rudistadj.n.

Brit.

/ˈruːdɪst/, U.S.

/ˈrudɪst/

Forms: also with capital initial.

Origin: A borrowing from French. Etymon: French rudistes.

Etymology: < French rudistes, plural noun ( Lamarck Hist. nat. des animaux sans vertèbres (1819) VI. i. 230) < either French rude or classical Latin rudis uneven, rough (for both, see rude adj.) + -iste -ist suffix, with reference to the roughness or irregularity of the shells. Compare scientific Latin rudista , specific name (Lamarck 1819), Rudista , family name ( J. E. Gray Synopsis Contents Brit. Mus. (ed. 21, 1823) 62), German Rudisten (plural), (1838 or earlier). Compare Rudistae n.

Palaeontology.

A. adj.

Of, relating to, or characteristic of the order Hippuritoida (or Rudistes) of extinct bivalve molluscs having elongate shells, found in marine deposits of the Jurassic and Cretaceous periods. rare before 20th cent.Cretaceous forms are notable for their asymmetric shells, with a flattened lid above a conical lower valve. Colonies of these sessile animals trapped sediments to produce extensive reefs.

ΚΠ

1845 C. Lyell in Q. Jrnl. Geol. Soc. 1 60 In the collection of Mr. Conrad, from Alabama, I saw a species of Hippurite..which I believe is the only example of any fossil of the Rudist family derived from the cretaceous rocks of North America.

1954 Jrnl. Paleontol. 28 623/1 He applied the name ‘Plum Road Formation’ to the earlier rudist limestones of Trinidad.

1978 Nature 26 Oct. 779/2 Future editions could be improved by the inclusion of a few famous foreign examples such as the Burgess Shale fauna and a rudist reef association.

2003 M. F. Zagrarni et al. in E. Gili et al. North Afr. Cretaceous Carbonate Platform Syst. 111 Each sequence starts with bioclastic limestones rich in rudist debris.

B. n.

A fossil mollusc of the order Hippuritoida (or Rudistes); a rudistid.

ΘΚΠ

the world > life > biology > organism > fossil > [noun] > types of

astroite1610

belemnite1646

mussel-stone1660

scallop-stone1668

trochite1676

conchite1677

ophiomorphite1677

pectinite1677

worm-stone1677

musculite1681

serpent-stone1681

sugar-plum1681

glossopetraa1684

ague shell1708

forket1708

mytilite1727

grit1748

phytolithus1761

fairy beads1767

fairy fingers1780

fairy arrow1794

gryphite1794

ram's horn1797

hysterolite1799

tubulite1799

thunder-pick1801

celleporite1808

ceraunite1814

seraph1822

serpulite1828

coprolite1829

subfossil1831

pencil1843

trigonellite1845

buccinite1852

rudist1855

guide fossil1867

witch's cradle1867

coccolith1868

fairy cheeses1869

discolith1871

Portland screw1871

spiniferite1872

cyatholith1875

cryptozoon1883

sabellite1889

palaeospecies1895

homoeomorph1898

rudistid1900

megafossil1932

scolecodont1933

macrofossil1937

hystrichosphere1955

palynomorph1961

acritarch1963

molecular fossil1965

mitrate1967

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Pelecypoda or Conchifera > [noun] > section Siphonida > integro-pallialia > family Hippuritidae > member of

hippurite1798

spherulite1834

radiolite1835

rudist1855

rudistid1900

1855 D. T. Ansted in Orr's Circle Sci.: Inorg. Nature 106 Besides the Rudists, of which the hippurite and crania are good examples, there are numerous chambered shells.

1933 Proc. Geologists' Assoc. 44 379 The way was opened for the remarkable series of evolutionary changes shown by the Rudists.

1969 G. M. Bennison & A. E. Wright Geol. Hist. Brit. Isles xiv. 332 The coral-like Rudists are important, forming reef environments in Tethys.

2005 Nature 27 Oct. p. xi/1 Rudists are extinct bivalves that lived in warm, shallow oceans at low latitudes; some developed bizarre, occasionally large shells.

This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022).

