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Published: 2020-05-19

Eggersanthus Sittichaya & Smith gen. nov., a new Oriental ambrosia beetle genus (Coleoptera: Curculionidae: Scolytinae: Xyleborini)

1Prince of Songkla University, Agricultural Innovation and Management Division, Faculty of Natural Resources, Hat Yai, Songkhla, 90112, Thailand.
Michigan State University, Department of Entomology, 288 Farm Lane, room 243, East Lansing, MI 48824, USA.
Coleoptera Oriental region Thailand Arixyleborus sublaevis new genus


A new genus, Eggersanthus Sittichaya & Smith gen. nov is described from a single species, Webbia sublaevis Eggers, 1927. The taxonomic characters of Eggersanthus and the morphologically similar genus Arixyleborus are analyzed and compared, and the status of the Webbia genus group is discussed.



  1. Beaver, R.A. & Hulcr, J. (2008) A review of the ambrosia beetle genus Cryptoxyleborus Schedl (Coleoptera, Curculionidae: Scolytinae). The Coleopterists Bulletin, 62, 133–153.

    Beaver, R.A. & Liu, L.-Y. (2010) An annotated synopsis of Taiwanese bark and ambrosia beetles, with new synonymy, new combinations and new records (Coleoptera: Curculionidae: Scolytinae). Zootaxa, 2602 (1), 1–47.

    Beaver, R.A., Sittichaya, W. & Liu, L.-Y. (2014) A synopsis of the scolytine ambrosia beetles of Thailand (Coleoptera: Curculionidae: Scolytinae). Zootaxa, 3875 (1), 1–82.

    Beaver, R.A., Sittichaya, W. & Liu, L.-Y. (2019) A review of the genus Immanus Hulcr and Cognato with a key to species (Coleoptera: Curculionidae: Scolytinae: Xyleborini). Zootaxa 4585 (2), 378–386.

    Browne, F.G. (1950) New Scolytidae and Platypodidae (Coleoptera) from Malaya. Annals and Magazine of Natural History, Series 12, 3, 641–650.

    Browne, F.G. (1958) Some aspects of host selection among ambrosia beetles in the humid tropics of South-East Asia. Malayan Forester, 21, 164–182.

    Browne, F.G. (1961) The biology of Malayan Scolytidae and Platypodidae. Malayan Forest Records, 22, 1–255.

    Browne, F.G. (1963) Taxonomic notes on Scolytidae (Coleoptera). Entomologische Berichten, 23, 53–59.

    Cognato, A.I., Jordal, B.H. & Rubinoff, D. (2018) Ancient “wanderlust” leads to diversification of endemic Hawaiian Xyleborus Species (Coleoptera: Curculionidae: Scolytinae). Insect Systematic and Diversity, 2, 1–9.

    Cognato, A.I., Hulcr, J., Dole, S.A. & Jordal, B.H. (2011) Phylogeny of haplodiploid, fungus growing ambrosia beetles (Curculionidae: Scolytinae: Xyleborini) inferred from molecular and morphological data. Zoologica Scripta, 40, 174–186.

    Cognato, A.I., Smith, S.M., Li, Y., Pham, T.H. & Hulcr, J. (2019) Genetic variability among native Xyleborus glabratus Eichhoff populations native to Southeast Asia and the description of two related species. Journal of Economic Entomology, 112, 1274–1284.

    Cognato, A.I., Smith, S.M. & Beaver, R.A. (2020) Two new genera of Oriental xyleborine ambrosia beetles (Coleoptera, Curculionidae: Scolytinae). Zootaxa, 4722, 540–554.

    Dole, S.A. & Cognato, A.I. (2010) Revision of Xylosandrus Reitter (Curculionidae: Scolytinae). Proceedings of the California Academy of Science, 61, 451–545.

    Eggers, H. (1927) New indo-malayische Borkenkäfer (Ipidae). II. Nachtrag. Philippine Journal of Science, 33, 67–108.

    Gohli, J., Kirkendall, L.R., Smith, S.M., Cognato, A.I., Hulcr, J. & Jordal, B.H. (2017) Biological factors contributing to bark and ambrosia beetle species diversification. Evolution, 71, 1258–1272.

    Gomez, D.F., Skelton, J., Steininger, M.S., Stouthamer, R., Rugman-Jones, P., Sittichaya, W., Rabaglia, R.J. & Hulcr, J. (2018) Species within the Euwallacea fornicatus (Coleoptera: Curculionidae) complex revealed by morphometric and phylogenetic analyses. Insect Systematic and Diversity, 2 (6), 1–11.

