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Issue: Vol. 5642 No. 5: 3 Jun. 2025
Type: Article
Published: 2025-06-03
DOI: 10.11646/zootaxa.5642.5.4
Page range: 476-484
Abstract views: 85
PDF downloaded: 3

Description of a new species of Pilarta Bahir & Yeo, 2007 (Crustacea: Brachyura: Gecarcinucidae) from the Southern Western Ghats, Kerala, India

Department of Aquatic Biology and Fisheries; University of Kerala; Thiruvananthapuram – 695581; Kerala; India; Wildlife Information Liaison Development; 12 Thiruvannamalai Nagar; Saravanampatti-Kalapatti Road; Saravanampatti; Coimbatore Tamil Nadu 641035; India; Travancore Nature History Society; MBRRA 65; Jyothis; Mathrubumi Road; Vanchiyoor; Trivandrum; India
Department of Aquatic Biology and Fisheries; University of Kerala; Thiruvananthapuram – 695581; Kerala; India
Lee Kong Chian Natural History Museum; National University of Singapore; 2 Conservatory Drive; Singapore 117377; Republic of Singapore
Crustacea Gecarcinucoidea Pilarta vaman taxonomy new taxon comparative morphology

Abstract

A new species of gecarcinucid freshwater crab Pilarta vaman sp. nov. is described from Gavi, Southern Western Ghats, Kerala, Southern India. The new species differs from P. anuka Bahir & Yeo, 2007, by its more quadrate carapace with an extremely shallow cervical groove that is almost undiscernible, as well as the proportionately longer terminal article and more convex outer margins of the subterminal article of the male first gonopod; from P. aroma Pati, Rajesh, Raj, Sheeja, Kumar & Sureshan, 2017, by its low subtruncate inner angle of the carpus of the cheliped, and the narrower proximal part of the subterminal article and shape of the terminal article of the male first gonopod; and from P. punctatissima Pati, Rajesh, Raj, Sheeja, Kumar & Sureshan, 2017, by the carapace and the surfaces of the chela being weakly punctate, the male pleonal somite 6 has the lateral margins gently concave and the overall male first gonopod being more elongate.

 

