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Orthoclads in Sakhalinian Amber

Dec 19, 2014

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Science

Presentation from 19th internationak Symposium on chironomidae devoted to the fossil fauna of Chironomidae in the tretiary (Paleogene) amber from Sakhalin

  • 1. Chironomids (Diptera: Chironomidae)in Sakhalinian Amber - first resultsViktor Baranov1,3, Trond Andersen21Leibniz Institute of Freshwater Ecology and Inland Fisheries(IGB), 2Bergen University Museum,Deparment of Natural History , 3I.I. Shmalhausen Institute Of Zoology NAS Ukraine

2. Introduction Sakhalinian amber isfossil resin which wasfirst collected during anexpedition to Sakhalin in1972 by thePaleontological Institute,Academy of Science ofthe USSR. Numerous traces offlourishing ecosystem ofthe past, including fossilinsects was found. 3. Taphonomy of Sakhalinian Amber Taphonomy from Greek taphos dead andnomos law, order is a science studyingprinciples of organism preservation as fossils. Amber from Sakhalin belongs to the rumanite-typeamber. Such ambers is a highly polymerized, and insectsinside of them are often deformed. Thus taxonomic placement of the Sakhalinian amberinsect inclusions is difficult. We have try to do our best without producing newgenera with poor diagnosis, thats why all newspecies placed in existing genera. 4. Chironomidae in Sakhalinian amber 840 inclusions of arthropods are known fromthe Sakhalinian amber 350 chironomids have been found, all of thembelonging to the subfamily Orthocladiinae 81 inclusions of Chironomidae males havebeen examined 9 males where selected for description beingreasonably well preserved. 5 sp.n. has been described in the 5 genera 5. Species account 6. Chironomidae in Sakhalinian amberSpecies describedHeterotrissocladius naibuchi Baranov et Andersen, 2014Paraphaenocladius nadezhdae Baranov et Andersen, 2014Pseudorthocladius zherikhini Baranov et Perkovsky, 2013Pseudosmittia kodrulae Baranov et Andersen, 2014Smittia sukachevae Baranov et Andersen, 2014Generically placedAntillocladius spOrthocladiinae incertae sedisOrthocladiinae sp AOrthocladiinae spBOrthocladiinae spC 7. Heterotrissocladius naibuchi 8. Paraphaenocladius nadezhdae 9. Pseudorthocladius zherikhiniAntillocladius sp. 10. Pseudosmittia kodrulae 11. Smittia sukachevae 12. Orthocladiinae sp. A 13. General remarks All midges recorded arebelongs to the Orthocladiinae All specimens are small, winglength less than 1,0 mm andmuch smaller than recentPalaearctic representatives ofthe respective genera All species are belongs(suppose to belong) to recentgenera which could inhabits (atlarval and pupal stage)standing waters or terrestrialand semiaquatic habitats So. Is it means something? 14. Completing the puzzle Saether and Andersen (1996) has shown thatwing and body length is decreasing inwidespread Chironomidae genera from Northto South Kodrul (1999) shown that flora of Sakhalin inthe late Paleocene Eocene resemblessubtropical to warm-moderate flora Could we combine paleobotanical andpaleoentomology data to reconstruct theclimate? 15. Acknowledgments Viktor Baranov express his sincere thanks to IGB and EUInterfaces project, for funding his attendance on thisconference We are indebted to Alexandr Rasnitsyn, for kindlyloaning us the inclusions from Sakhalin, to IrinaSukacheva, for her indispensable help with amberstudies. We are also grateful to Elena Lukashevich andTatiana Kodrul and Patrick Ashe for discussions onnematoceran paleontology, biogeography and the ageof the Sakhalin amber. V.B.s work in the collection atthe University Museum of Bergen was supported by anErnst Mayr travel grant from Harvard Museum ofComparative Zoology. And I want also to express my gratitude to two veryspecial people who are not with us any longer 16. Dr. Vladimir Zherikhin Dr. Nadezhda Kalugina 17. Thanks for attention!