symmetrodontn.adj.

/sɪˈmɛtrəʊdɒnt/

Etymology: < modern Latin order name Symmetrodonta (G. G. Simpson 1925, in Amer. Jrnl. Sci. CCX. 560), < symmetr- (in symmetry n.) + Greek ὀδούς , ὀδοντ- tooth, in allusion to the form of the teeth (see quot. 1979 at sense B.).

A. n.

A fossil mammal of the order Symmetrodonta, known from remains found in North America and Europe.

ΘΚΠ

the world > animals > mammals > [noun] > fossil or extinct

legh1774

thylacothere1838

anthracothere1848

anchithere1868

amblypod1877

Bramathere1879

multituberculate1888

promammal1889

tillodont1889

tinoceratid1895

uintathere1898

arsinoitherium1902

symmetrodont1933

synapsid1956

1933 A. S. Romer Vertebr. Paleontol. xii. 260 The symmetrodonts seem to have been somewhat off the main evolutionary line.

1979 R. C. Fox in Fairbridge & Jablonski Encycl. Paleont. 429/2 Symmetrodonts were small shrew~sized mammals, probably having insectivorous food habits.

B. adj.

Of or pertaining to an animal of this kind or the order including it.

ΘΚΠ

the world > animals > mammals > [adjective] > of fossil or extinct types

thylacotherian1838

multituberculate1884

tinoceratid1891

synapsidan1903

synapsid1910

symmetrodont1950

1950 Nature 21 Oct. 696/2 The specimen can easily be described as a lower symmetrodont cheek tooth.

1977 A. Hallam Planet Earth 223 Triconodont and symmetrodont mammals died out during the Cretaceous.

1979 R. C. Fox in Fairbridge & Jablonski Encycl. Paleont. 429/2 Symmetrodont molars are highly characteristic; both upper and lower crowns formed simple occlusal triangles... The lower molar triangles are reversed in respect to the uppers and occlusion was alternate in the sense that each molar occluded within the embrasure between two successive molars on the opposite jaw.

This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2018).

单词	symmetrodont
释义	symmetrodontn.adj. /sɪˈmɛtrəʊdɒnt/ Etymology: < modern Latin order name Symmetrodonta (G. G. Simpson 1925, in Amer. Jrnl. Sci. CCX. 560), < symmetr- (in symmetry n.) + Greek ὀδούς , ὀδοντ- tooth, in allusion to the form of the teeth (see quot. 1979 at sense B.). A. n. A fossil mammal of the order Symmetrodonta, known from remains found in North America and Europe. ΘΚΠ the world > animals > mammals > [noun] > fossil or extinct legh1774 thylacothere1838 anthracothere1848 anchithere1868 amblypod1877 Bramathere1879 multituberculate1888 promammal1889 tillodont1889 tinoceratid1895 uintathere1898 arsinoitherium1902 symmetrodont1933 synapsid1956 1933 A. S. Romer Vertebr. Paleontol. xii. 260 The symmetrodonts seem to have been somewhat off the main evolutionary line. 1979 R. C. Fox in Fairbridge & Jablonski Encycl. Paleont. 429/2 Symmetrodonts were small shrew~sized mammals, probably having insectivorous food habits. B. adj. Of or pertaining to an animal of this kind or the order including it. ΘΚΠ the world > animals > mammals > [adjective] > of fossil or extinct types thylacotherian1838 multituberculate1884 tinoceratid1891 synapsidan1903 synapsid1910 symmetrodont1950 1950 Nature 21 Oct. 696/2 The specimen can easily be described as a lower symmetrodont cheek tooth. 1977 A. Hallam Planet Earth 223 Triconodont and symmetrodont mammals died out during the Cretaceous. 1979 R. C. Fox in Fairbridge & Jablonski Encycl. Paleont. 429/2 Symmetrodont molars are highly characteristic; both upper and lower crowns formed simple occlusal triangles... The lower molar triangles are reversed in respect to the uppers and occlusion was alternate in the sense that each molar occluded within the embrasure between two successive molars on the opposite jaw. This entry has not yet been fully updated (first published 1986; most recently modified version published online March 2018). < n.adj.1933
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