labyrinthodontadj.n.

Brit.

/ˌlab(ə)ˈrɪnθədɒnt/, U.S.

/ˌlæb(ə)ˈrɪnθəˌdɑnt/

Origin: Formed within English, by compounding. Etymons: labyrinth n., -odont comb. form.

Etymology: < labyrinth n. + -odont comb. form. Compare French labyrinthodonte (1842 or earlier).In the specific sense after either scientific Latin Labyrinthodon, former genus name (see labyrinthodon n.) or Labyrinthodontia, group name (R. Owen, 1860).

Palaeontology.

A. adj.

Having or characterized by teeth with labyrinthine infolding of the dentine and enamel; spec. relating to or designating large fossil amphibians of the group Labyrinthodontia, which includes forms that were transitional between the lobe-finned fishes and all subsequent tetrapods.The Labyrinthodontia have traditionally been treated as a taxonomic subclass, but now that the constituent taxa are known to be paraphyletic it is regarded more as an evolutionary grade.

ΘΚΠ

the world > animals > amphibians > [adjective] > of extinct types

labyrinthodont1841

cheirotherian1855

mastodonsaurian1865

lepospondylous1901

lepospondyl1933

1841 Ann. & Mag. Nat. Hist. 7 211 Mr. Owen concludes..that the Dendrodus..might have approached more nearly than the rest of the class to the Labyrinthodont group of Batrachia.

1876 D. Page Adv. Text-bk. Geol. (ed. 6) xiv. 254 Those labyrinthodont reptiles that come boldly into force in the Permian and Triassic eras.

1958 W. E. Swinton Fossil Amphibians & Reptiles (ed. 2) iv. 20 The Lepospondyls are obviously degenerate and though their skulls are essentially of the Labyrinthodont type their relationship would not seem to be very close.

1997 G. S. Helfman et al. Diversity of Fishes xi. 162/2 Conical teeth with numerous infoldings of the dentine, termed labyrinthodont dentition.

2005 Jrnl. Vertebr. Paleontol. 25 509/1 The marginal..teeth are not labyrinthodont, but the fangs in the palate have a weak labyrinthine infolding at their base.

B. n.

A labyrinthodont amphibian.

ΘΚΠ

the world > animals > amphibians > [noun] > extinct types of > labyrinthodont or rachitome

labyrinthodon1841

labyrinthodont1841

Cheirotherium1855

rachitome1857

rachiotome1859

toad-lizard1899

1841 R. Owen in Trans. Geol. Soc. 2nd Ser. 6 542 The extinct Labyrinthodonts deviated from the Salamanders and other Batrachia in the Crocodilian development and sculpturing of the external and superior bones of the cranium.

1873 J. W. Dawson Story Earth & Man viii. 201 The crocodilian newts or labyrinthodonts of the Carboniferous.

1951 G. R. de Beer Vertebr. Zool. (ed. 2) xvii. 223 In some animals, the body may be entirely covered by an armour of bony plates, as in the Labyrinthodonts, or the armadilloes.

1985 E. H. Colbert Wandering Lands & Animals (new ed.) i. 45 The first labyrinthodonts appeared at the end of the Devonian period, about 340 million years ago.

2001 Independent 23 July i. 11/2 Fifteen skulls of 240-million-year-old extinct amphibian labyrinthodonts were also reported stolen.

This entry has been updated (OED Third Edition, March 2017; most recently modified version published online June 2022).

单词	labyrinthodont
释义	labyrinthodontadj.n. Brit. /ˌlab(ə)ˈrɪnθədɒnt/, U.S. /ˌlæb(ə)ˈrɪnθəˌdɑnt/ Origin: Formed within English, by compounding. Etymons: labyrinth n., -odont comb. form. Etymology: < labyrinth n. + -odont comb. form. Compare French labyrinthodonte (1842 or earlier).In the specific sense after either scientific Latin Labyrinthodon, former genus name (see labyrinthodon n.) or Labyrinthodontia, group name (R. Owen, 1860). Palaeontology. A. adj. Having or characterized by teeth with labyrinthine infolding of the dentine and enamel; spec. relating to or designating large fossil amphibians of the group Labyrinthodontia, which includes forms that were transitional between the lobe-finned fishes and all subsequent tetrapods.The Labyrinthodontia have traditionally been treated as a taxonomic subclass, but now that the constituent taxa are known to be paraphyletic it is regarded more as an evolutionary grade. ΘΚΠ the world > animals > amphibians > [adjective] > of extinct types labyrinthodont1841 cheirotherian1855 mastodonsaurian1865 lepospondylous1901 lepospondyl1933 1841 Ann. & Mag. Nat. Hist. 7 211 Mr. Owen concludes..that the Dendrodus..might have approached more nearly than the rest of the class to the Labyrinthodont group of Batrachia. 1876 D. Page Adv. Text-bk. Geol. (ed. 6) xiv. 254 Those labyrinthodont reptiles that come boldly into force in the Permian and Triassic eras. 1958 W. E. Swinton Fossil Amphibians & Reptiles (ed. 2) iv. 20 The Lepospondyls are obviously degenerate and though their skulls are essentially of the Labyrinthodont type their relationship would not seem to be very close. 1997 G. S. Helfman et al. Diversity of Fishes xi. 162/2 Conical teeth with numerous infoldings of the dentine, termed labyrinthodont dentition. 2005 Jrnl. Vertebr. Paleontol. 25 509/1 The marginal..teeth are not labyrinthodont, but the fangs in the palate have a weak labyrinthine infolding at their base. B. n. A labyrinthodont amphibian. ΘΚΠ the world > animals > amphibians > [noun] > extinct types of > labyrinthodont or rachitome labyrinthodon1841 labyrinthodont1841 Cheirotherium1855 rachitome1857 rachiotome1859 toad-lizard1899 1841 R. Owen in Trans. Geol. Soc. 2nd Ser. 6 542 The extinct Labyrinthodonts deviated from the Salamanders and other Batrachia in the Crocodilian development and sculpturing of the external and superior bones of the cranium. 1873 J. W. Dawson Story Earth & Man viii. 201 The crocodilian newts or labyrinthodonts of the Carboniferous. 1951 G. R. de Beer Vertebr. Zool. (ed. 2) xvii. 223 In some animals, the body may be entirely covered by an armour of bony plates, as in the Labyrinthodonts, or the armadilloes. 1985 E. H. Colbert Wandering Lands & Animals (new ed.) i. 45 The first labyrinthodonts appeared at the end of the Devonian period, about 340 million years ago. 2001 Independent 23 July i. 11/2 Fifteen skulls of 240-million-year-old extinct amphibian labyrinthodonts were also reported stolen. This entry has been updated (OED Third Edition, March 2017; most recently modified version published online June 2022). < adj.n.1841
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