单词 | polyprotodont |
释义 | polyprotodontadj.n. Zoology. A. adj. Having or characterized by more than two incisor teeth in the lower jaw; esp. designating the mainly carnivorous and insectivorous marsupials so characterized (sometimes classified in an order or suborder Polyprotodontia). Cf. diprotodont adj. ΘΚΠ the world > animals > mammals > group Implacenta > subclass Marsupialia (marsupials) > [adjective] > having specific type of teeth polyprotodont1868 triconodont1881 triconodontoid1895 polyprotodontid1900 the world > animals > animal body > general parts > head and neck > [adjective] > having teeth > having more than two front teeth polyprotodont1868 1868 R. Owen On Anat. Vertebr. III. 294 A retrospect of the modifications of marsupial dentition shows them to be divisible into two classes: one ‘polyprotodont’, or characterised by several pairs of mandibular incisors; the other ‘diprotodont’, or by a single pair... The polyprotodont type prevails in the American genera. 1892 Athenæum 14 May 636/2 He came to the conclusion that this anomalous form [sc. the marsupial mole, Notoryctes typhlops, newly discovered in Central Australia] should stand as a distinct family of polyprotodont marsupials. 1934 Q. Rev. Biol. 9 58/1 In their structural and functional development the fore limbs precede the hind limbs, not only in the polyprotodont marsupials,..but likewise in the more specialized diprotodont marsupials. 1974 Nature 8 Mar. 175/1 Peramelids retained a polyprotodont dentition. 1998 Proc. Royal Soc. B. 265 2381/1 The diprotodont versus polyprotodont condition of the lower incisors..[is] among those [marsupial characters] whose significance has been debated. B. n. A polyprotodont marsupial. ΘΚΠ the world > animals > mammals > group Implacenta > subclass Marsupialia (marsupials) > [noun] > parts of > animal defined by polyprotodont1870 1870 R. Owen in Proc. Royal Soc. 19 96 Instances of existing diprotodonts subsisting on animal food, and of existing polyprotodonts on vegetable food, are adduced. 1924 Philos. Trans. (Royal Soc.) B. 212 157 The early condition of the vitelline veins is essentially similar to that of the Polyprotodonts. 1977 Systematic Zool. 26 413/1 A third school..believed that borhyaenids were derived from generalized polyprotodonts. 2002 Nature 30 May 485/1 Opossums..are found only in North and South America, where they are carnivorous marsupials (polyprotodonts). Possums occur in Australia and are herbivorous marsupials (diprotodonts). This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < |
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