The Wallacean island of Timor is of particular biological interest due to its relatively large size and transitional location between the Indo-Malayan and Australasian biogeographic realms. However, the origins and levels of endemism of its invertebrate fauna are poorly known. A recent study of Timorese ants revealed a diverse fauna with predominantly Indo-Malayan affinities, but species-level taxonomy was considered to be too poorly understood for an analysis of levels of endemism. The highly diverse Old World tropical genus Polyrhachis represents a notable exception, and here we analyse levels of endemism in the Polyrhachis fauna of Timor and surrounding islands. We supplement the species listed in the previous study with additional collections to record a total of 35 species of Polyrhachis from Timor and surrounding islands. Only 14 (40%) of the 35 species could be named ( P. constricta, P. costulata, P. gab, P. sokolova, P. hera, P. illaudata, P. rixosa, P. acantha chrysophanes, P. saevissima, P. bicolor, P. cryptoceroides, P. dives, P. longipes and P. olybria), and the large majority of the remaining species have not previously been collected. These are very likely to be endemic to Timor and surrounding islands, and point to remarkably high levels (>50%) of endemism in the regional ant fauna.
References
[1]
Wallace, A.R. The Malay Archipelago; Tynron Press: Stenhouse, Scotland, 1869.
[2]
Van Oosterzee, P. Where Worlds Collide: The Wallace Line; Cornell University Press: Ithaca, NY, USA, 1997.
[3]
Lohman, D.J.; de Bruyn, M.; Page, T.; von Rintelen, K.; Hall, R.; Ng, P.K.L.; Shih, H.-T.; Carvalho, G.R.; von Rintelen, T. Biogeography of the Indo-Australian Archipelago. Ann. Rev. Ecol. Evol. Syst. 2011, 42, 205–226, doi:10.1146/annurev-ecolsys-102710-145001.
[4]
Holloway, J.D.; Jardine, N. Two approaches to zoogeography: A study based on the distributions of butterflies, birds and bats in the Indo-Australian area. Proc. Lin. Soc. Lond. 1968, 179, 153–188, doi:10.1111/j.1095-8312.1968.tb00975.x.
[5]
How, R.A.; Kitchener, D.J. Biogeography of Indonesian snakes. J. Biogeogr. 1997, 24, 725–735.
[6]
Clode, D.; O’Brien, R. Why Wallace Drew the Line: A Reanalysis of Wallace’s Bird Collections in the Malay Archipelago and the Origins of Biogeography. In Faunal and Floral Migrations and Evolution in SE Asia–Australasia; Metcalfe, I., Smith, J.M.B., Morwood, M., Davidson, I., Eds.; AA Balkema Publishers: Tokyo, Japan, 2001; pp. 313–321.
[7]
Inger, R.F.; Voris, H.K. The biogeographical relations of the frogs and snakes of Sundaland. J. Biogeogr. 2001, 28, 863–891, doi:10.1046/j.1365-2699.2001.00580.x.
[8]
How, R.A.; Schmitt, L.H.; Suyanto, A. Geographical variation in the morphology of four snake species from the Lesser Sunda Islands, eastern Indonesia. Biol. J. Lin. Soc. 1996, 59, 439–456.
[9]
J？nsson, K.A.; Irestedt, M.; Fuchs, J.; Ericson, P.G.P.; Christidis, L.; Bowie, R.C.K.; Norman, J.A.; Pasquet, E.; Fjelds？, J. Explosive avian radiations and multi-directional dispersal across Wallacea: Evidence from the Campephagidae and other crown Corvida (Aves). Mol. Phylogenetics Evol. 2008, 47, 221–236, doi:10.1016/j.ympev.2008.01.017.
[10]
Outlaw, D.C.; Voelker, G. Pliocene climatic change in insular southeast Asia as an engine of diversification in Ficedula flycatchers. J. Biogeogr. 2008, 35, 739–752, doi:10.1111/j.1365-2699.2007.01821.x.
[11]
Voris, H.K. Maps of Pleistocene sea levels in Southeast Asia: Shorelines, river systems and time durations. J. Biogeogr. 2000, 27, 1153–1167, doi:10.1046/j.1365-2699.2000.00489.x.
[12]
Trainor, C.R.; Andersen, A.N. The ant fauna of Timor and neighbouring islands: Potential bridges between the disjunct faunas of South East Asia and Australia. Aust. J. Zool. 2010, 58, 133–144, doi:10.1071/ZO09113.
[13]
Kohout, R.J. Three new Polyrhachis sexspinosa-group species from the Philippines (Hymenoptera: Formicidae: Formicinae). Mem. Qld. Mus. 1987, 25, 169–176.
[14]
Kohout, R.J. Nomenclatural changes and new Australian records in the ant genus Polyrhachis Fr. Smith (Hymenoptera: Formicidae: Formicinae). Mem. Qld. Mus. 1987, 25, 429–438.
