Continuous growth-line sequences in gastropod shells |
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| Institution: | 1. Department of Geology and Mineralogy, Kyoto University, Kyoto 606-8502, Japan;2. The Kyoto University Museum, Kyoto 606-8502, Japan;1. CICTERRA (CONICET–Universidad Nacional de Córdoba), X5016GCB Córdoba, Argentina;2. Departamento de Geología, Universidad de Oviedo, 33005 Oviedo, Spain;3. Palaeontology Section, Earth Science Department, The Natural History Museum, Cromwell Road, London SW7 5BD, UK;4. 146, Church Hill Road, Sutton, Surrey SM3 8NF, England, UK;1. School of Earth and Environmental Sciences, University of Portsmouth, Burnaby Building, Burnaby Road, Portsmouth PO1 3QL, UK;2. School of Environment, Earth and Ecosystem Science, The Open University, Milton Keynes, MK7 6AA, UK;1. Département histoire de la Terre, Muséum national d’histoire naturelle, BP 38, 57, rue Cuvier, 75231 Paris cedex 05, France;2. CASP, 181A Huntingdon Road, Cambridge CB3 0DH, United Kingdom;1. Atmosphere and Ocean Research Institute, The University of Tokyo, Chiba 277-8564, Japan;2. College of Fisheries, Guangdong Ocean University, Zhanjiang 524088, China;3. Department of Radiation Chemistry, Institute of Radiation Emergency Medicine, Hirosaki University, Aomori 036-8564, Japan;4. Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo 113-003, Japan;5. National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency, Kanagawa 236-8648, Japan;6. Institute of Natural and Environmental Sciences, University of Hyogo, 6 Yayoigaoka, Sanda, Hyogo 669-1546, Japan |
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| Abstract: | Studies of gastropod shell growth at the level of fine growth layers are scarce, because coiling of gastropod shells hinders the observation of continuous growth series spanning across whorls. We propose here a new method to obtain continuous growth patterns of gastropod shells over whorls with Terebralia palustris (L.) as an example. Comparison of vertical and horizontal sections of the shell of this species reveals that growth patterns can be observed continuously for several whorls on the vertical section of the columella. In addition, an obvious tidal growth pattern preserved in this species enables us to trace its growth with a precision of 12.4 h and indicates that it takes about two years for a shell to grow from 3 cm to 9.5 cm in height and add 5 complete whorls. |
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