Diversity of scorpions (Arachnida: Scorpiones) in Polonnaruwa Archaeological Reserve, Sri Lanka

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Kumudu B. Wijesooriya
Lakshani S. Weerasekara
Kithsiri B. Ranawana


Sri Lanka harbours 20 scorpion species belonging to four families, of which 15 are endemic.  The distribution and ecology of scorpion fauna in Sri Lanka is poorly known.  In this study, we surveyed the diversity of scorpions in the Polonnaruwa Archaeological Reserve in the dry zone of Sri Lanka.  Microhabitats were thoroughly observed using the direct visual encounter method and UV lights from July to November 2018 for about seven hours (19.00–02.00 h) by two to three observers.  Species, abundance, age/sex, and microhabitat features were recorded.  Diversity indices, including α-diversity and β-diversity, were calculated. Heterometrus swammerdami was the most abundant species recorded, while Isometrus thwaitesi was the rarest.  Reddyanus loebli and R. besucheti were common in both open and forest habitat types.  Charmus laneus was recorded for the first time in Polonnaruwa.  The highest Shannon Index and Margalef Diversity Index values were recorded in open habitats, but species evenness was low compared to forest habitats.  Sørensen index values showed a 58% species similarity between two habitats.  The results presented here contribute to the knowledge of the diversity of scorpions in these historically significant sites.  This can serve as a basis for future research on the impact of habitat modification and fragmentation on populations, distribution and ecology of scorpions.

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How to Cite
Wijesooriya, K.B., Weerasekara, L.S. and Ranawana, K.B. 2020. Diversity of scorpions (Arachnida: Scorpiones) in Polonnaruwa Archaeological Reserve, Sri Lanka. Journal of Threatened Taxa. 12, 15 (Nov. 2020), 17121–17128. DOI:https://doi.org/10.11609/jott.6238.12.15.17121-17128.
Author Biographies

Lakshani S. Weerasekara, Department of Zoology, Faculty of Science, Eastern University, Sri Lanka.

Lecturer (Probationary) in Zoology, Department of Zoology, Eastern University Sri Lanka.

Kithsiri B. Ranawana, Department of Zoology, Faculty of Science, University of Peradeniya, Sri Lanka.

Senior Professor in Zoology, Department of Zoology, Faculty of Science, University of Peradeniya


Abeynayake, K., R.N. de Fonseka & R. Sandhya (1993). A Survey of the vegetation of Damila Mahasaya in Polonnaruwa. Journal of the Royal Asiatic Society of Sri Lanka 38: 127–140.

Ashton, M.S., S. Gunatilleke, N. de Zoysa, M.D. Dassanayake, N. Gunatilleke & S. Wijesundera (1997). A Field Guide to the Common Trees and Shrubs of Sri Lanka. Wildlife Heritage Trust Publications (Pvt.) Ltd, Colombo, 430pp.

Bahir, M.M., P.K.L. Ng, K. Crandall & R. Pethiyagoda (2005). A conservation assessment of the freshwater crabs of Sri Lanka. The Raffles Bulletin of Zoology 12: 121–126.

Bedjanič, M. (2004). Odonata fauna of Sri Lanka: Research state and threat status. International Journal of Odonatology 7(2): 279–294. https://doi.org/10.1080/13887890.2004.9748216

Fernando, P., J. Jayewardene, T. Prasad, W. Hendavitharana & J. Pastorini (2011). Current status of Asian elephants in Sri Lanka. Gajah 35: 93–103. https://doi.org/10.18987/jjwrs.37.0_37

Help, C.H.R., P.M.J. Herman & K. Soetaert (1998). Indices of diversity and evenness. Oceanis 24: 61–87.

Kaltsas, D., I. Stathi & M. Mylonas (2009). Intraspecific differentiation of social behavior and shelter selection in Mesobuthus gibbosus (Brullé, 1832) (Scorpiones: Buthidae). Journal of Ethology 27: 467–473. https://doi.org/10.1007/s10164-008-0144-6

Karunaratne, I.W.A.P. & J.P. Edirisinghe (2008). Keys for the identification of common bees of Sri Lanka. Journal of the National Science Foundation of Sri Lanka 36(1): 69–89. https://doi.org/10.4038/jnsfsr.v36i1.134

Kempton, R. (1979). The Structure of Species Abundance and Measurement of Diversity. Biometrics 35: 307–321.

Kittle, A.M., A.C. Watson & T.S.P. Fernando (2017). The ecology and behaviour of a protected area Sri Lankan leopard (Panthera pardus kotiya) population. Tropical Ecology 58(1): 71–86.

Kovařík, F., G. Lowe, K.B. Ranawana, D. Hoferek, V.A.S. Jayarathne, J. Plíšková & F. Šťáhlavský (2016). Scorpions of Sri Lanka (Scorpiones: Buthidae, Chaerilidae, Scorpionidae) with description of four new species of the genera Charmus Karsch, 1879 and Reddyanus Vachon, 1972, stat. n. Euscorpius 220: 1–133.

Kovařík, F., K.B. Ranawana, V.A.S. Jayarathne, D. Hoferek & f. Šťáhlavský (2019). Scorpions of Sri Lanka (Arachnida: Scorpiones). Part III. Heterometrus yaleensis sp. n. (Scorpionidae). Euscorpius 283: 1–13.

