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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Agriculture / Faculty of Agriculture >
Peer-reviewed Journal Articles, etc >
Insertion and withdrawal of extremely elongated genitalia: a simple mechanism with a highly modified morphology in the leaf beetle, Lema coronata
| Title: | Insertion and withdrawal of extremely elongated genitalia: a simple mechanism with a highly modified morphology in the leaf beetle, Lema coronata |
| Authors: | Matsumura, Yoko Browse this author | | Yoshizawa, Kazunori Browse this author →KAKEN DB |
| Keywords: | copulation | | Chrysomelidae | | Criocerinae | | endophallus | | internal sac | | morphology | | preadaptation |
| Issue Date: | Mar-2010 |
| Publisher: | Blackwell Publishing |
| Journal Title: | Biological Journal of the Linnean Society |
| Volume: | 99 |
| Issue: | 3 |
| Start Page: | 512 |
| End Page: | 520 |
| Publisher DOI: | 10.1111/j.1095-8312.2009.01376.x |
| Abstract: | Complicated genital structures are widely known in many animals. It is assumed that an increasing morphological complexity of genital structures would also increase the difficulty of inserting and withdrawing the structures. We examined the insertion and withdrawal mechanisms of extremely elongated genitalia in the Japanese leaf beetle, Lema (Lema) coronata. Insertion and withdrawal processes are completed quickly. Investigation of genital morphology showed that there are no protractor or retractor muscles attached to the elongated part. Instead, the elongated part is tightly enveloped by a membrane. Because of the close fit between the elongated part and its surrounding membrane, eversion of the membrane allows for insertion of the elongated part, and retraction of the membrane induces withdrawal of the elongated part. This surrounding membrane makes it possible to store the median ejaculatory guide (MEG) in a small genital cavity, with the basal portion of the elongated part extending internally against the entrance. This unusual character state is observed only in members of the subgenus Lema, which also have the elongated part. This condition can be considered to be a preadaptation for extreme elongation of genitalia. |
| Rights: | The definitive version is available at www.blackwell-synergy.com |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/44962 |
| 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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