Spinotoma ruicheni: A new Late Cretaceous genus and species of wedge-shaped beetle from Burmese amber (Coleoptera,Ripiphoridae, Pelecotominae) |
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| Institution: | 1. Department of Entomology, National Taiwan University, No. 27, Lane 113, Sec. 4, Roosevelt Rd., 106, Taipei, Taiwan;2. Department of Life Sciences, National Taiwan Normal University, No. 88, Ting-Chow Rd, Sec. 4, 116, Taipei, Taiwan;1. Department of Environmental Biology, University of Rzeszów, ul. Zelwerowicza 4, PL35-601 Rzeszów, Poland;2. Institute of Biology, Pedagogical University of Kraków, Podbrzezie 3, 31-054 Kraków, Poland;3. Institute of Systematic and Evolution of Animals, Polish Academy of Sciences, Sławkowska 17, 31-016 Kraków, Poland;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China;2. Department of Earth Sciences, The University of Hong Kong, Hong Kong Special Administrative Region, China;3. Institut de Systématique, Évolution, Biodiversité, ISYEB-UMR 7205-CNRS, MNHN, UPMC, EPHE, Muséum National d''Histoire Naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Entomologie, F-75005, Paris, France;4. Department of Earth Sciences, The Natural History Museum, London SW7 5BD, UK;5. Goglio (Tianjin) Packaging Co. Ltd, No. 99, West 11th Avenue, Airport Economic Area, Tianjin, China;6. Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 1, Beichen West Road, Beijing 100101, China;1. State Key Laboratory of Palaeobiology and Stratigraphy, Center for Excellence in Life and Paleoenvironment, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China;2. University of Science and Technology of China, Hefei 230026, China;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China;2. Department of Earth Sciences, Natural History Museum, London SW7 5BD, UK;3. Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 1, Beichen West Road, Beijing 100101, China;4. Department of Earth Sciences, University of Hong Kong, Hong Kong Special Administrative Region, China;1. Nad Vodovodem 16, CZ-100 00, Praha 10, Czech Republic;2. Department of Zoology, Faculty of Science, Charles University in Prague, Viničná 7, 128 44, Praha 10, Czech Republic;3. Division of Invertebrate Zoology, American Museum of Natural History, Central Park West at 79th Street, New York, NY, 10024-5192, USA;4. Division of Entomology, Natural History Museum, Department of Ecology & Evolutionary Biology, 1501 Crestline Drive, Suite 140, University of Kansas, Lawrence, KS, 66045-4415, USA;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, China;2. Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK;3. Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 1, Beichen West Road, Beijing 100101, China;4. Department of Earth Sciences, University of Hong Kong, Hong Kong Special Administrative Region, China |
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| Abstract: | A new genus and species of ripiphorid beetle is described based on a female specimen preserved in Upper Cretaceous (Cenomanian, ca. 99 Ma) amber from northern Myanmar, under the name of Spinotoma ruicheni gen. et sp. nov. It belongs to the extant Pelecotominae and represents the second documented occurrence of this subfamily in the Late Cretaceous. This new taxon is morphologically distinguishable in Pelecotominae by the combination of following characters: eyes oval, without incision; antennomeres V–X serrate, with XI fusiform; maxillary palpi unmodified; protarsi shorter than protibiae; tibiae sparsely provided with spines; tibial spurs formula 2-0-2. Together with other previously reported fossil ripiphorids, it highlights the species diversification of wedge-shaped beetles during their early evolution. On the other hand, a morphological similarity between Spinotoma and modern pelecotomines and the occurrence of xylophagous beetles in the Burmese amber suggest a similar host preference in wood-boring beetles for this species, shedding lights on an ancient host-parasitoid relationship in the late Mesozoic. This paper also provides a brief discussion on the taxonomy and evolution of Mesozoic wedge-shaped beetles. The wedged-shaped body form and fully-developed elytra in Recent Pelecotominae and Ptilophorinae are considered to be derived from their early ancestors rather than evolved with the onset of flowering plants during the Cretaceous as commonly thought. |
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| Keywords: | Ripiphoridae Pelecotominae Upper Cretaceous Burmese amber Palaeobiology |
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