| Co-Investigator(Kenkyū-buntansha) |
ANDO Hitoshi Tsurumi University, Faculty of Dental Medicine, Assistant Professor, 歯学部, 助手 (00282765)
YAHATA Kensuke University of Tsukuba, Institute of Biological Sciences, Lecturer, 生物科学系, 講師 (70302370)
TSUTSUMI Tadaaki Fukushima University, Faculty of Education, Associate Professor, 教育学部, 助教授 (80282250)
IKUTA Kyosuke OSAKA KYOIKU UNIVERSITY, Faculty of Education, Assistant Professor, 教育学部, 助手 (30299367)
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| Research Abstract |
In order to understand the diversity of ovarian structure and oogenesis in arthropods, we made a comparative morphological observations especially on the groups where no reliable information on these characteristics was available.
In chelicerates, we described the female reproductive system of a schizomid in detail for the first time (Miyazaki et al., '01), and the outline of life history of a pseudoscorpion based on the seasonal change of ovarian histology (Kato & Tsutsumi, in press).
In pycnogonids, we ascertained the position of their gonads was unique among arthropods (Miyazaki & Pass, in press). The deviated position of genital pores of an austorodecid pycnogonid was corrected (Miyazaki, in press).
In insects, the ultrastructure of egg membrane of a mantophasmid was examined for the first time, and some unique characteristics were described (Tsutsumi et al., in press). The oogenesis and postembryonic development of ovary were compared between, oviparous and ovoviviparous mayflies, and some differences probably reflected their distinct reproductive modes were found (Takahashi & Tsutsumi, 'O1, '02; Kageyama & Tsutsumi, in press).
In myriapods, a comprehensive observation was made on diplopods, and the basic structures of ovary were inferred in their main groups.
In crustaceans, the chelicerate-like ovaries in some groups of ostracods were shown to be evolved convergently. Also the ovarian structure in astacids, the postembryonic development of gonads in notostracans (Mitsumoto & Makioka, '02, '03), and the structure of gonads in an epicarid (Matsuzawa & Yahata, '03) were described.
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