[15]
Kohout, R.J. A review of the Polyrhachis viehmeyeri species-group (Hymenoptera: Formicidae: Formicinae). Mem. Qld. Mus. 1990, 28, 499–508.
[16]
Kohout, R.J. Review of Polyrhachis (Cyrtomyrma) Forel (Hymenoptera: Formicidae: Formicinae) of Australia, Borneo, New Guinea and the Solomon Islands with descriptions of new species. Mem. Qld. Mus. 2006, 52, 87–146.
[17]
Kohout, R.J. A review of the Polyrhachis ants of Sulawesi with keys and descriptions of new species (Hymenoptera: Formicidae: Formicinae). Mem. Qld. Mus. 2008, 52, 255–317.
[18]
Kohout, R.J. A review of the Australian Polyrhachis ants of the subgenera Myrmhopla Forel and Hirtomyrma subgen. nov. (Hymenoptera: Formicidae: Formicinae). Mem. Qld. Mus. 2010, 55, 167–204.
[19]
Kohout, R.J. A review of the Australian Polyrhachis ants of the subgenera Myrma Billberg, Myrmatopa Forel, Myrmothrinax Forel and Polyrhachis Fr. Smith (Hymenoptera: Formicidae: Formicinae). Mem. Qld. Mus. Nat. 2012, 56, 25–59.
[20]
Dorow, W.H.O. Revision of the ant genus Polyrhachis Smith, 1857 (Hymenoptera: Formicidae: Formicinae) on subgenus level with keys, checklist of species and bibliography. Cour. Forsch.–Inst. Senckenberg 1995, 185, 1–113.
[21]
Robson, S.K.A.; Kohout, R.J. Evolution of nest-weaving behaviour in arboreal nesting ants of the genus Polyrhachis Fr. Smith (Hymenoptera: Formicidae). Aust. J. Ent. 2005, 44, 164–169, doi:10.1111/j.1440-6055.2005.00462.x.
[22]
Robson, S.K.A.; Kohout, R.J. A review of the nesting habits and socioecology of the ant genus Polyrhachis Fr. Smith. Asian Myrmecol. 2007, 1, 81–99.
[23]
Kohout, R.J. Revision of the subgenus Hedomyrma Forel of the genus Polyrhachis Fr. Smith (Hymenoptera: Formicidae: Formicinae). 2013. unpublished work.
[24]
Churchill, S. Australian Bats, 2nd ed.; Allen and Unwin: Crows Nest, Australia, 2008.
[25]
Gjershaug, J.O.; Kval？y, K.; R？v, N.; Prawiradilaga, D.M.; Suparman, U.; Rahman, Z. The taxonomic status of the Flores Hawk Eagle Spizaetus floris. Forktail 2004, 20, 55–62.
[26]
Pianka, E.R.; King, D.; King, R.A. Varanoid Lizards of the World; Indiana University Press: Bloomington, IN, USA, 2004.
[27]
Sangster, G.; Rozendaal, F.G. Systematic notes on Asian birds. 41. Territorial songs and species-level taxonomy of nightjars of the Caprimulgus macrurus complex, with the description of a new species. Zool. Verh. Leiden 2004, 350, 7–45.
[28]
Trainor, C.R.; Verbelen, P.; Johnstone, R.E.J. The avifauna of Alor and Pantar, Lesser Sundas, Indonesia. Forktail 2012, 28, 77–92.
[29]
Schodde, R.; Mason, I.J. Aves (Columbidae to Coraciidae). In Zoological Catalogue of Australia, Volume 37.2: Aves (Columbidae to Coraciidae); Houston, W.W.K., Wells, A., Eds.; Australian Government Publishing Service: Canberra, Australia, 1997.
[30]
Roos, M.C.; Kessler, P.J.A.; Gradstein, R.S.; Baas, P. Species diversity and endemism of five major Malesian islands: Diversity-area relationships. J. Biogeogr. 2004, 31, 1893–1908, doi:10.1111/j.1365-2699.2004.01154.x.
[31]
Stattersfield, A.J.; Crosby, M.J.; Long, A.J.; Wege, D.C. Endemic Bird Areas of the World: Priorities for Biodiversity Conservation; BirdLife International: Cambridge, UK, 1998.
[32]
Aplin, K.; Helgen, K.M. Quaternary murid rodents of Timor Part I: New material of Coryphomys buehleri Schaub, 1937, and description of a second species of the Genus. Bull. Am. Mus. Nat. Hist. 2010, 341, 1–80, doi:10.1206/692.1.
[33]
Kaiser, H.; Carvalho, V.L.; Ceballos, J.; Freed, P.; Heacox, S.; Lester, B.; Richards, S.J.; Trainor, C.R.; Sanchez, C.; O’Shea, M. The herpetofauna of Timor-Leste: A first report. ZooKeys 2011, 109, 19–86, doi:10.3897/zookeys.109.1439.
