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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Agriculture / Faculty of Agriculture >
Peer-reviewed Journal Articles, etc >
Two intromittent organs inZorotypus caudelli(Insecta, Zoraptera): the paradoxical coexistence of an extremely long tube and a large spermatophore
| Title: | Two intromittent organs inZorotypus caudelli(Insecta, Zoraptera): the paradoxical coexistence of an extremely long tube and a large spermatophore |
| Authors: | Matsumura, Yoko Browse this author | | Yoshizawa, Kazunori Browse this author →KAKEN DB | | Machida, Ryuichiro Browse this author | | Mashimo, Yuta Browse this author | | Dallai, Romano Browse this author | | Gottardo, Marco Browse this author | | Kleinteich, Thomas Browse this author | | Michels, Jan Browse this author | | Gorb, Stanislav N. Browse this author | | Beutel, Rolf G. Browse this author |
| Keywords: | copulation | | insertion | | novelty | | penis | | preadaptation | | sexual selection | | withdrawal |
| Issue Date: | May-2014 |
| Publisher: | Wiley-blackwell |
| Journal Title: | Biological Journal of the Linnean Society |
| Volume: | 112 |
| Issue: | 1 |
| Start Page: | 40 |
| End Page: | 54 |
| Publisher DOI: | 10.1111/bij.12260 |
| Abstract: | Very unusual genitalia of the species Zorotypus caudelli are described. It contains the unique configuration of two different intromittent organs, one of them strongly elongated. Hyper elongated genitalia are known in different groups of insects. Males have to accommodate these unwieldy structures in the limited spaces of the abdomen and manipulate them acutely during copulation. A crucial question is how do species with elongated genitalia cope with these requirements? To investigate this, we studied key features enabling storage, insertion, and withdrawal of the elongated genitalia. The co-existence of an elongated narrow tube and a bulky spermatophore is a highly unusual and apparently paradoxical condition. However, we demonstrate that the tube is not involved in sperm transmission, whereas the large spermatophore is transferred to females by a membranous fold of the genitalia. The movement of the spermatophore is caused by haemolymph pressure, which likely also promotes the insertion of both intromittent organs. A comparison with the genital anatomy and reproductive mode in related groups suggests that the elongated tube and its accommodating pouch is a de novo structure, and that the ancestral sperm transport via spermatophore is a preadaptive condition for the acquisition of this unusual structure. |
| Rights: | The definitive version is available at www.blackwell-synergy.com |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/59125 |
| Appears in Collections: | 農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 吉澤 和徳
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