A new sexually dimorphic species of Pirnodus (Acari, Oribatida, Oripodidae) associated with trees in southern Vietnam

Ermilov, Sergey G.; Salavatulin, Vladimir M.; Kontschan, Jeno

doi:10.22073/pja.v15i1.87782

A new sexually dimorphic species of Pirnodus (Acari, Oribatida, Oripodidae) associated with trees in southern Vietnam

Authors

Sergey G. Ermilov ¹

Vladimir M. Salavatulin ¹

Jeno Kontschan ²

¹ University of Tyumen, X-BIO Institute, Tyumen, Russia

² Plant Protection Institute, HUN-REN Centre for Agricultural Research, Budapest, Hungary

https://doi.org/10.22073/pja.v15i1.87782

Abstract

Pirnodus (Oribatida, Oripodidae) currently comprises seven species, collectively distributed in the tropical and southern Palaearctic areas. A new arboreal species – P. arboreus sp. nov. – is described, based on adults collected from branches of different trees in the Cat Tien National Park, southern Vietnam. The new species is characterized by distinct sexual dimorphism, e.g., interlamellar seta long, setiform in females versus medium-sized, phylliform in males, posterior part of notogaster not depressed in females versus depressed in males, notogastral seta h₁ well developed, setiform in females versus vestigial in males, notogastral seta lm located medial to la in females versus anteromedial in males, genital and anal apertures distanced from each other in females versus genital aperture shifted to anal aperture and connected to it in males, and dorsal side of tarsi I and II without tooth in females versus with tooth in males. Summary of distribution and habitats of the known species of Pirnodus are provided.

Keywords

Arboreal habitat

morphology

Oriental region

oripodid mites

sexual dimorphism

taxonomy

Balogh, J. & Mahunka, S. (1968) The scientific results of the Hungarian soil zoological expeditions to South America. 5. Acari: Data to the oribatid fauna of the environment of Córdoba, Argentina. Opuscula Zoologica Budapest, 8: 317–340.

Balogh, J. & Mahunka, S. (1978) Data to the Oribatid fauna of Australia (Acari), I. Opuscula Zoologica Budapest, 15: 31–49.

Bayartogtokh, B., Ermilov, S.G. & Corpuz-Raros, L. (2017) An interesting sexually dimorphic species, Neoribates isabelaensis sp. nov. (Acari, Oribatida, Parakalummidae) with remarks on sexual dimorphism in Oripodoidea. Zootaxa, 4347: 94–108. https://doi.org/10.11646/zootaxa.4347.1.5

Behan-Pelletier, V.M. (2015) Review of sexual dimorphism in the brachypyline oribatid mites. Acarologia, 55: 127–146. https://doi.org/10.1051/acarologia.20152163

Ermilov, S.G. & Salavatulin, V.M. (2023) New arboreal mite species of Oribatulidae and Oripodidae (Acari, Oribatida, Oripodoidea) from Vietnam. International Journal of Acarology, 49: 283–291.

https://doi.org/10.1080/01647954.2023.2244979

Ermilov, S.G. & Salavatulin, V.M. (2024) Contribution to knowledge of the oribatid mite genus Idiozetes (Acari, Oribatida, Idiozetidae), with description of a new sexually dimorphic species from Vietnam. Acarologia, 64: 768–776. https://doi.org/10.24349/2zt3-2r2t

Ermilov, S.G. & Salavatulin, V.M. (2025) New faunistic data on arboreal oribatid mites (Acari: Oribatida) of Vietnam. Acarina, 33: 3–7. https://doi.org/10.21684/0132-8077-2025-33-1-3-7

Ermilov, S.G., Salavatulin, V.M. & Kolesnikov, V.B. (2023) Contribution to knowledge of the oribatid mite genus Symbioribates (Acari, Oribatida, Symbioribatidae), with descriptions of two new arboreal species from Vietnam. Zootaxa, 5325: 556–570. https://doi.org/10.11646/zootaxa.5325.4.6

Ermilov, S.G., Salavatulin, V.M. & Kontschán, J. (2024) Three new species of oribatid mites of the superfamily Oripodoidea (Acari, Oribatida) from Vietnam. Zoologichesky Zhurnal, 103 : 3–13.

https://doi.org/10.31857/S0044513424020011

Ermilov, S.G., Khaustov, A.A., Joharchi, O., Döker, I. & Khaustov, V.A. (2022) A new sexually dimorphic species of the genus Oribatella (Acari, Oribatida, Oribatellidae) from Russia. Acta Zoologica Academiae Scientiarum Hungaricae, 68: 73–84. https://doi.org/10.17109/AZH.68.1.73.2022

Grandjean, F. (1956) Sur deux espéces nouvelles d'Oribates (Acariens) apparentées à Oripoda elongata Banks 1904. Archives de Zoologie experimentale et generale, 93: 185–218.

Mahunka, S. (1996) Oribatid mites (Acari: Oribatida) from Madagascar. II: Description of six new species. Folia Entomologica Hungarica, 57: 109–123.

Norton, R.A. (1977) A review of F. Grandjean's system of leg chaetotaxy in the Oribatei (Acari) and its application to the family Damaeidae. In: Dindal, D.L. (Ed.), Biology of oribatid mites. SUNY College of Environmental Science and Forestry, Syracuse, pp. 33–61.

Pfingstl, T., Hiruta, S.F., Bardel-Kahr, I., Obae, Y. & Shimano, S. (2022) Another mite species discovered via social media – Ameronothrus retweet sp. nov. (Acari, Oribatida) from Japanese coasts, exhibiting an interesting sexual dimorphism. International Journal of Acarology, 48: 348–358.

https://doi.org/10.1080/01647954.2022.2074538

Salavatulin, V.M. (2019) Microhabitat distribution of arboreal oribatid mites (Oribatida), associated with the Siberian pine (Pinus sibirica) of Western Siberia. Experimental and Applied Acarology, 78: 469–483. https://doi.org/10.1007/s10493-019-00401-4

Schatz, H. (1998) Oribatid mites (Acari: Oribatida) from the Galápagos Islands – Faunistics, Ecology and Speciation. Experimental and Applied Acarology, 22: 373–409.

Shimano, S. & Aoki, J. (2019) A new species of Japanese oribatid mite, Zachvatkinibates erimo sp. nov., showing sexual dimorphism (Acariformes: Oribatida: Punctoribatidae). Zootaxa, 4647: 362–367. https://doi.org/10.11646/zootaxa.4647.1.22

Subías, L.S. (1977) Taxonomía y ecología de los oribátidos saxícolas y arborícolas de la Sierra del Guadarrama (Acarida, Oribatida). Trabajos de la Cátedra de Artrópodos, Facultad de Biología, Universidad Complutense de Madrid, 24: 1–379.

Travé, J. (1959) Dimorphisme sexuel chez Pirnodus detectidens Grandjean (Acariens, Oribates). Notes écologiques et éthologiques. Vie et Milieu, 9: 454–468.

Travé, J. (1969a) Sur le peuplement des Lichens crustacés des Iles Salvages par les Oribates (Acariens). Revue d’Écologie et de Biologie du Sol, 6: 239–248.

Travé, J. (1969b) Un nouveau cas de dimorphisme sexuel dans le genre Pirnodus Grandjean (Acarien, Oribate). Revue d’Écologie et de Biologie du Sol, 6: 325–335.