Kovařík, F., K.B. Ranawana, V.A.S. Jayarathne, S. Karunarathna & A. Ullrich (2018). Scorpions of Sri Lanka (Arachnida: Scorpiones). Part II. family Hormuridae Euscorpius 258: 1-8. http://www.science.marshall.edu/fet/euscorpius/example.pdf

Kularatne, S.A.M., N.P. Dinamithra, S. Sivansuthan, K.G.A.D. Weerakoon, B.Thillaimpalam, V. Kalyanasundram & K.B. Ranawana (2015). Clinico-epidemiology of stings and envenoming of Hottentotta tamulus (Scorpiones: Buthidae), the Indian red scorpion from Jaffna Peninsula in northern Sri Lanka. Toxicon 93: 85–89. https://doi.org/10.1016/j.toxicon.2014.11.225

Lira, A.F.A., A.M. Souza, A.A.C. Silva Filho & C.M.R. Albuquerque (2013). Spatio-temporal microhabitat use by two co-occurring species of scorpions in Atlantic rainforest in Brazil. Zoology 116: 182–185. https://doi.org/10.1016/j.zool.2013.01.002

Lloyd, M. & R.J. Ghelardi (1964). A table for calculating theequitability’component of species diversity. The Journal of Animal Ecology 33: 217-225pp. https://doi.org/10.2307/2628

Lourenço, W.R. (2002). Further taxonomic considerations about the genus Charmus Karsch, 1879 (Scorpiones, Buthidae), with the description of a new species from Sri Lanka. Entomologische Mitteilungen aus dem Zoologischen Museum Hamburg 14(165): 17–25.

Magurran, A.E. (1988). Ecological Diversity and its Measurement. Princeton University Press, London, 168pp.

Magurran, A.E. (2004). Measuring Biologica Diversity. Blackwell Publishing, Victoria, 256pp.

Mayer, P. (2000). Hot Spot: Forest policy in Europe: achievements of the MCPFE and challenges ahead. Forest Policy and Economics 1: 177–185. https://doi.org/10.1016/s1389-9341(00)00018-6

Mittermeier, R.A., W.R. Turner, F.W. Larsen, T.M. Brooks & C. Gascon (2011). Global Biodiversity Conservation: The Critical Role of Hotspots, pp. 3–22. In: Zachos, F. & J. Habel (eds.). Biodiversity Hotspots. Springer, Berlin, Heidelberg, 565pp. https://doi.org/10.1007/978-3-642-20992-5

Naggs, F., D. Raheem, K.B. Ranawana & Y. Mapatuna (2005). The darwin initiative project on Sri Lankan land snails : patterns of diversity in Sri Lankan forests. The Raffles Bulletin of Zoology 12: 23–29.

Newlands, G. (1972). Ecological adaptations of Kruger National Park scorpionids (Arachnida: Scorpionides). Koedoe 15: 37–48. https://doi.org/10.4102/koedoe.v15i1.666

Nijman, V. (2012). Purple-faced langurs in human-modified environments feeding on cultivated fruits: a comment to Dela (2007, 2012). International Journal of Primatology 33: 743–748. https://doi.org/10.1007/s10764-012-9609-0

Nime, M.F., F. Casanoves, D.E. Vrech & C.I. Mattoni (2013). Relationship between environmental variables and surface activity of scorpions in the Arid Chaco ecoregion of Argentina. Invertebrate Biology 132(2): 1–11. https://doi.org/10.1111/ivb.12019

Pande, S., D. Bastawade, A. Padhye & A. Pawashe (2012). Diversity of scorpion fauna of Saswad-Jejuri, Pune District, Maharashtra, western India. Journal of Threatened Taxa 4(2): 2381–2389. https://doi.org/10.11609/jott.o2910.2381-9

Pande, S., A. Pawashe, D.B. Bastawade & P.P. Kulkarni (2004). Scorpions and molluscs: Some new dietary records for Spotted Owlet Athene brama in India. Newsletter for Ornithologists 1(5): 68–70.

Prendini, L. (2005). Scorpion diversity and distribution in southern Africa: Pattern and process, pp. 25–68. In: Huber, B.A., B.J. Sinclair & K.-H. Lampe (eds.) African Biodiversity: Molecules, Organisms, Ecosystems. Proceedings of the 5th International Symposium on Tropical Biology, Museum Alexander Koenig, Bonn. Springer, Verlag, New York, 68pp.

Polis, G.A. (1990). Life history. The Biology of Scorpions. Stanford University Press, Stanford, 293pp.

Ranawana, K.B., N.P. Dinamithra, S. Sivansuthan, I.I. Nagasena, F. Kovařík & S.A.M. Kularatne (2013). First report on Hottentotta tamulus (Scorpiones: Buthidae) from Sri Lanka, and its medical importance. Euscorpius 155: 1–10. https://doi.org/10.18590/euscorpius.2013.vol2013.iss155.1

Samarawckrama, V.A.M.P.K., M.D.B.G. Janananda, K.B. Ranawana & A. Smith (2005). Study of the distribution of the Genus Poecilotheria of the Family Theraphosidae in Sri Lanka. Ceylone Journal of Science 34: 75–86.

Shehab, A.H., Z.S. Amr & J.A. Lindsell (2011). Ecology and biology of scorpions in Palmyra, Syria. Turkish Journal of Zoology 35(3): 333–341. https://doi.org/10.3906/zoo-0904-19

van der Poorten, G.M. & N.E. van der Poorten (2016). The Butterfly Fauna of Sri Lanka. Lepodon Books, Torronto, 418pp.

Warburg, M.R. (2000). Intra- and interspecific cohabitation of scorpions in the field and the effect of density, food, and shelter on their interactions. Journal of Ethology 18: 59–63. https://doi.org/10.1007/s101640070026