New data on two remarkable Antarctic species Amblydorylaimus isokaryon (Loof, 1975) Andrássy, 1998 and Pararhyssocolpus paradoxus (Loof, 1975), gen. n., comb. n. (Nematoda, Dorylaimida)

Elshishka, Milka; Lazarova, Stela; Radoslavov, Georgi; Hristov, Peter; Peneva, Vlada

doi:10.3897/zookeys.511.9793

Cited by 8 publications

(6 citation statements)

References 42 publications

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“…DNA data have been generated for 11 species, but sequences for only three of them ( Amblydorylaimus isokaryon ( Loof 1975 ), P. paradoxus and E. signyensis ) are supported by full morphological descriptions as per the modern taxonomic standards ( Elshishka et al 2015b , Elshishka et al 2017 , Kagoshima et al 2019 ).…”

Section: Resultsmentioning

confidence: 99%

“…Studies that include molecular data for the nematodes in the Maritime Antarctic are too rare to provide valuable information regarding nematode diversity, phylogenetics and endemism ( Elshishka et al 2015b , Elshishka et al 2017 , Kagoshima et al 2019 ). The taxonomic position of only three Antarctic dorylaimid species, A.…”

Section: Discussionmentioning

confidence: 99%

“…This resulted in a description of the first Antarctic nematode species, Mononchus gerlachei (= Coomansus gerlachei ( de Man 1904 ) Jairajpuri and Khan 1977 ), followed by three other species, Plectus antarcticus de Man 1904 , P. belgicae de Man 1904 and Dorylaimus sp. Following these first data, targeted investigations on the terrestrial nematode fauna from this part of Antarctica started from the early 70s of the 20 th century ( Spaull 1972 , Spaull 1973a , Spaull 1973b , Spaull 1973c , Loof 1975 , Maslen 1979a , Maslen 1979b , Caldwell 1981 , Maslen 1981 , Spaull 1981 , Pickup 1988 , Shishida and Ohyama 1989 , Tsalolikhin 1989 , Pickup 1990 , Janiec 1996 , Peneva et al 1996 , Andrássy 1998 , Peneva and Chipev 1999 , Convey et al 2000 , Nedelchev and Peneva 2000 , Peneva et al 2002 , Convey and Wynn-Williams 2002 , Holovachov and Bostrom 2006 , Maslen and Convey 2006 , Nedelchev and Peneva 2007 , Kito 2009 , Peneva et al 2009 , Nielsen et al 2011b , Velasco-Castrillón and Stevens 2014 , Velasco-Castrillón et al 2014a , Russell et al 2014 , Elshishka et al 2015a , Elshishka et al 2015b , Elshishka et al 2017 , Kagoshima et al 2019 , Newsham et al 2020 ). Antarctic nematodes have been studied mainly in easy to access areas near to the research bases/stations; therefore, there are still many remote locations never sampled for nematodes which raise questions on how widespread the species are (…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, molecular studies have become more important in these marginal habitats, as a powerful toolkit to complement the traditional taxonomy, species identification and descriptions and to assess biodiversity and biogeography ( Courtright et al 2000 , Velasco-Castrillón et al 2014b , Elshishka et al 2015b , Elshishka et al 2017 , Czechowski et al 2017 , Velasco-Castrillón et al 2018 , Kagoshima et al 2019 ).…”

Section: Introductionmentioning

confidence: 99%

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Terrestrial nematodes from the Maritime Antarctic

Elshishka,

Mladenov,

Lazarova

et al. 2023

BDJ

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Soil nematodes are one of the most important terrestrial faunal groups in Antarctica, as they are a major component of soil micro-food webs. Despite their crucial role in soil processes, knowledge of their species diversity and distribution is still incomplete. Taxonomic studies of Antarctic nematodes are fragmented, which prevents assessment of the degree of endemicity and distribution of the species, as well as other aspects of biogeography. The present study is focused on the nematode fauna of one of the three Antarctic sub-regions, the Maritime Antarctic and summarises all findings published up to April 2023. A species list that includes 44 species, belonging to 21 genera, 16 families and eight orders is provided. A review of the literature on terrestrial nematodes inhabiting the Maritime Antarctic showed that the sites are unevenly studied. Three islands (Signy, King George and Livingston Islands) revealed highest species richness, probably due to the highest rates of research effort. Most species and four genera (Antarctenchus, Pararhyssocolpus, Amblydorylaimus and Enchodeloides) are endemic, proving that nematode fauna of the Maritime Antarctic is autochthonous and unique. Several groups of islands/sites have been revealed, based on their nematode fauna. The study showed that species with a limited distribution prevailed, while only two species (Plectus antarcticus and Coomansus gerlachei) have been found in more than 50% of the sites. Based on the literature data, details on species localities, microhabitat distribution, plant associations and availability of DNA sequences are provided.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Terrestrial nematodes from the Maritime Antarctic

