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Formidable carpal weaponry of Anas chathamica, Chatham Islanda€?s extinct flightless duck | Notornis and Birds New Zealand

机译:Chatham Islanda绝种的不会飞的鸭子Anas chathamica强大的腕骨武器|诺托尼斯和鸟类新西兰

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TheChathamIslandduck(Anseriformes:Anatidae:Anaschathamica)hadapronouncedandrugoseenlargementtothetipoftheprocessusextensoriusattheproximalendofitscarpometacarpus.Thisa€?carpalknoba€?wastheequalinsizeofthosefoundinsomemuchlargerwaterfowl(e.g.,steamerducks,Tachyeressp.),andwasdisproportionatelylargerthanthoseofallotherNewZealandwaterfowl.Theknobson20carpometacarpiexaminedallshowedevidenceofcontinuousbonedepositionattheirtipsandtheiruseasweaponsisimplied.ComparisonswithotherduckspecieshavingsimilarlyprominentandrugosecarpalknobssuggeststheChathamIslandduckmaintainedlong-termpairbondsandoccupiedcombinedfeedingandbreedingterritoriesyear-roundwhichbothsexesdefendedbelligerently.
机译:TheChathamIslandduck(雁形目:鸭科:Anaschathamica)?hadapronouncedandrugoseenlargementtothetipoftheprocessusextensoriusattheproximalendofitscarpometacarpus.Thisa€carpalknoba€wastheequalinsizeofthosefoundinsomemuchlargerwaterfowl(例如,steamerducks,Tachyeressp。),andwasdisproportionatelylargerthanthoseofallotherNewZealandwaterfowl.Theknobson20carpometacarpiexaminedallshowedevidenceofcontinuousbonedepositionattheirtipsandtheiruseasweaponsisimplied.ComparisonswithotherduckspecieshavingsimilarlyprominentandrugosecarpalknobssuggeststheChathamIslandduckmaintainedlong-termpairbondsandoccupiedcombinedfeedingandbreedingterritoriesyear-roundwhichbothsexesdefendedbelligerently。

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