References

  1. Alves, D.F.R., Martinez, P.A., Magalhaes, C., Barros‑Alves, S.D.P., Almeida, A.C.D. & Amado, T.F. (2024) Global patterns and predictors of primary freshwater crab richness across taxa and realms. Hydrobiologia, 2024, 1–17. https://doi.org/10.1007/s10750-024-05572-9
  2. Bahir, M.M. & Yeo, D.C.J. (2007) The gecarcinucid freshwater crabs of southern India (Crustacea: Decapoda: Brachyura). Raffles Bulletin of Zoology, Supplement 16, 309–354.
  3. Davie, P.J.F., Guinot, D. & Ng, P.K.L. (2015) Anatomy and functional morphology of Brachyura. In: Castro, P., Davie, P.J.F., Guinot, D., Schram, F.R. & von Vaupel Klein, J.C. (Eds.), Treatise on Zoology—Anatomy, Taxonomy, Biology. The Crustacea. Vol. 9C-I. Decapoda: Brachyura. Part 1. Brill, Leiden, pp. 11–163. https://doi.org/10.1163/9789004190832_004
  4. Gunawardene, N.R., Daniels, A.E.D., Gunatilleke, I.A.U.N., Gunatilleke, C.V.S., Karunakaran, P.V., Geetha, K.G., Prasad, S., Puyravaud, P., Ramesh, B.R., Subramanian, K. & Vasanthy, G. (2007) A brief overview of the Western Ghats—Sri Lanka biodiversity hotspot. Current Science, 93, 1567–1572.
  5. Maenosono, T. & Naruse, T. (2016) New records of two sesarmid crabs (Crustacea: Decapoda: Brachyura) from Ishigakijima Island, Ryukyu Archipelago, Japan. Fauna Ryukyuana, 28, 5–22. [in Japanese]
  6. Myers, N., Mittermeier, R.A., Mittermeier, C.G., da Fonseca, G.A.B. & Kent, J. (2000) Biodiversity hotspots for conservation priorities. Nature, 403, 853–858. https://doi.org/10.1038/35002501
  7. Ng, P.K.L. (1988) The freshwater crabs of Peninsular Malaysia and Singapore. Department of Zoology, National University of Singapore and Shinglee Press, Singapore, 156 pp.
  8. Pati, S.K., Bajantri, P.P. & Hegde, G.D. (2023a) A new freshwater crab species of the genus Vela Bahir & Yeo, 2007 (Decapoda: Brachyura: Gecarcinucidae) from the Western Ghats of Karnataka, India. Zootaxa, 5239 (1), 112–126. https://doi.org/10.11646/zootaxa.5239.1.5
  9. Pati, S.K., Bajantri, P.P. & Hegde, G.D. (2023b) A new genus and new species of freshwater crab (Decapoda: Brachyura: Gecarcinucidae) from the Central Western Ghats of India. Zootaxa, 5285 (1), 161–175. https://doi.org/10.11646/zootaxa.5285.1.7
  10. Pati, S.K., Bajantri, P.P. & Hegde, G.D. (2024) The “Mr. and Mrs. Ghat crab”, Ghatiana dvirupa sp. nov. (Decapoda: Brachyura: Gecarcinucidae) from the Central Western Ghats of India. Zootaxa, 5443 (1), 116–126. https://doi.org/10.11646/zootaxa.5443.1.6
  11. Pati, S.K. & Pradhan, R.N. (2020) An overview of the freshwater crabs (Brachyura: Gecarcinucidae) of the Western Ghats, India. Oceanography & Fisheries Open Access Journal, 12, 555836. https://doi.org/10.19080/OFOAJ.2020.12.555836
  12. Pati, S.K., Rajesh, L., Raj, R., Sheeja, V.U., Kumar, A.B. & Sureshan, P.M. (2017) Karkata, a new genus of gecarcinucid freshwater crab with two new species, and four new species of Pilarta Bahir and Yeo, 2007 and Cylindrotelphusa Alcock, 1909 (Decapoda: Brachyura) from Kerala, India. Journal of Natural History, 51 (23–24), 1295–1330. https://doi.org/10.1080/00222933.2017.1324054
  13. Pati, S.K. & Thackeray, T. (2021) Five new species of freshwater crabs of the genera Ghatiana Pati & Sharma, 2014 and Sahyadriana Pati & Thackeray, 2018 from India (Decapoda: Brachyura: Gecarcinucidae). Zoosystema, 43, 627–647. https://doi.org/10.5252/zoosystema2021v43a26
  14. Pati, S.K., Thackeray, T., Bajantri, P.P. & Hegde, G.D. (2022) A new species of the freshwater crab genus Ghatiana Pati and Sharma, 2014 (Brachyura: Gecarcinucidae) from the Central Western Ghats, India. Nauplius, 30, e2022019. https://doi.org/10.1590/2358-2936e2022019
  15. Pati, S.K., Thackeray, T. & Pawar, S. (2023c) Ghatiana sanguinolenta, a new species of freshwater crab (Brachyura: Gecarcinucidae) from the Central Western Ghats of India. Zootaxa, 5353 (4), 372–378. https://doi.org/10.11646/zootaxa.5353.4.4
  16. Pati, S.K. & Yeo, D.C.J. (2022) A taxonomic revision of the freshwater crab genus Barytelphusa Alcock, 1909 (Decapoda: Brachyura: Gecarcinucidae), with descriptions of a new genus and three new species. Journal of Crustacean Biology, 42, 1–27. https://doi.org/10.1093/jcbiol/ruab083
  17. Raghavan, R., Das, S., Nameer, P.O., Bijukumar, A. & Dahanukar, N. (2016) Protected areas and imperilled endemic freshwater biodiversity in the Western Ghats Hotspot. Aquatic Conservation: Marine and Freshwater Ecosystems, 26, 78–90. https://doi.org/10.1002/aqc.2653
  18. Raj, S., Kumar, A.B. & Ng, P.K.L. (2021) Description of a new genus and two new species of freshwater crab (Decapoda: Brachyura: Gecarcinucidae) from the southwestern Ghats, India. Zoological Studies, 60, 14. https://doi.org/10.6620/ZS.2021.60-14
  19. Raj, S., Kumar, A.B. & Ng, P.K.L. (2022) New genus and two new species of semiterrestrial crabs (Decapoda: Brachyura: Gecarcinucidae) from the southern Western Ghats, India. Zoological Studies, 61, 49. https://doi.org/10.6620/ZS.2022.61–49
  20. Rathbun, M.J. (1904) Les crabes d’eau douce (Potamonidae). Nouvelles Archives du Muséum d’Historie naturelle, Series 4, 6, 225–312.
  21. Sidharthan, A., Raghavan, R., Anoop, V.K., Philip, S. & Dahanukar, N. (2020) Riddle on the riffle: Miocene diversification and biogeography of endemic mountain loaches in the Western Ghats Biodiversity Hotspot. Journal of Biogeography, 47, 2741–2754. https://doi.org/10.1111/jbi.13972

How to Cite

Raj, S., Kumar, A.B. & Ng, P.K.L. (2025) Description of a new species of Pilarta Bahir & Yeo, 2007 (Crustacea: Brachyura: Gecarcinucidae) from the Southern Western Ghats, Kerala, India. Zootaxa, 5642 (5), 476–484. https://doi.org/10.11646/zootaxa.5642.5.4