    Hopkins, A.D. (1915a) Classification of the Cryphalinae with descriptions of new genera and species. United States Department of Agriculture, Report No. 99. Government Printing Office, Washington, 75 pp.

    Hopkins, A.D. (1915b) Contributions toward a monograph of the scolytid beetles, Part II Preliminary classification of the superfamily Scolytoidea. United States Department of Agriculture, Bureau of Entomology/Technical Series, 17, 165–232.

    Hulcr, J. & Cognato, A.I. (2009) Three new genera of Oriental Xyleborina (Coleoptera: Curculionidae: Scolytinae). Zootaxa, 2204 (1), 19–36.

    Hulcr, J. & Cognato, A.I. (2010) New genera of Palaeotropical Xyleborini (Coleoptera: Curculionidae: Scolytinae) based on congruence between morphological and molecular characters. Zootaxa, 2717 (1), 1–33.

    Hulcr, J. & Cognato, A.I. (2013) Xyleborini of New Guinea: A Taxonomic Monograph. Thomas Say Publications in Entomology, The Entomological Society of America, Annapolis, Maryland, 172 pp.

    Hulcr, J., Dole, S.A., Beaver, R.A. & Cognato, A.I. (2007) Cladistic review of generic taxonomic characters in Xyleborina (Coleoptera: Curculionidae: Scolytinae). Systematic Entomology, 32, 568‒584.

    Hulcr, J., Atkinson, T.H., Cognato, A.I., Jordal, B.H. & McKenna, D.M. (2015) Morphology, taxonomy, and phylogenetics of bark beetles. In: Vega, F.E. & Hofstetter, R.W. (Eds.), Bark Beetles Biology and Ecology of Native and Invasive Species. Academic Press, London, pp. 41–84.

    Mandelshtam, M.Y., Petrov, A.V., Smith, S.M. & Cognato, A.I. (2019) Resurrection of Heteroborips Reitter, 1913 (Coleoptera: Curculionidae: Scolytinae) from synonymy with Xyleborus Eichhoff, 1864. The Coleopterists Bulletin, 73, 387−394.

    Schedl, K.E. (1936) Scolytidae and Platypodidae: Fauna Philippinensis, IV. Philippine Journal of Science, 60, 59–67.

    Schedl, K.E. (1937) Scolytidae and Platypodidae 34 Contribution Fauna Borneensis, Part I. Sarawak Museum Journal, Kuching, 4, 543–552.

    Schedl, K.E. (1952) Zur synonymie der Borkenkäfer I. Entomologische Blätter, 47/48, 158–164.

    Sittichaya, W. & Beaver, R.A. (2018) Cnestus quadrispinosus, a new species of xyleborine ambrosia beetle from Thailand and Borneo (Coleoptera, Curculionidae, Scolytinae, Xyleborini). ZooKeys, 795, 31–37.

    Smith, S.M. & Hulcr, J. (2015) Scolytus and other economically important bark and ambrosia beetles. In: Vega, F. & Hofstetter, R. (Eds.), Bark Beetles: Biology and Ecology of Native and Invasive Species. Elsevier/Academic Press, London, pp. 495−531.

    Smith, S.M., Beaver, R.A. & Cognato, A.I. (2018) New synonymy, new combinations and taxonomic changes in Japanese xyleborine ambrosia beetles (Coleoptera: Curculionidae: Scolytinae). Zootaxa, 4521 (3), 391−403.

    Smith, S.M, Gomez, D.F., Beaver, R.A., Hulcr, J. & Cognato, A.I. (2019a) Reassessment of the species in the Euwallacea fornicatus (Coleoptera: Curculionidae: Scolytinae) complex after the rediscovery of the ‘lost’ type specimen. Insects, 10, 261.

    Smith, S.M., Beaver, R.A., Cognato, A.I., Hulcr, J. & Redford, A.J. (2019b) Southeast Asian Ambrosia Beetle ID. USDA APHIS Identification Technology Program (ITP) and Michigan State University, Fort Collins, Colorado. Available from: (accessed 14 April 2020)

    Smith, S.M., Beaver, R.A. & Cognato, A.I. (2020) Taxonomic changes for Indo-Malayan ambrosia beetles (Coleoptera: Curculionidae: Scolytinae: Xyleborini). The Coleopterists Bulletin, 74, 37–40.