Contact Information:

Department of Biological Sciences
National University of Singapore
14 Science Drive 4
Singapore 117543

6601 1091
6779 2486

Academic Qualifications

Ph.D., B.Sc. (N.U.S.)

Teaching Areas


LSM1103 – Biodiversity
LSM4262 – Tropical Conservation Biology
LSM4263 – Field Studies in Biodiversity
SSS1207 – Natural Heritage of Singapore
GEK15XX – Darwin and Evolution


GEK1542 – Forensic Science
SP3202 – Evidence in Forensic Science
Teachers’ Workshop

Undergraduate Research

Sound production in mangrove crabs, crab larval development and gastric mill morphology of brachyuran crabs.

Research Interest

Systematics and taxonomy of crabs from the superfamily Graposidea (Crustacea: Decapoda: Brachyura); larval development studies, biology and distribution of grapsoid crabs, and biology and distribution of crabs from extreme environment like shallow water hydrothermal vents, mountains and caves.

Current Projects

For my thesis, I worked on the systematics of the crab from the family Varunidae. I am trying to publish the various revisions I have made in my thesis. Beside the morphological studies, I am working with international colleagues on the molecular phylogeny of selected genera of crabs from the family Varunidae. The larval development studies of the varunid crabs are also being studied. I am also working on the diversity and taxonomy of selected groups of marine brachyuran crabs. The studies on the gastric mills structures of grapsoid crabs, some of the marine and freshwater crabs are also being carried out.

Additional Research Interests

I have also previously worked on caridean shrimps from the genus Caridina very briefly. Currently, I am also looking into the systematics of the hermit crabs from the genus Parugus.

Additional Activities

Honorary Treasurer, Singapore Institute of Biology Bulletin (2008-present)
Research Associate, Raffles Museum of Biodiversity Research

Selected Publications

  1. N.K. Ng, 2010. A new species of varunid crab from Cebu Island, Philippines (Crustcea: Decapoda: Brachyura: Vaunidae). Crustaceana (The Netherlands) (In press)

  2. Ng, N.K & J. Martin, 2010. Two new species of grapsoid crabs of the genus Euchirograpsus (Decapoda: Brachuyra: Grapsoidea: Plagusiidae) from the Philippines and the Hawaiian Islands. Crustaceana. (The Netherlands) (In press).

  3. Ng, N.K., T. Komai, & P.K.L. Ng, 2009. Otognathon uru, a new species of crabs (Brachyura, Varunidae) from coral reefs in Okinawa Island, The Ryukyus, Japan. Bulletin of the National Museum of Natural Sciences, Series A (Japan) (In press).

  4. Hsueh, Pan-Wen, N.K. Ng, & P.K.L. Ng, 2009. New records of pilumnid and xanthid crabs from rocky coasts of Taiwan. Crustaceana, 82 (8): 1023-1028

  5. N.K. Ng, Pan-Wen Hsueh & P.K.L. Ng, 2009. Oreolatus latus (Borradaile, 1903), a new record for Taiwan, with the first description of a male and a revised key to the genus (Brachyura, Leucosiidae). Crustaceana (In press).

  6. Ng, N.K. & P.K.L. Ng, 2009. Orcovita holthuisii, a new species of anchialine crab (Brachyura, Varunidae) from the Coron Islands, Palawan, Philippines. Crustaceana (In press).

  7. Ng, N.K., P.J.F. Davie, C.D. Schubart & P.K.L. Ng, 2007. Xenograpsidae, a new family of grapsoid crabs (Crustacea: Brachyura) associated with shallow water hydrothermal vents. The Raffles Bulletin of Zoology, Supplement No. 16: 233-256.

  8. Davie, P.J.F., & N.K. Ng, 2007. Two new subfamilies of Varuninae (Crustacea: Brachyura), with description of two new genera. The Raffles Bulletin of Zoology, Supplement No 16: 257-272.

  9. Ng, N.K. & P.K.L. Ng, 2007. Cancer setosus Fabricius, 1798 (currently Pseudograpsus setosus; Crustacea, Decapoda): proposed replacement of a syntype by a neotype. Bulletin of Zoological Nomenclature, 64(3): 149-154.

  10. Ng, N.K., S. Yang & P.K.L. Ng, 2007. In memoriam Dai Ai-Yun (A.Y. Dai) (1930-2005). Crustaceana, 81(1): 109-118.

  11. Ng, N.K. & M. Segonzac, 2006. Arthropoda, Crustacea, Decapoda, Brachyura, Grapsidae. Denisia, 18: 474.

  12. Osawa, M. & N.K. Ng, 2006. A new species of Ptychognathus Stimpson, 1858 (Crustacea: Decapoda: Brachyura: Varunidae) from the Ryukyu Islands, southwestern Japan. Zootaxa, 1260: 56-66.

  13. Ng, N.K., M. R. Manuel & P. K. L. Ng. 2006. A new genus of varunid crabs from the Philippines (Crustacea: Decapoda: Grapsidae). Proceedings of the Biological Society of Washington, 119 (1): 49-57.

  14. Chan, T.-Y., P.K.L. Ng & N.K. Ng, 2005. The nomenclature and taxonomy of Eriocheir formosa Chan, Hung and Yu, 1995 (Brachyura, Varunidae) from Taiwan: A rebuttal of Tang et al. (2003, 2004). Crustaceanea, 78(4): 457-464.

  15. Jeng, M.-S., N.K. Ng, & P.K.L. Ng. 2004. Hydrothermal vent crabs feeds on ‘marine snow’. Nature (United Kingdom), 432: 969.

  16. Ng, N.K. & P.K.L. Ng, 2002. Orcovita mcneiceae, a new species of anchialine crab (Bachyura: Grapsidae: Varuninae) from the Loyalty Islands. Crustaceanea, 75(5): 663-670.

  17. Ng, N.K. & M. S. Jeng, 2002. On the taxonomy of Pseudograpsus setosus (Fabricius, 1778) (Decapoda, Brachyura, Grapsidae). Crustaceana, 75(6): 759-776.

  18. Ng, N.K. & T. Komai. 2000. Notes on the male of Scutumara enodis Ng & Nakasone, 1993 (Crustacea: Decapoda: Brachyura: Grapsidae). Proceedings of the Biological Society of Washington, 113 (1): 48-53.

  19. Ng, N.K., J. Guo, & P.K.L. Ng, 1999. On the generic affinities of Eriocheir leptognathus Rathbun, 1913, and Eriocheir formosa Chan, Hung and Yu, 1995, with description of a new genus (Crustacea: Grapsidae: Varuninae). Journal of Crustacean Biology, 19(1): 154-170.

  20. Cai, Y., & N.K. Ng, 1999. A revision of the Caridina serrata species group, with descriptions of five new species (Crustacea: Decapoda: Caridea: Atyidae). Journal of Natural History, 33: 1603-1638.

  21. Ng, N.K., A.Y. Dai, J. Guo & P.K.L. Ng, 1998. Complete larval development of Eriocheir hepuensis Dai, 1991 reared in the laboratory. (Crustacea: Decapoda: Brachyura: Grapsidae). Crustaceana, 71 (5): 493-517.

  22. Guo, J. N.K. Ng, A.Y. Dai & P.K.L.Ng, 1997. The taxonomy of three commercially important species of mitten crabs of the genus Eriocheir De Haan, 1835 (Crustacea: Decapoda: Brachyura: Grapsidae). The Raffles Bulletin of Zoology, 45(2): 445-476.