单词	rudist
释义	rudistadj.n. Brit. /ˈruːdɪst/, U.S. /ˈrudɪst/ Forms: also with capital initial. Origin: A borrowing from French. Etymon: French rudistes. Etymology: < French rudistes, plural noun ( Lamarck Hist. nat. des animaux sans vertèbres (1819) VI. i. 230) < either French rude or classical Latin rudis uneven, rough (for both, see rude adj.) + -iste -ist suffix, with reference to the roughness or irregularity of the shells. Compare scientific Latin rudista , specific name (Lamarck 1819), Rudista , family name ( J. E. Gray Synopsis Contents Brit. Mus. (ed. 21, 1823) 62), German Rudisten (plural), (1838 or earlier). Compare Rudistae n. Palaeontology. A. adj. Of, relating to, or characteristic of the order Hippuritoida (or Rudistes) of extinct bivalve molluscs having elongate shells, found in marine deposits of the Jurassic and Cretaceous periods. rare before 20th cent.Cretaceous forms are notable for their asymmetric shells, with a flattened lid above a conical lower valve. Colonies of these sessile animals trapped sediments to produce extensive reefs. ΚΠ 1845 C. Lyell in Q. Jrnl. Geol. Soc. 1 60 In the collection of Mr. Conrad, from Alabama, I saw a species of Hippurite..which I believe is the only example of any fossil of the Rudist family derived from the cretaceous rocks of North America. 1954 Jrnl. Paleontol. 28 623/1 He applied the name ‘Plum Road Formation’ to the earlier rudist limestones of Trinidad. 1978 Nature 26 Oct. 779/2 Future editions could be improved by the inclusion of a few famous foreign examples such as the Burgess Shale fauna and a rudist reef association. 2003 M. F. Zagrarni et al. in E. Gili et al. North Afr. Cretaceous Carbonate Platform Syst. 111 Each sequence starts with bioclastic limestones rich in rudist debris. B. n. A fossil mollusc of the order Hippuritoida (or Rudistes); a rudistid. ΘΚΠ the world > life > biology > organism > fossil > [noun] > types of astroite1610 belemnite1646 mussel-stone1660 scallop-stone1668 trochite1676 conchite1677 ophiomorphite1677 pectinite1677 worm-stone1677 musculite1681 serpent-stone1681 sugar-plum1681 glossopetraa1684 ague shell1708 forket1708 mytilite1727 grit1748 phytolithus1761 fairy beads1767 fairy fingers1780 fairy arrow1794 gryphite1794 ram's horn1797 hysterolite1799 tubulite1799 thunder-pick1801 celleporite1808 ceraunite1814 seraph1822 serpulite1828 coprolite1829 subfossil1831 pencil1843 trigonellite1845 buccinite1852 rudist1855 guide fossil1867 witch's cradle1867 coccolith1868 fairy cheeses1869 discolith1871 Portland screw1871 spiniferite1872 cyatholith1875 cryptozoon1883 sabellite1889 palaeospecies1895 homoeomorph1898 rudistid1900 megafossil1932 scolecodont1933 macrofossil1937 hystrichosphere1955 palynomorph1961 acritarch1963 molecular fossil1965 mitrate1967 the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Pelecypoda or Conchifera > [noun] > section Siphonida > integro-pallialia > family Hippuritidae > member of hippurite1798 spherulite1834 radiolite1835 rudist1855 rudistid1900 1855 D. T. Ansted in Orr's Circle Sci.: Inorg. Nature 106 Besides the Rudists, of which the hippurite and crania are good examples, there are numerous chambered shells. 1933 Proc. Geologists' Assoc. 44 379 The way was opened for the remarkable series of evolutionary changes shown by the Rudists. 1969 G. M. Bennison & A. E. Wright Geol. Hist. Brit. Isles xiv. 332 The coral-like Rudists are important, forming reef environments in Tethys. 2005 Nature 27 Oct. p. xi/1 Rudists are extinct bivalves that lived in warm, shallow oceans at low latitudes; some developed bizarre, occasionally large shells. This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022). < adj.n.1845
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