The Differences of the Functional-morphological Strategy between the First and Second Dorsal Fins of the Living Coelacanth (<I>Latimeria chalumnae</I>)
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- ENDO Hideki
- The University Museum, The University of Tokyo Department of Global Agricultural Sciences, Graduate School of Agriculture and Agricultural Life Sciences, The University of Tokyo
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- OMURA Ayano
- Department of Global Agricultural Sciences, Graduate School of Agriculture and Agricultural Life Sciences, The University of Tokyo
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- SAKAI Takeo
- Department of Preventive Veterinary Medicine and Animal Health, College of Bioresource Sciences, Nihon University
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- ITOU Takuya
- Department of Preventive Veterinary Medicine and Animal Health, College of Bioresource Sciences, Nihon University
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- KOIE Hiroshi
- Department of Veterinary Physiology, College of Bioresource Sciences, Nihon University
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- IWATA Masamitsu
- Aquamarine Fukushima
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- ABE Yoshitaka
- Aquamarine Fukushima
Bibliographic Information
- Other Title
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- 現生シーラカンス（<I>Latimeria chalumnae</I>）における第一・第二背鰭間の機能形態学的戦略の相違
- The Differences of the Functional-morphological Strategy between the First and Second Dorsal Fins of the Living Coelacanth (Latimeria chalumnae)
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Abstract
The first and second dorsal fins of living coelacanths were studied using three-dimensional reconstructed images, while the sectional areas of the epaxial and hypaxial musculatures and the musculature related to the first and peculiar to the second dorsal fins were measured by image analyzing methods. The musculature related to the first dorsal fin was not enlarged to the lepidotrichia beyond the dorsal margin of the trunk; however, the fin rays consisting of lepidotrichia were supported by bone plate of the trunk. The two bones of the trunk supported the four bone elements of the second dorsal fin, in which the peculiar musculature was developed from the trunk area to the bone elements. The first dorsal fin may function as a passive stabilizer controlled by the relatively smaller musculature from the bone plate of the trunk and the mechanical articulation between the bone plate of the trunk and lepidotrichia. In contrast, the second dorsal fin represented an active generator of thrust during slow locomotion. We suggest that the active power generator of the sarcopterygian fin may be required in the second dorsal fin at the caudal region of the trunk, which possesses fewer epaxial and hypaxial muscles than the cranial region where the first dorsal fin is located.
Journal
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- Japanese Journal of Zoo and Wildlife Medicine
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Japanese Journal of Zoo and Wildlife Medicine 17 (2), 79-86, 2012
Japanese Society of Zoo and Wildlife Medicine
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Details 詳細情報について
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- CRID
- 1390001204488743808
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- NII Article ID
- 10030432321
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- NII Book ID
- AA11366156
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- ISSN
- 2185744X
- 13426133
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed