{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T03:13:06Z","timestamp":1788837186417,"version":"build-2803163510"},"reference-count":16,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2008,2,26]],"date-time":"2008-02-26T00:00:00Z","timestamp":1203984000000},"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":[[2008,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>We examined the morphology of setae and microtrichia in <jats:italic>Aquarius paludum<\/jats:italic> during larval development using a scanning electron microscope. We then conducted immersion experiments with larvae and adults in oxygenated and deoxygenated water. The adult water strider body is covered by a pilose double layer consisting of upper long setae (30\u201380 \u03bcm) and lower filiform microtrichia (5\u20139 \u03bcm). Only setae are present on the legs. Microtrichia on the larval body are very short: 0.5\u20130.6 \u03bcm in first and second instars, and 0.8\u20131.7 \u03bcm in third to fifth instars. Larval body setae are approximately as long as those of adults (25\u201350 \u03bcm), but are much less dense at 1,800\u20135,750 setae per mm<jats:sup>2<\/jats:sup> versus 15,000\u201320,000 setae per mm<jats:sup>2<\/jats:sup> in adults. The density of setae on the legs remains relatively constant throughout development (larvae: 15,000\u201320,000 setae per mm<jats:sup>2<\/jats:sup>; adults: 20,000\u201326,000 setae per mm<jats:sup>2<\/jats:sup>). Immersion experiments demonstrated that young instars may use cuticular respiration. First\u2010 and second\u2010instar larvae survived underwater for several hours without a visible air supply, although they did not survive in deoxygenated water. We posit that the short body microtrichia have a waterproofing function in larvae, whereas they create a compressible air bubble in adults. In adults, waterproofing is accomplished by the setae. The density and length of setae on the legs of larvae was nearly the same as that on the body and legs of adults and is presumably optimized for waterproofing. Thus, a change in morphometrical parameters can result in a large functional change in the same structure. We discuss this interpretation in both ecological and physiological contexts. J. Morphol., 2008. \u00a9 2008 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/jmor.10619","type":"journal-article","created":{"date-parts":[[2008,2,26]],"date-time":"2008-02-26T19:46:27Z","timestamp":1204055187000},"page":"734-744","source":"Crossref","is-referenced-by-count":16,"title":["Skating and diving: Changes in functional morphology of the setal and microtrichial cover during ontogenesis in <i>Aquarius paludum<\/i> fabricius (Heteroptera, Gerridae)"],"prefix":"10.1002","volume":"269","author":[{"given":"P.J. Perez","family":"Goodwyn","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D.","family":"Voigt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K.","family":"Fujisaki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2008,2,26]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"337","article-title":"A comparative study of locomotion on the water surface in semiaquatic bugs (Insecta, Hemiptera, Gerromorpha)","volume":"139","author":"Andersen NM","year":"1976","journal-title":"Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening"},{"key":"e_1_2_1_3_1","first-page":"7","article-title":"Fine structure of the body hair layers and morphology of the spiracles of semiaquatic bugs (Insecta, Hemiptera, Gerromorpha) in relation to life on the water surface","volume":"140","author":"Andersen NM","year":"1977","journal-title":"Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening"},{"key":"e_1_2_1_4_1","doi-asserted-by":"crossref","first-page":"455","DOI":"10.1163\/9789004631267","volume-title":"The Semiaquatic Bugs (Hemiptera, Gerromorpha) Phylogeny, Adaptations, Biogeography and Classification","author":"Andersen NM","year":"1982"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1209\/epl\/i1999-00548-y"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.2307\/1482"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1039\/tf9444000546"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/242132a0"},{"key":"e_1_2_1_9_1","first-page":"377","volume-title":"Recent Progress in Surface Science","author":"Crisp DJ","year":"1964"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1096-3642.1989.tb01822.x"},{"key":"e_1_2_1_11_1","doi-asserted-by":"publisher","DOI":"10.1038\/432036a"},{"key":"e_1_2_1_12_1","first-page":"32","volume-title":"Wasserl\u00e4ufer. Die neue Brehm\u2010B\u00fccherei. Das Leben der Tiere und Pflanzen in Einzeldarstellungen","author":"Jordan KHC","year":"1952"},{"key":"e_1_2_1_13_1","doi-asserted-by":"publisher","DOI":"10.5962\/bhl.part.15602"},{"key":"e_1_2_1_14_1","volume-title":"Functional Surfaces in Biology","author":"Perez Goodwyn PJ"},{"key":"e_1_2_1_15_1","doi-asserted-by":"publisher","DOI":"10.1163\/187631296X00106"},{"key":"e_1_2_1_16_1","doi-asserted-by":"publisher","DOI":"10.2307\/2424638"},{"key":"e_1_2_1_17_1","first-page":"227","article-title":"Studies on plastron respiration. I. 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