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Description of Pseudocapillaria (Discocapillaria) trilobularis n. sp. (Capillariidae) and redescription of Heliconema alatum (Majumdar, 1965) (Physalopteridae), two nematodes parasitising synbranchiform fishes in India

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Abstract

One new and one already known species of nematodes are described based on specimens collected from synbranchiform fishes of the River Ganga, India, in 2021 and 2022. Pseudocapillaria (Discocapillaria) trilobularis n. sp. (Capillariidae) from the intestine of cuchia Monopterus cuchia (Hamilton) (Synbranchidae) is mainly characterised by the presence of the large ventral postcloacal lobe in the male, the spicule length 351 µm, eggs size 60–69 × 30–36 µm (with protruding polar plugs) and by the body length (male 10.50 mm, females 11.02–12.44 mm). It is the fourth species of this genus recorded from fishes in India. The species Heliconema alatum (Majumdar, 1965) (Physalopteridae) is resurrected. This nematode is redescribed from specimens collected from the intestine of zig-zag eel Mastacembelus armatus (Lacepède) (Mastacembelidae). The examination by SEM revealed some previously not reported morphological features in this nematode species, e.g., the presence of cephalic papillae or a lateroterminal depression and two inner flat dorsoventral teeth on each pseudolabium. Based on these findings, H. monopteri Moravec, Chaudhary & Singh, 2019 is considered a junior synonym of H. alatum.

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Data Availability

All samples used in this study have been deposited in the relevant curated, internationally recognised museum collection as outlined in this paper.

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Acknowledgements

We thank the Department of Zoology, Chaudhary Charan Singh University, Meerut, India for providing laboratory facilities. Thanks are also due to the Laboratory of Electron Microscopy, Institute of Parasitology, Biology Centre CAS, institution supported by the MEYS CR (LM2015062 Czech-BioImaging) and ERDF (No. CZ.02.1.01/0.0/0.0/16_013/0001775), for their support in obtaining the scientific data presented in this paper, and to Blanka Škoríková of the same Institute for help with the illustrations. SS is thankful to Council of Scientific and Industrial Research, New Delhi [F.No. 08/062(0019)/2020-EMR-I] for JRF grant and YK thanks are also due to the Research and Development Scheme of Higher Education Department, Uttar Pradesh Government, India [No. 93/2021/1401/sattar-4-2021-4(28)/2021].

Funding

This study was partly supported by the institutional support of the Institute of Parasitology, Biology Centre of the Czech Academy of Sciences (RVO: 60077344 awarded to FM).

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Authors and Affiliations

  1. Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, 370 05, České Budějovice, Czech Republic

    František Moravec

  2. Molecular Taxonomy Laboratory, Department of Zoology, Chaudhary Charan Singh University, Meerut, Uttar Pradesh, 25004, India

    Anshu Chaudhary

  3. Department of Zoology, D.A.V. College, Muzaffarnagar, Uttar Pradesh, 251001, India

    Deepa Kashyap & Yougesh Kumar

  4. Department of Zoology, Meerut College, Meerut, Uttar Pradesh, 250003, India

    Suhani Singh

Authors
  1. František Moravec
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  2. Anshu Chaudhary
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  3. Deepa Kashyap
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  4. Suhani Singh
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  5. Yougesh Kumar
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Contributions

Anshu Chaudhary, Deepa Kashyap and Suhani Singh obtained the samples and undertook the processing for morphological identification of the nematodes. František Moravec carried out the identification and morphological analysis, and drafted the manuscript. Yougesh Kumar conceived and coordinated the study. František Moravec and Anshu Chaudhary discussed the results and helped draft the manuscript. All authors read and approved the final manuscript.

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Correspondence to František Moravec.

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František Moravec is a member of the Editorial Board of Systematic Parasitology.

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This article was registered in the Official Register of Zoological Nomenclature (ZooBank) as: urn:lsid:zoobank.org:pub:0E903307-9AB8-4926-A19C-DC76D278CFE4. This article was published as an Online First article on the online publication date shown on this paper. The article should be cited by using the doi number. This is the Version of Record.

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Moravec, F., Chaudhary, A., Kashyap, D. et al. Description of Pseudocapillaria (Discocapillaria) trilobularis n. sp. (Capillariidae) and redescription of Heliconema alatum (Majumdar, 1965) (Physalopteridae), two nematodes parasitising synbranchiform fishes in India. Syst Parasitol 99, 647–657 (2022). https://doi.org/10.1007/s11230-022-10053-5

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