New insights into Diplogastrellus Paramonov, 1952 (Nematoda: Rhabditida: Diplogastroidea) with three novel and three known species from India

  • Sabia Mumtaz Section of Nematology, Department of Zoology, Aligarh Muslim University, Aligarh 202002, India
  • Ishrat Bashir Section of Nematology, Department of Zoology, Aligarh Muslim University, Aligarh 202002, India
  • Irfan Ahmad Section of Nematology, Department of Zoology, Aligarh Muslim University, Aligarh 202002, India https://orcid.org/0000-0002-7736-4393
  • Qudsia Tahseen Section of Nematology, Department of Zoology, Aligarh Muslim University, Aligarh 202002, India https://orcid.org/0000-0002-4047-7052
DOI: https://doi.org/10.5852/ejt.2025.1008.3019
Keywords: description, Diplogastrellus, morphology, new species, SEM, taxonomy

Abstract

Three new and three known species of the genus Diplogastrellus Paramonov, 1952 are described and illustrated from India. Diplogastrellus didelphis sp. nov. is characterised by a narrow stoma; a medium-sized dorsal tooth with ventrally directed apex; an oblong median bulb, a small pyriform basal bulb; an amphidelphic reproductive system; a large uterine pouch; ventrally arcuate spicules with a 90º curvature; a stout gubernaculum, proximally notched with a long dorsal arm, distally with a sleeve and nine pairs of genital papillae. Diplogastrellus longipharyngis sp. nov. is characterised by a short tubular stoma; a medium-sized ventrally directed dorsal tooth; an ovoid median bulb and a long isthmus; heavily cuticularized almost straight spicules; a keel-like triangular gubernaculum proximally notched, a caudal margin interrupted and nine pairs of genital papillae. Diplogastrellus robustus sp. nov. is characterised by a medium-sized dorsal tooth with a ventrally directed apex; an ovoid median bulb; a mono-prodelphic or amphidelphic reproductive system; robust spicules, with a blunt distal tip; a boat-shaped gubernaculum with a prominent distal sleeve and nine pairs of genital papillae. Three known species, viz., D. gracilis, D. graciloides and D. monhysteroides are redescribed/illustrated with emended diagnosis and SEM details. The comparative analysis of morphometrics and morphological traits as well as cladogram based on morphological characters are provided besides their biogeographic distribution.

References

Ahmad I., Mahamood M. & Shah A.A. 2005. Nematodes of the order Rhabditida from India. Description of a new and a known species of Diplogastrellus (Diplogastridae). Journal of Nematode Morphology and Systematics 7: 159–168.

Andrássy I. 1984. Klasse Nematoda. Gustav Fischer Verlag, Stuttgart. https://doi.org/10.1515/9783112484586

Andrássy I. 1986. Fifteen new nematode species from the southern hemisphere. Acta Zoologica Academiae Scientiarum Hungaricae 32: 1–33.

Andrássy. I. 2005. Free-living nematodes of Hungary, I. (Nematoda, errantia). In: Csuzdi C. & Mahunka S. (eds) Pedozoologica Hungarica 3. Hungarian Natural History Museum & Systematic Zoology Research Group of the Hungarian Academy of Sciences, Budapest.

Burdine L.W., Moczek A.P. & Rohner P.T. 2024. Sexually transmitted mutualist nematodes shape host growth across dung beetle species. Ecology and Evolution 14: e11089. https://doi.org/10.1002/ece3.11089

Bütschli O. 1874. Zur Kenntniss der freilebenden Nematoden insbesondere der des Keiler Hafens. Abhandlungen der Senckenbergischen naturforschenden Gesellschaft 9: 1–56. Available from https://www.biodiversitylibrary.org/page/31871165 [accessed 15 Jul. 2025].

Bütschli O. 1876. Untersuchungen über freilebende Nematoden und die Gattung Chaetonotus. Zeitschrift für wissenschaftliche Zoologie 26: 363–413. Available from https://www.biodiversitylibrary.org/page/42527603 [accessed 15 Jul. 2025].

Carus J.V. 1857. Icones zootomicae. Die wirbellosen Thiere, Erste Hälfte. W. Engelmann, Leipzig. https://doi.org/10.5962/bhl.title.60650

Chitwood B.G. 1933. A revised classification of the Nematoda. Journal of Parasitology 20: 131.

Cobb N.A. 1918. Estimating the nematode population of soil. Agricultural Technical Circular – 1 Bureau of Plant Industry. US Department of Agriculture.

Dassonville A.F. & Heyns J. 1984. Freshwater nematodes from South Africa. 7. New and known species collected in Skinnerspruit, Pretoria. Phytophylactica 16: 15–32.

De Maeseneer J. & d’Herde J. 1963. Méthodes utilisées pour l’étude des anguillules libres du sol. Revue d’Agriculture 16: 441–447.

