{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,8,4]],"date-time":"2024-08-04T17:13:24Z","timestamp":1722791604666},"reference-count":29,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2011,11,24]],"date-time":"2011-11-24T00:00:00Z","timestamp":1322092800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Morphology"],"published-print":{"date-parts":[[2012,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Chimaera (Holocephali) are cartilaginous fishes with flexible operculi rather than external gill slits, suggesting ventilation occurs in a manner different from other fishes. We examined holocephalan ventilation morphology, behavior, and performance by anatomical investigations, high\u2010speed video, and in vivo pressure measurements from the buccal and parabranchial cranial cavities in <jats:italic>Hydrolagus colliei<\/jats:italic> and <jats:italic>Callorhinchus callorynchus<\/jats:italic>. Ventilatory modes ranged from quiet resting breathing to rapid \u201cactive\u201d breathing, yet external cranial movements\u2014excepting the passive movement of the opercular flap\u2014were always extremely subtle, and pressures generated were one to two orders of magnitude lower than those of other fishes. To explain ventilation with such minimal pressure generation and cranial motion, we propose an \u201caccordion\u201d model, whereby rostrocaudal movement of the visceral arches drives pressure differentials, albeit with little lateral or ventral movement. Chimaeroids have comparatively large oropharyngeal cavities, which can move fluid with a smaller linear dimension change than the comparatively smaller cavities of other fishes. Orobranchial pressures are often less than parabranchial pressures, suggesting flow in the \u201cwrong\u201d direction; however, the long gill curtains of chimaeroids may passively restrict backflow. We suggest that constraints on holocephalan jaw and hyoid movements were compensated for evolutionarily by novel visceral arch mechanics and kinematics. J. Morphol., 2012. \u00a9 2011 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/jmor.11035","type":"journal-article","created":{"date-parts":[[2011,11,24]],"date-time":"2011-11-24T08:22:31Z","timestamp":1322122951000},"page":"461-479","source":"Crossref","is-referenced-by-count":12,"title":["Very low pressures drive ventilatory flow in chimaeroid fishes"],"prefix":"10.1002","volume":"273","author":[{"given":"Mason N.","family":"Dean","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Adam P.","family":"Summers","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lara 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