Morphometry of mountain crabs (Crustacea: Decapoda: Brachyura: Potamidae) from Phetchabun Mountains Thailand

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Wanniwat suthamrit
Bungorn Thaewnon-ngiw


Mountain crabs are freshwater crabs which live in high mountain streams. They are an important food source for local villagers, but some species are threatened with extinction. The aims of this study was to collect and identify mountain crabs of family Potamidae using external morphology, and morphometric analysis. A total of 138 crabs (103 males and 35 females) were collected from 15 locations of the Phetchabun Mountains (310 to 845 meters above sea level). The morphological crab was classified based on gonopod and other characters. This study identified six species: Indochinamon bhumibol, Indochinamon ahkense, Indochinamon mieni, Iomon nan, Vietopotamon phuluangense and Larnaudia chaiyaphumi. All species showed relationship between the carapace width and weight, indicating that they maintain the same shape throughout life, making identification more difficult. The variety of morphological characteristics presents a challenge in the identification. I. bhumibol's the first gonopod is extreme like other species and has high variation coloration. Therefore, taxonomists need to search for other characters and techniques for classification. It is suggested that species of crabs facing extinction be selectively propagated incapacity for release back into the wild.

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suthamrit, W., & Thaewnon-ngiw, B. . (2020). Morphometry of mountain crabs (Crustacea: Decapoda: Brachyura: Potamidae) from Phetchabun Mountains Thailand. Interdisciplinary Research Review, 15(2), 24–31. Retrieved from
Research Articles


D. C. J. Yeo, P. K. L. Ng, On the genus ``Potamon" and allies in Indochina (Crustacea: Decapoda: Brachyura: Potamidae), The Raffles Bulletin of Zoology 16(2) (2008) 273 -- 308.

S. Potamidae, #794--Family: Potamidae, 2010 (accessed 12 August 2019).

S. Buatip, P. Yeesin, S. Samaae, Some aspects of the biology of 5 freshwater crabs in lower Southern Part of Thailand, Burapha Science Journal 23(1) (2017) 431--47.

M. Dobson, A. M. Magana, J. Lancaster, J. M. Mathooko, Aseasonality in the abundance and life history of an ecologically dominant freshwater crab in the Rift Valley, Kenya Freshwater Biology 52(2) (2007) 215--25.

N. Cumberlidge, P. K. L. Ng, D. C. J. Yeo, Freshwater crabs of the Indo-Burma hotspot: diversity, distribution, and conservation, status Distrib Freshw crabs (2011) 102--13.

Department of Mineral Resources, Thai Geological SiteThe Invaluable Natural HeritageThai, php?filename=index_EN, 2017 [accessed 16 December 2019)

K. Thawarorit, N. Sangpradub, J. C. Morse, Five new species of the genus cheumatopsyche (Trichoptera: Hydropsychidae) from the Phetchabun Mountains, Thailand, Zootaxa 3613(5) (2013) 445--54.

C. Chuensri, Freshwater Crabs of Thailand, Freshwater Crabs of Thailand, 1973, pp. 18--20.

D. C. J. Yeo, P. K. L. Ng, N. Cumberlidge, C. Magalhaes, S. R. Daniels, M. R. Campos, Global diversity of crabs (Crustacea: Decapoda: Brachyura) in freshwater, Hydrobiologia 595(1) (2008) 275--86.

P. K. L. Ng, P. Naiyanetr, Pudaengon, a new genus of terrestrial crabs (Crustacea: Decapoda: Brachyura: Potamidae) from Thailand and Laos, with descriptions of seven new species, The Raffles Bulletin of Zoology 43(2) (1995) 355--376.

P. Ng, P. Naiyanetr. Zoologische Verhandelingen: new and recently described freshwater crabs (Crustacea:Decapoda:Brachyura:Potamidea,Gecarcinucidae and Parathelphusidae) from Thailand, 2003, pp. 1--117.

T. Pramual, Taxonomy of rice-field crabs and charaters of Gonopod ommatidia by scanning electron microscopy, Chulalongkorn university, 1990.

D. Brandis, The taxonomical status of the freshwater crab genus, Senckenbergiana Biologica (2000) 57--100.

S. Supajantra, Taxonomy of freshwater crabs in The North-Eastern Thailand, Chulalongkorn university, 2002.

P. Ng, D. Guinot, P. Davie, Systema Brachyurorum: Part 1. An Annotated checklist of extant brachyuran crabs of the world, The Raffles Bulletin of Zoology 17 (2008):1--286.

T. Naruse, J. E. Chia, X. Zhou, Biodiversity surveys reveal eight new species of freshwater crabs (Decapoda: Brachyura: Potamidae) from Yunnan Province, China. PeerJ. 6(d) (2018) e5497.