Elshishka,

Mladenov,

Lazarova

et al. 2023

BDJ

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“…Regarding Coomansus 25 de Mayo, a 100% bootstrap value was obtained for the clade formed by three sequences of the species Coomansus gerlachei (KM092523; LC457639/LC457655) cited by Elshishka et al (2015) and Kagoshima et al (2019), respectively. This genus of predatory nematodes was found only at the sites furthest away from the pristine zone, at points PZ1 and PZ2.…”

Section: Discussionmentioning

confidence: 99%

Diversity and abundance of free-living nematodes from Carlini station, Isla 25 de Mayo/King George Island, Antarctica: A case study in pristine and disturbed soils

Salas

Fusaro

Rusconi

et al. 2023

Preprint

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This study describes the soil nematodes of King George Island (Isla 25 de Mayo) in Antarctica through molecular identification, abundance, and structure analysis. Nematodes are key organisms in terrestrial ecosystems, with important roles in nutrient cycling and trophic networks. Despite the harsh conditions in the extreme environment of Antarctica, these organisms have managed to adapt and survive. Soil samples were collected from pristine and disturbed areas, and morphological and molecular analyses were conducted to identify the nematode species present. Abundance, trophic groups, maturity indices, and colonizer-persister values (cp) were analyzed and compared between the sampling sites. The molecular results revealed four genera of Antarctic nematodes (Coomansus, Calcaridorylaimus, Eudorylaimus, and Plectus), and the phylogenetic relationships of these nematodes with others found in Antarctica were established. ANOSIM and SIMPER statistical analysis showed significant differences in nematode abundance between pristine and disturbed areas. The analysis of the nematode assemblage through MI, EI, and SI showed less disturbance at the pristine sites than at the anthropic sites. Further studies should be carried out at the Carlini Station and 25 de Mayo/King George Island to learn more about the structure of the nematode community and how they are affected by anthropic practices in Antarctic environments.

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Morphological and molecular characterization ofLenonchium zanjanensesp. n. (Dorylaimida, Nordiidae) from Iran, with new insights into the phylogeny of the genus and a revision of its taxonomy

et al. 2019

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The new species Lenonchium zanjanense sp. n. is described from a natural habitat of Zanjan province, Iran, including line, light microscopy and scanning electron microscopy illustrations and a molecular (18S, 28S) study. It is characterized by its 3.50–4.51 mm long body, rounded lip region, continuous and 13.5–15.5 µm broad, odontostyle 21–24 µm long, neck 362–490 µm long, double guiding ring, pharyngeal expansion 190–285 µm long, female genital system didelphic–amphidelphic, uterus simple and 185–320 µm long or 3.4–5.9 times the corresponding body diameter, vulva nearly equatorial (V = 45–53), tail conical-elongated to filiform (90–165 µm, c = 23–43, c′ = 2.4–5.3) with three or four mucro-like projections at the tip, spicules 58–64 µm long and 16–21 contiguous ventromedian supplements ending at the level of the anterior end of the spicules. The taxonomy of the genus is updated, with an emended diagnosis, list of species, key to their identification and a compendium of their main morphometrics. Lenonchium asterocaudatum is regarded as identical and a junior synonym of L. denticaudatum. New insights into the phylogeny of the group are also provided, and the classification of Lenonchium within Nordiidae is seriously questioned.

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New data on two remarkable Antarctic species Amblydorylaimus isokaryon (Loof, 1975) Andrássy, 1998 and Pararhyssocolpus paradoxus (Loof, 1975), gen. n., comb. n. (Nematoda, Dorylaimida)

Cited by 8 publications

References 42 publications

Terrestrial nematodes from the Maritime Antarctic

Terrestrial nematodes from the Maritime Antarctic

Diversity and abundance of free-living nematodes from Carlini station, Isla 25 de Mayo/King George Island, Antarctica: A case study in pristine and disturbed soils

Morphological and molecular characterization ofLenonchium zanjanensesp. n. (Dorylaimida, Nordiidae) from Iran, with new insights into the phylogeny of the genus and a revision of its taxonomy

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