Evolutionary history of marine mollusks in warm periods

2011 Fiscal Year Final Research Report

• Project/Area Number: 21740369
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Stratigraphy/Paleontology
• Research Institution: Yokohama National University
• Principal Investigator: WANI Ryoji 横浜国立大学, 環境情報研究院, 准教授 (70508580)
• Project Period (FY): 2009 – 2011
• Keywords: アンモナイト / オウムガイ / 温暖期 / 白亜紀 / 軟体動物化石

Research Abstract

Based on fossil specimens of mollusks(especially ammonoids and nautiloids), their evolutionary history of diversity and hatchling sizes was analyzed. The hatchling sizes in nautiloids show no change across the end-Cretaceous mass extinction. The analyses of hatchling sizes during Paleozoic and Mesozoic demonstrated that the hatchling sizes increased from Paleozoic toward Mesozoic, suggesting that sympatric speciation was a plausible dominant process of their macroevolution.

Research Products

• [Journal Article] Different modes of migration within Late Cretaceous ammonoids in northwestern Hokkaido, Japan : evidence from the analyses of shell whorls
  • Author(s): Ikeda, Y. and Wani, R.
  • Journal Title: Journal of Paleontology Volume: vol.86(in press)
• [Journal Article] Variable growth modes in Late Cretaceous ammonoids : implications for diverse early life histories
  • Author(s): Arai, K. and Wani, R.
  • Journal Title: Journal of Paleontology Volume: vol.86 Pages: 258-267
  • DOI: DOI:10.1666/11-068.1
• [Journal Article] Preferential predatory peeling : ammonoid vs. nautiloid shells from the Upper Carboniferous of Texas
  • Author(s): Wani, R., Jenkins, R. G., and Mapes, R. H.
  • Journal Title: Geobios Volume: vol.45 Pages: 129-137
  • DOI: DOI:10.1016/j.geobios.2011.11.007
• [Journal Article] Old and sticky. adhesive mechanisms in the living fossil Nautilus pompilius(Mollusca, Cephalopoda)
  • Author(s): von Byern, J., Wani, R., Schwaha, T., and Cyran, N.
  • Journal Title: Zoology Volume: vol.115 Pages: 1-11
  • DOI: DOI:10.1016/j.zool.2011.08.002
• [Journal Article] Sympatric speciation drove the macroevolution of fossil cephalopods
  • Author(s): Wani, R.
  • Journal Title: Geology Volume: vol.39 Pages: 1079-1082
  • DOI: DOI:10.1130/G32317.1
• [Journal Article] Large hatchling size in Cretaceous nautiloids persists across the end-Cretaceous mass extinction : new data of Hercoglossidae hatchlings
  • Author(s): Wani, R., Kurihara, K., and Ayyasami, K.
  • Journal Title: Cretaceous Research Volume: vol.32 Pages: 618-622
  • DOI: DOI:10.1016/j.cretres.2011.01.001
• [Journal Article] Intraspecific variation of hatchling size in Late Cretaceous ammonoids from Hokkaido, Japan : implication for planktic duration at early ontogenetic stage
  • Author(s): Tajika, A. and Wani, R.
  • Journal Title: Lethaia Volume: vol.44 Pages: 287-298
  • DOI: DOI:10.1111/j.1502-3931.2010.00242.x
• [Journal Article] Permanent El Nino during the Pliocene warm period not supported by coral evidence
  • Author(s): Watanabe, T., Suzuki, A., Minobe, S., Kawashima, T., Kameo, K., Minoshima, K., Aguilar, Y. M., Wani, R., Kawahata, H., Sowa, K., Nagai, T., and Kase, T.
  • Journal Title: Nature Volume: vol.471 Pages: 209-211
  • DOI: DOI:10.1038/nature09777
• [Journal Article] In situ Calyptogena colonies from Pliocene back-arc basin fills in Leyte Island
  • Author(s): Majima, R., Jenkins, R. G., Kase, T., Aguilar, Y. M., Nanjo, T., Wani, R., Wada, H., Fernando, A. G. S., and Hayashi, H.
  • Journal Title: Journal of Geological Society of Japan Volume: vol.116 Pages: XV-XVI
• [Journal Article] Conservative evolution in nautiloid shell morphology : evidence from the Pennsylvanian nautiloid Metacoceras mcchesneyi from Ohio, USA.
  • Author(s): Wani, R. and Mapes, R. H.
  • Journal Title: Journal of Paleontology Volume: vol.84 Pages: 477-492
  • DOI: DOI:10.1666/09-158.1
• [Journal Article] Ontogenetic change and intra-specific variation of shell morphology in the Cretaceous nautiloid(Cephalopoda, Mollusca) Eutrephoceras clementinum(d' Orbigny, 1840) from the Ariyalur area
  • Author(s): Wani, R. and Ayyasami, K.
  • Journal Title: Journal of Paleontology Volume: vol.83 Pages: 365-378
  • DOI: DOI:10.1666/08-119.1
• [Presentation] Preferential peeling : ammonoid versus nautiloid shells from the Upper Carboniferous of Texas, USA (2010)
  • Author(s): Wani, R. and Mapes, R. H.
  • Organizer: Eighth International Symposium, Cephalopods. Present & Past
  • Place of Presentation: Dijon France
  • Year and Date: 20100900
• [Presentation] 石炭紀後期のオウムガイMetacocerasの成長様式 (2010)
  • Author(s): 和仁良二・Mapes, R. H.
  • Organizer: 日本古生物学会2010年年会
  • Place of Presentation: つくば市
  • Year and Date: 20100600
• [Presentation] Huge hatchling size in Late Cretaceous nautiloids persists across the K/T boundary to modern nautiloids (2009)
  • Author(s): Wani, R., Kurihara, K., and Ayyasami, K.
  • Organizer: 8th International Symposium on the Cretaceous System. Plymouth
  • Place of Presentation: United Kingdom
  • Year and Date: 20090900