Goodey T. 1929. On some new and little-known free-living nematodes. Journal of Helminthology 7: 27–62. https://doi.org/10.1017/S0022149X0001871X

Inglis W.G. 1983. An outline classification of the phylum Nematoda. Australian Journal of Zoology 31: 243–255. https://doi.org/10.1071/ZO9830243

Kanzaki N., Giblin-Davis R.M., Zeng Y., Ye W. & Center B.J. 2008. Diplogastrellus metamasius n. sp. (Rhabditida: Diplogastridae) isolated from Metamasius hemipterus (L.) (Coleoptera: Dryophthoridae) in southern Florida and Costa Rica. Nematology 10: 853–868. https://doi.org/10.1163/156854108786161409

Khan R., Bajaj H.K., Sultana R. & Tahseen Q. 2008. Descriptions of Diplogastrellus gracilis (Bütschli, 1876) Paramonov, 1952, D. sikorai sp. n. and Fictor composticola sp. n. (Nematoda: Diplogastrina) from India. Nematology 10: 153–166. https://doi.org/10.1163/156854108783476377

Kiontke K. & Sudhaus W. 1996. Diplogaster (Diplogastrellus) cerea sp. n. from Saguaro cactus rot and a revision of the subgenus Diplogastrellus (Nematoda: Diplogastridae). Nematologica 42: 173–197. https://doi.org/10.1163/004325996X00039

Ledón-Rettig C.C., Moczek A.P. & Ragsdale E.J. 2018. Diplogastrellus nematodes are sexually transmitted mutualists that alter the bacterial and fungal communities of their beetle host. Proceedings of the National Academy of Sciences 115: 1–6. https://doi.org/10.1073/pnas.1809606115

Mahamood M., Li Q., Keshari A. & Liang W. 2015. Descriptions of Diphtherophora chinensis sp. n., Aphelenchoides brevicauda sp. n. and Diplogastrellus latigubernacula sp. n. International Journal of Nematology 25: 90–95.

Meyl A.H. 1960. Die Freilebenden Erd- und Süßwassernematoden (Fadenwürmer). In: Brohmer P., Ehrmann P. & Ulmer G. (eds) Die Tierwelt Mitteleuropas Vol. 1 (5a): 1–164. Quelle & Meyer, Leipzig.

Micoletzky H. 1922. Die freilebenden Erd-Nematoden mit besonderer Berücksichtigung der Steiermark und der Bukowina, zugleich mit einer Revision sämtlicher nichtmariner, freilebender Nematoden in Form von Genus-Beschreibungen und Bestimmungsschlüsseln. Archiv für Naturgeschichte 87: 1–650.

Paesler F. 1946. Beitrag zur Kenntnis der im Dünger Bucht. Kieler Meeresforschungen 1: 1–48.

Paramonov A.A. 1952. Opyt ekologicheskoi klassificatsii fitonematod. [Ecological classification of plant nematodes.] Trudy Zoologiceskogo Instituta Academia Nauk SSSR (Moskva) 6: 338–369.

Rahm G.F. 1928. Alguns nematodes parasitas e semiparasitas das plantas culturaes do Brasil. Archivos do Instituto Biológico de Defesa Agricola e Animal (São Paulo) 1: 239–251.

Seinhorst J.W. 1959. A rapid method for the transfer of nematodes from fixative to anhydrous glycerin. Nematologica 4: 67–69. https://doi.org/10.1163/187529259X00381

Skwarra R.J. 1921. Diagnosen neuer freilebender Nematoden Ostpreußens. Zoologischer Anzeiger 53: 66–74. Available from https://www.biodiversitylibrary.org/page/29985230 [accessed 15 Jul. 2025].

Steiner G. 1914. Freilebende Nematoden aus der Schweiz. 2. Teil. Archiv für Hydrobiologie 9: 420–438.

Sudhaus W. & Fürst von Lieven A. 2003. A phylogenetic classification and catalogue of the Diplogastridae (Secernentea, Nematoda). Journal of Nematode Morphology and Systematics 6: 43–90.

Suryawanshi M.V. 1971. Alirhabditis indica n. gen., n. sp. (Rhabditida: Alirhabditidae n. fam.). Tawdenema indicum n. gen., n. sp. and Syedella aurangabadensis n. gen., n. sp. (Diplogastridae) from Marathwada, India. Nematologica 17: 542–552. https://doi.org/10.1163/187529271X00260

Swofford D.L. 2002. PAUP: Phylogenetic Analysis Using Parsimony (and other methods), Version 4.0 Beta 10. Sinauer Associates, Sunderland.

Timm R.W. 1961. Five species of Diplogaster (Nematoda, Diplogastridae) from East Pakistan. Pakistan Journal of Biology and Agricultural Science 4: 1–6.

Weingärtner I. 1955. Versuch einer Neuordnung der Gattung Diplogaster Schulze 1857 (Nematoda). Zoologische Jahrbücher. Abteilung für Systematik 83: 248–317.

Published
2025-08-20
How to Cite
Mumtaz, S., Bashir, I., Ahmad, I., & Tahseen, Q. (2025). New insights into Diplogastrellus Paramonov, 1952 (Nematoda: Rhabditida: Diplogastroidea) with three novel and three known species from India. European Journal of Taxonomy, 1008(1), 1–50. https://doi.org/10.5852/ejt.2025.1008.3019
Issue
Vol. 1008 (2025)
Section
Monograph

Copyright (c) 2025 Sabia Mumtaz, Ishrat Bashir, Irfan Ahmad, Qudsia Tahseen

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