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Paläontologische Zeitschrift

, Volume 66, Issue 3–4, pp 241–264 | Cite as

Ontogenetic variations of the Early Cretaceous non-marine bivalveTrigonioides (T.) heilongjiangensis and the concept of fossil species

  • Sha Jingeng Nanjing
Article

Abstract

With growth, the angle of V-ribs on the median flank ofTrigonioides (T.) heilongjiangensis enlarges; the subradial ribs on the anterior half vary from simple, but prominent, through feeble or vanished to bifurcate or multiple and clear; the number of submedian teeth increases and the variation in outline of the species is quite continuous. All individuals or populations which vary continuously in characters at one time horizon and/or in a certain time space within the same biogeographic region should be regarded as conspecific. Accordingly, the individuals of five taxa ofTrigonioides hitherto recognized in the eastern Heilongjiang area, namelyT. (T.) kodairai Kobayashi & Suzuki,T. (Wakinoa) wakinoensis intermedia Hase,T. (W.) subtrigonus Sha,T. (W.) cf.tamuraia Yang andTrigonioides sp., are regarded as representing various ontogenetic stages ofTrigonioides (T.) heilongjiangensis Sha & Gu. 263

Keywords

Early Cretaceous Dorsal View Adult Specimen Internal Mould Hinge Line 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Kurzfassung

BeiTrigonioides (T.) heilongjiangensis aus der Unterkreide des östlichen Heilongjiang, NE China, wird der Winkel der V-förmigen Rippen auf der Flankenmitte während des Wachstums größer; die subradiären Rippen auf der vorderen Flankenhälfte variieren zwischen einfach und dabei kräftig bis schwach oder fehlend und einfach oder mehrfach aufspaltend und deutlich. Die Zahl der unter dem Wirbel gelegenen Zähne nimmt zu, und der Umriß der Art variiert kontinuierlich. Alle Individuen oder Populationen, deren Merkmale in einem Zeithorizont und/oder in einem bestimmten Zeitraum innerhalb einer biogeographischen Region kontinuierlich variieren, sollten als eine Art betrachtet werden. Demzufolge werden Individuen aus dem östlichen Heilongjiang, die bislang zu fünf verschiedenen Taxa(T. (T.) kodairai Kobayashi & Suzuki,T. (Wakinoa) wakinoensis intermedia Hase,T. (W.) subtrigonus Sha, T. (W.) cf.tamuraia Yang undTrigonioides sp.) gestellt wurden, als verschiedene ontogenetische Individuen vonTrigonioides (T.) heilongjiangensis Sha & Gu betrachtet und mit ihr synonymisiert.