D. A. Somerton, A computer technique for estimating the size of sexual maturity in crabs, Canadian Journal of Fisheries and Aquatic Sciences 37(10) (1980) 1488--94.

A. Kalate, A. Keikhosravi, R. Naderloo, T. Hajjar, C. D. Schubart, Morphometric characterization of the freshwater crab Potamon elbursi Pretzmann, 1962 in the Caspian Sea and Namak Lake hydrographic systems, Journal of Crustacean Biology 38(1) (2018) 91--100.

S. Fadlaoui, M. Mahjoub, O. El Asri, M. Melhaoui, Allometric growth of the freshwater crab Potamon algeriense (Bott, 1967) (Decapoda, Brachyura, Potamidae) in Oued Zegzel, a Mountain Stream, in the Northeast of Morocco, International Journal of Zoology 2019(1) (2019) 1--8.

K. Malila, Provenance of the Nam Duk formation and implications for the Geodynamic, Technology, Suranaree University of Technology, 2005.

P. Naiyanetr, Potamon bhumiboln. sp., A newgaint freshwater crab from Thailand (Decapoda, Brachyura, Potamidae), Crustaceana 65(1) (1993) 1--7.

H. T. Shih, H. C. Hung, C. D. Schubart, C. A. Chen, H. W. Chang, Intraspecific genetic diversity of the endemic freshwater crab Candidiopotamon rathbunae (Decapoda, Brachyura, Potamidae) reflects five million years of the geological history of Taiwan, Journal of Biogeography 33(6) (2006) 980--989.

C. D. Schubart, J. Reimer, R. Diesel, M. T$ddot{rm u} $rkay, Taxonomy and ecology of two endemic freshwater crabs from western jamaica with the description of a new sesarma species (Brachyura: Grapsidae: Sesarminae), Journal of Natural History 31(3) (1997) 403--419.

M. Rueda, M. A. Rodr$acute{rm i} $guez, B. A. Hawkins, Identifying global zoogeographical regions: Lessons from Wallace, Journal of Biogeography 40(12) (2013) 2215--2225.

IUCN. The IUCN red list of threatened species,, 2019.

Royal Forest Department. Forest Area in 1973 -- 2018,, 2018

V. T. Do, Freshwater crabs of Vietnam: diversity and conservation, Journal of Vietnamese Environment 6(2) (2014) 109--114.

R. C. Akpaniteaku, Evaluation of the strategy of utilization and conservation of freshwater crab, International Journal of Innovative Studies in Aquatic Biology and Fisheries 3(2) (2017) 18--22.

T. Dalu, M. T. B. Sachikonye, M. E. Alexander, T. Dube, W. P. Froneman, K. I. Manungo, et al., Ecological assessment of two species of potamonautid freshwater crabs from the Eastern Highlands of Zimbabwe, with implications for their conservation, PLoS One. 11(1) (2016) 1--17.

D. P. Matondo, C. G. Demayo, Morphological description of the red frog crab Ranina ranina Linnaeus, 1758 (Brachyura: Raninidae) from South Western Mindanao, Philippines 3(2) (2015) 251--256.

S. R. Daniels, B. A. Stewart, L. Burmeister, Geographic patterns of genetic and morphological divergence amongst populations of a river crab (Decapoda, Potamonautidae) with the description of a new species from mountain streams in the Western Cape, South Africa, Zoologica Scripta 30(3) (2001) 181--197.

H. Nagasawa, The crustacean cuticle: Structure, composition and mineralization, 2015.

D. Osorio, M. Vorobyev, A review of the evolution of animal colour vision and visual communication signals, Vision Research 48(20) (2008) 2042--2051.

A. D. Briscoe, L. Chittka, The evolution of color vision in insects, Annual Review of Entomology 446(1) (2001) 471--510.

W. Siriwut, G. D. Edgecombe, C. Sutcharit, S. Panha, The centipede genus Scolopendra in mainland Southeast Asia: Molecular phylogenetics, geometric morphometrics and external morphology as tools for species delimitation, PLoS One 10(8) (2015) 1--37.

P. Klahan, B. Thaewnon-ngiw, Genetic diversity of the grass frog (Fejervarya limnocharis , Gravenhorst, 1829) in northeastern Thailand using PCR-RFLP, Journal of Thai Interdisciplinary Research 13(1) (2018) 1--7.

B. G. Miner, S. E. Sultan, S. G. Morgan, D. K. Padilla, R. A. Relyea, Ecological consequences of phenotypic plasticity, Trends in Ecology & Evolution 20(12) (2005) 685--692.