The locomotor system of the ocean sunfish Mola mola (L.): role of gelatinous exoskeleton, horizontal septum, muscles and tendons

dc.contributor.authorDavenport, John
dc.contributor.authorPhillips, Natasha D.
dc.contributor.authorCotter, Elizabeth
dc.contributor.authorEagling, Lawrence E.
dc.contributor.authorHoughton, Jonathan D. R.
dc.contributor.funderFisheries Society of the British Islesen
dc.contributor.funderQueen's University Belfasten
dc.date.accessioned2018-09-11T13:45:11Z
dc.date.available2018-09-11T13:45:11Z
dc.date.issued2018-06-21
dc.date.updated2018-09-11T13:36:25Z
dc.description.abstractAdult ocean sunfish are the heaviest living teleosts. They have no axial musculature or caudal fin. Propulsion is by unpaired dorsal and anal fins; a pseudocaudal fin (‘clavus’) acts as a rudder. Despite common perception, young sunfish are active predators that swim quickly, beating their vertical fins in unison to generate lift‐based propulsion and attain cruising speeds similar to salmon and marlin. Here we show that the thick subcutaneous layer (or ‘capsule’), already known to provide positive buoyancy, is also crucial to locomotion. It provides two compartments, one for dorsal fin musculature and one for anal fin muscles, separated by a thick, fibrous, elastic horizontal septum that is bound to the capsule itself, the roof of the skull and the dorsal surface of the short vertebral column. The compartments are braced sagittally by bony haemal and neural spines. Both fins are powered by white muscles distributed laterally and red muscles located medially. The anal fin muscles are mostly aligned dorso‐ventrally and have origins on the septum and haemal spines. Dorsal fin muscles vary in orientation; many have origins on the capsule above the skull and run near‐horizontally and some bipennate muscles have origins on both capsule and septum. Such bipennate muscle arrangements have not been described previously in fishes. Fin muscles have hinged tendons that pass through capsular channels and radial cartilages to insertions on fin rays. The capsule is gelatinous (89.8% water) with a collagen and elastin meshwork. Greasy in texture, calculations indicate capsular buoyancy is partly provided by lipid. Capsule, septum and tendons provide elastic structures likely to enhance muscle action and support fast cruising.en
dc.description.sponsorshipFisheries Society of the British Isles (PhD studentship; Alwyn Wheeler travel award); Queens University Belfast (G & M Williams Fund)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationDavenport, J., Phillips, N. D., Cotter, E., Eagling, L. E. and Houghton, J. D. R. (2018) 'The locomotor system of the ocean sunfish Mola mola (L.): role of gelatinous exoskeleton, horizontal septum, muscles and tendons', Journal of Anatomy, 233(3), pp. 347-357. doi:10.1111/joa.12842en
dc.identifier.doi10.1111/joa.12842
dc.identifier.endpage357en
dc.identifier.issn0021-8782
dc.identifier.issn1469-7580
dc.identifier.issued3en
dc.identifier.journaltitleJournal of Anatomyen
dc.identifier.startpage347en
dc.identifier.urihttps://hdl.handle.net/10468/6749
dc.identifier.volume233en
dc.language.isoenen
dc.publisherJohn Wiley & Sons, Inc.en
dc.rights© 2018, John Wiley & Sons Inc. This is the peer reviewed version of the following article: Davenport, J., Phillips, N. D., Cotter, E., Eagling, L. E. and Houghton, J. D. R. (2018) 'The locomotor system of the ocean sunfish Mola mola (L.): role of gelatinous exoskeleton, horizontal septum, muscles and tendons', Journal of Anatomy, 233(3), pp. 347-357. doi:10.1111/joa.12842, which has been published in final form at https://doi.org/10.1111/joa.12842. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.en
dc.subjectDorsal and anal finsen
dc.subjectHorizontal septumen
dc.subjectLocomotionen
dc.subjectMola molaen
dc.subjectOcean sunfishen
dc.subjectRed and white muscleen
dc.subjectSubcutaneous gelatinous capsuleen
dc.subjectTendonsen
dc.titleThe locomotor system of the ocean sunfish Mola mola (L.): role of gelatinous exoskeleton, horizontal septum, muscles and tendonsen
dc.typeArticle (peer-reviewed)en
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