Zoological Studies

Vol. 61, 2022

(update: 2022.6.28)

New Genus and Two New Species of Semiterrestrial Crabs (Decapoda: Brachyura: Gecarcinucidae) from the Southern Western Ghats, India

Smrithy Raj1,2,3,*, Appukuttannair Biju Kumar1, and Peter K. L. Ng4

1Department of Aquatic Biology and Fisheries, University of Kerala, Thiruvananthapuram – 695581, Kerala, India. *Correspondence: E-mail: smrithyaqb@gmail.com (Raj).
E-mail: bijupuzhayoram@gmail.com (Kumar)
2National Centre for Biological Sciences, Tata Institute of Fundamental Research, GKVK Campus, Bellary Road, Bangalore 560065, Karnataka, India
3Wildlife Information Liaison Development, 12 Thiruvannamalai Nagar, Saravanampatti-Kalapatti Road, Saravanampatti, Coimbatore Tamil Nadu 641035, India
4Lee Kong Chian Natural History Museum, National University of Singapore, 2 Conservatory Drive, Singapore 117377, Republic of Singapore. E-mail: peterng@nus.edu.sg (Ng)

Received 25 November 2021 / Accepted 5 June 2022
Communicated by Benny K.K. Chan

One new genus and two new species of semiterrestrial freshwater crabs are described from the Western Ghats mountain range in India: Pavizham gavi gen., sp. nov. and Rajathelphusa brunnea sp. nov. The carapace of Pavizham n. gen. is superficially similar to Baratha and Snaha described from the same region; but it can be distinguished from Baratha in having no visible postorbital cristae, the sutures between male thoracic sternites 2 and 3 being complete, the possession of a triangular male pleon and the elongate terminal segment of the male first gonopod; and from Snaha by the presence of a long flagellum on the exopod of the third maxilliped, a complete suture separating male thoracic sternites 2 and 3, and its triangular male pleon. Rajathelphusa brunnea sp. nov. can easily be distinguished from congeners in possessing a distinctly more slender and elongate male first gonopod.

Key words: Pavizham, Rajathelphusa, Taxonomy, Kerala, Freshwater crab, Indian subcontinent, Biodiversity.

Citation: Raj S, Kumar AB, Ng PKL. 2022. New genus and two new species of semiterrestrial crabs (Decapoda: Brachyura: Gecarcinucidae) from the southern Western Ghats, India. Zool Stud 61:49.