单词 | tiktaalik |
释义 | Tiktaalikn. Palaeontology. An extinct sarcopterygian fish of the late Devonian genus Tiktaalik, which is a transitional form between fish and tetrapods. Also: the genus itself.Tiktaalik fossils have arm-like skeletal structures, a neck and ribs similar to those of tetrapods, and a flattened skull. ΚΠ 2006 N. H. Shubin et al. in Nature 6 Apr. 764 The fin of Tiktaalik was capable of a range of postures, including a limb-like substrate-supported stance in which the shoulder and elbow were flexed and the distal skeleton extended. 2009 J. A. Coyne Why Evol. is True ii. 41 Somewhere, in freshwater sediments about 370 million years old, we'll find a very early land-dweller with reduced gills and limbs a bit sturdier than those of Tiktaalik. 2015 Wall St. Jrnl. 7 Mar. c7/5 Thus the first transitional creatures between fish and amphibians—of which the recently discovered ‘fishapod’, Tiktaalik, is the best current example—would have breathed via an air bladder. This is a new entry (OED Third Edition, June 2019; most recently modified version published online March 2022). < n.2006 |
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