Japan Geoscience Union Meeting 2015

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Oral

Symbol B (Biogeosciences) » B-PT Paleontology

[B-PT26] Geogenomics

Tue. May 26, 2015 4:15 PM - 6:00 PM 104 (1F)

Convener:*Kazuyoshi Endo(Department of Earth and Planetary Science, Tokyo University), Tsuyoshi Komiya(Department of Earth Science & Astronomy Graduate School of Arts and Sciences The University of Tokyo), Naohiko Ohkouchi(Japan Agency for Marine-Earth Science and Technology), Chair:Kazuyoshi Endo(Department of Earth and Planetary Science, Tokyo University)

5:51 PM - 5:54 PM

[BPT26-P03] Comparative anatomy of molluscs

3-min talk in an oral session

*Takenori SASAKI1 (1.The University Museum, The University of Tokyo)

Keywords:comparative anatomy, Mollusca

The phylum Mollusca is characterized by a diversity of body plan. Animals of extant molluscs are categorized into seven major types, namely (1) shell-less vermiform aplacoporans, (2) polyplacophorans with eight shell plates and repetition of internal organs, (3) monoplacophorans with a single shell and internal iteration, (4) bivalves with shells divided into right and left, (5) gastropods diagnosed by the operculum and ontogenetic torsion, (6) cephalopods with the arms/tentacles modified from the foot, (7) antero-posteriorly elongated tusk-like scaphopods. In addition, novel forms have been found in fossils, and they are regarded as ancestral molluscs connecting intermediate missing links or allegedly assigned to molluscs. One of keys to understanding of diversification of molluscan body structure is comparison of organogenesis in ontogeny. This viewpoint further needs investigation of development-controlling genes and leads into comparative genomic research.