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References

  1. Boyd, D.W. & Newell, N.D. 1969. Limitations of Bernard and Munier-Chalmas system for bivalve hinge notation.—[In:] Moore, R. C. (ed.) Treatise on Invertebrate Paleontology, Pt.N. Mollusca 6, Bivalvia, Addendum: N908-N913, The Geological Society of America, New York & The University of Kansas Press, Lawrence, Kansas.Google Scholar
  2. Cox, L. R. 1952. Notes on the Trigoniidae with outline of a classification of the family.—Proceedings of the Malacological Society of London 30: 45–70, London.Google Scholar
  3. Cox, L. R. 1969. Internal Calcareous Structures of Hinge. - [In:] Moore, R.C. (ed.) Treatise on Invertebrate Paleontology, Pt. N, Mollusca 6, Bivalvia, General features of Bivalvia: N47-N56, The Geological Society of America, New York & The University of Kansas Press, Lawrence, Kansas.Google Scholar
  4. Mayr, E. 1963. Animal Species and Evolution.—797pp., Harvard University Press, Cambridge.Google Scholar
  5. Gu Zhiwei; Chen Jinhua & Sha Jingeng. 1984. Preliminary Study on Jurassic and Cretaceous Bivalves of Eastern Heilongjiang Province in China.—[In:] Research Team on the Mesozoic Coal-Bearing Formation in Eastern Heilongjiang (ed.) Fossils from the Middle Upper Jurassic and Lower Cretaceous in Eastern Heilongjiang province, China 2: 49–220, Heilongjiang Sciences & Technology Publishing House, Harbin. [In Chinese with English abstract]Google Scholar
  6. Gu Zhiwei; Huang Baoyu; Chen Chuzhen; Wen Shixuan; Ma Qihong; Lan Xiu; Xu Juntao; Liu Lu; Wang Deyou; Qiu Ranzhong; Huang Zhaoqi; Zhang Zuoming; Chen Jinhua & Wu Peili. 1976. Fossil Lamellibranchiata of China.—522 pp., Science Press, Beijing. [In Chinese]Google Scholar
  7. Guo Fuxiang. 1981. Bivalves from the Jingxing Formation (Cretaceous) in Western Yunnan with notes on the origin of theTrigonioides in Asia.—[In:] 12th. Annual Conference of the Palaeontological Society of China, Selected Papers: 61–79, Science Press, Beijing. [In Chinese]Google Scholar
  8. Hase, A. 1960. The Late Mesozoic formations and their molluscan fossils in West Chugoku and North Kyushu, Japan.—Journal of Science of the Hiroshima University (Series C) 3 (2): 281–342, Hiroshima.Google Scholar
  9. Kobayashi, T. & Suzuki, K. 1936. Non-marine shells of the Naktong-Wakino Series.—Japanese Journal of Geology and Geography 13 (3 & 4): 243–257, Tokyo.Google Scholar
  10. Kobayashi, T. & Suzuki, K. 1941. On the occurrence ofTrigonioides in Southeastern Manchuria.—Bulletin of the Geological Institute of Manchuri 101: 77–81, Hsin-ching.Google Scholar
  11. Maeda, S. 1963.Trigonioides from the Late Mesozoic Tetori Group, Central Japan.—Transactions and Proceedings of the Palaeontological Society of Japan (New Series) 51: 79–85, Tokyo.Google Scholar
  12. Ota, Y. 1959. On the »Nippononaia« from the Lower Cretaceous Wakino Formation, North Kyushu, Japan.—Transactions and Proceedings of the Palaeontological Society of Japan (New Series) 34: 105–110, Tokyo.Google Scholar
  13. Ota, Y. 1963. Notes on the relationship ofTrigonioides andPlicatounio, nonmarine Mesozoic Bivalvia from Eastern Asia.—Geological Reports of Hiroshima University 12: 503–512, Hiroshima.Google Scholar
  14. Ota, Y. 1974. Notes on the genusTrigonioides (Bivalvia).—Bulletin of University Department of Education 24 (3): 79–98, Fukuoka. [In Japanese]Google Scholar
  15. Seilacher, A. 1972. Divaricate patterns in pelecypod shells.—Lethaia 5 (3): 325–343, Oslo.CrossRefGoogle Scholar
  16. Suzuki, K. 1940. Non-marine molluscan faunule of the Siragi Series in South Tyosen.—Japanese Journal of Geology and Geography 17 (3 & 4): 215–231, Tokyo.Google Scholar
  17. Tamura, M. 1970. The hinge structure ofTrigonioides mifunensis sp. nov. from the Upper Cretaceous Mifun Group, Kumamoto Prefecture, Japan.—Memoirs of the Faculty of Education, Kumamoto University 18 (1): 38–52, Kumamoto.Google Scholar
  18. Tamura, M. 1975. New occurrence ofTrigonioides (Kumamotoa) mifunensis Tamura and a note onPterotrigonia sakakurai (Yehara) from Goshonoura Island, Kumamoto Prefecture, Japan.—Memoirs of the Faculty of Education, Kumamoto University 24: 53–58, Kumamoto.Google Scholar
  19. Tamura, M.1980. A summary of Cretaceous Bivalves of Fresh and Brackish Water in Japan.—Journal of the Geological Society of Korea 16 (4): 223–238, Seoul.Google Scholar
  20. Yang, S.Y. 1974. Note on the genusTrigonioides (Bivalvia).—Transactions and Proceedings of the Palaeontological Society of Japan (New Series) 95: 395–408, Tokyo.Google Scholar
  21. Yang, S.Y. 1978. Ontogenetic variation ofTrigonioides (s.s.)paucisulcatus (Cretaceous non-marine Bivalvia).—Transactions and Proceedings of the Palaeontological Society of Japan (New Series) 111: 333–347, Tokyo.Google Scholar
  22. Yang, S.Y. 1979. Some new bivalve species from the Lower Gyeongsang Group, Korea.—Transactions and Proceedings of the Palaeontological Society of Japan (New Series) 116: 223–234, Tokyo.Google Scholar
  23. Yang, S.Y. 1983. On the subgenusWakinoa (Cretaceous non-marine Bivalvia) from Geyongsang Group, Korea.—Transactions and Proceedings of the Palaeontological Society of Japan (New Series) 131: 177–190, Tokyo.Google Scholar
  24. Zhu Guoxing. 1980. Mollusca.—[In:] Shenyang Institute of Geology and Mineral Resources (ed.) Paleontological Atlas of Northeast China 2: 8–59, Geological Publishing House, Beijing. [In Chinese]Google Scholar

Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 1992

Authors and Affiliations

  • Sha Jingeng Nanjing
    • 1
  1. 1.Nanjing Institute of Geology and PalaeontologyAcademia SinicaNanjingP.R. China

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