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2001 Fiscal Year Final Research Report Summary

RECONSTRUCTION OF HEXAPOD PHYLOGENY BASED ON THE EVOLUTIONARY TRANSITION OF EMBRYONIC MEMBRANES: EMBRYOLOGICAL STUDY ON DIPLURA

Research Project

Project/Area Number 12640674
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 系統・分類
Research InstitutionUNIVERSITY OF TSUKUBA

Principal Investigator

MACHIDA Ryuichiro  UNIVERSITY OF TSUKUBA, INSTITUTE OF BIOLOGICAL SCIENCES, ASSOCIATE PROFESSOR, 生物科学系, 助教授 (50199725)

Project Period (FY) 2000 – 2001
KeywordsINSECTA / CRUSTACEA / MYRIAPODA / DIPLURA / EMBRYONIC MEMBRANE / BLASTODERM CUTICLE / COMPARATIVE EMBRYOLOGY / SYSTEMATIC ZOOLOGY
Research Abstract

One of the most controversial problems in hexapod phylogeny concerns the Diplura. In this research project, I extend a phylogenetic discussion involving Diplura, in the light of the scheme 'the evolutionary changes of embryonic membranes and the specialization between the embryo proper and embryonic membranes in hexapods and allied arthropods' that I have developed and demonstrated.
I critically examined the dipluran embryogenesis with special reference to the development of embryonic membranes and related phenomena. The following results were deduced : 1) the cuticular egg envelope of Diplura is derived both from the embryo proper and serosa, to be categorized in the blastoderm cuticle ; 2) a homologue of the amnion, which has been regarded as an embryological autapomorphy of Ectognatha, develops in Diplura ; and 3) any structures comparable to the amnioserosal fold are not formed, in spite of the production of amnion, in Diplura.
These results obtained can be read, in the context of 't … More he evolutionary changes of embryonic membranes and the specialization between the embryo proper and embryonic membranes in hexapods and allied arthropods', as follows : 1) the production of blastoderm cuticle in Diplura is to be recognized as being plesiomorphic within hexapods ; 2) the production of amnion can be designated as a synapomorphy of Diplura and Ectognatha ; and 3) it is not the production of amnion but the formation of amnioserosal folds as well as the linkage of amniotic production to the formation of fold, that should be nominated as the autapomorphy of Ectognatha, were precisely Dicondylia. Consequently, proposed is a phylogeny formulated as : Hexapoda = Collembola + (Diplura + Ectognatha (= Archaeognatha + Dicondylia (= Zygentoma + Pterygota))). This requires a substantial revision to the currently accepted hexapod phylogeny formulated as : Hexapoda = Entognatha (= Collembola + Diplura) + Ectognatha (= Archaeognatha + Dicondylia (= Zygentoma + Pterygota)), rejecting a monophyletic status of Entognatha. It is verified as well that the scheme I have argued concerning 'the evolutionary changes of embryonic membranes and the specialization between the embryo proper and embryonic membranes in hexapods and allied arthropods' does not need to be revised, even if either Crustacea or Myriapoda showing the sister relationship to Hexapoda. Less

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] T.Ikeda, R.Mahcida: "Embryogenesis of the dipluran Lepidocampa weberi Oudemans (Hexapoda: Diplura, Caimpodeidae); Formation of dorsal organ and related Phenomena"Journal of Morphology. 249. 242-251 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.Machida, et al.: "Evolutionary changes in developmental potentials of the embryo proper and embryonic membranes in Hexapoda: A synthesis of the revised"Proceedings of Arthropodan Embryological Society of Japan. 37(印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. IKEDA, R. MACHIDA: "EMBRYOGENESIS OF THE DIPLURAN LEPIDOCAMPA WEBERI OUDEMANS (HEXAPODA : DIPLURA, CAMPODEIDAE) : FORMATION OF DORSAL ORGAN AND RELATED PHENOMENA"JOURNAL OF MORPHOLOGY. Vol. 249. 242-251 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R. MACHIDA, Y. IKEDA, K. TOJO: "EVOLUTIONARY CHANGES IN DEVELOPMENTAL POTENTIALS OF THE EMBRYO PROPER AND EMBRYONIC MEMBRANES IN HEXAPODA : A SYNTHESIS REVISED"PROCEEDINGS OF ARTHROPODAN EMBRYOLOGICAL SOCIETY OF JAPAN. VOL. 37,(IN PRESS). (2002)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17  

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