Sea is still incompletely explored. We describe here a new species of Neohexostoma (Monogenea: Hexostomatidae) from the gill filaments of the dogtooth tuna Gymnosarda unicolor (Scombridae), collected off Yongshu Reef, South China Sea. Neohexostoma gymnosardae n. sp. is distinguished from its congeners by the following features: (i) haptor clearly marked from body proper by a strongly constricted peduncle, divided in its posterior margin into two symmetrical lobes, (ii) vagina armed with scattered small blunt spines, (iii) eggs tied by their long polar filaments, (vi) esophagus with several lateral diverticula, (v) intestinal ceca unfused and extending into the haptor. We present an analysis of the relationships of this monogenean based on partial 28S rDNA sequences. An identification key for species of Neohexostoma is provided. This is the first member of the genus Neohexostoma known to parasitize a species of Gymnosarda.

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“…Probably for the same reason, several parasites observed in tunas from the western Atlantic Ocean, including E. alletteratus, were not found in the Mediterranean Sea: i.e. Capsala maccallumi, Hexostoma lintoni, Udonella caligorum, Sibitrema poonoui and Unicolax anonymus (Alves and Luque, 2006;Justo and Kohn, 2015;Mele et al 2015). Morphological and genetic analyses of the didymozoid trematodes revealed the presence of four species that had not been previously described in E. alletteratus.…”

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Ecology of the Atlantic black skipjack Euthynnus alletteratus (Osteichthyes: Scombridae) in the western Mediterranean Sea inferred by parasitological analysis

et al. 2016

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Between 2008 and 2011, the head of 150 Euthynnus alletteratus (Osteichthyes: Scombridae) caught inshore off the southeastern Iberian coast (western Mediterranean Sea) were examined for parasites. Two monogeneans, four didymozoid trematodes and four copepods were found. Parasite abundance showed a positive relationship with the annual sea surface temperature, except for Pseudocycnus appendiculatus, but negative with the sea depth (Capsala manteri, Neonematobothrium cf. kawakawa and Caligus bonito). Prevalences and mean abundances differed significantly among sampling areas, except for C. manteri, Oesophagocystis sp. 2 and Ceratocolax euthynni, and sampling years (Melanocystis cf. kawakawa, N.cf. kawakawa, P. appendiculatus and Unicolax collateralis). Results indicate that the parasite abundances of E. alletteratus in the western Mediterranean Sea depend mainly on regional environmental variables, which can show interannual variations. The presence of pelagic parasites, i.e. didymozoids and P. appendiculatus, could indicate that E. alletteratus migrates between inshore and offshore pelagic domains. The different parasite faunas reported in E. alletteratus populations from the western Atlantic Ocean and the Mediterranean Sea appear to point out the geographical host isolation. These results suggest that E. alletteratus inhabiting the western Mediterranean Sea performs inshore-offshore small-scale migrations, and not transoceanic migrations between the western Atlantic Ocean and Mediterranean Sea.

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Diversity of Monogenoidea parasitizing scombrid fishes from Rio de Janeiro coast, Brazil

Cited by 7 publications

References 19 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

Neohexostoma gymnosardaen. sp. (Monogenea, Hexostomatidae), a gill parasite ofGymnosarda unicolor(Valenciennes) (Teleostei, Scombridae) in the South China Sea

Ecology of the Atlantic black skipjack Euthynnus alletteratus (Osteichthyes: Scombridae) in the western Mediterranean Sea inferred by parasitological analysis

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