Rudistaen.

Brit.

/ruːˈdɪstiː/, U.S.

/ruˈdɪsti/

Origin: A borrowing from Latin. Etymon: Latin Rudistae.

Etymology: < scientific Latin Rudistae, family name ( H. G. Bronn System der urweltlichen Konchylien (1824) 33) < French rudistes , plural noun (see rudist adj.).

Palaeontology. Now rare.

With plural agreement. Bivalve molluscs of the extinct order Hippuritoida (or Rudistes); rudist bivalves.

ΚΠ

1838 Penny Cycl. XII. 250/1 The structure of the rudista has been studied by M. Ch. Des Moulins and M. Deshayes.]

1856 Amer. Jrnl. Sci. 72 239 What remains approaches nearer to the genus Sphærulites than to any other of the Rudistæ of which I have seen specimens or figures.

1890 Mem. Boston Soc. Nat. Hist. IV. 322/1 The Rudistæ are conical or cup-shaped Pelecypods with a superficially marked radial symmetry.

1903 A. Geikie Text-bk. Geol. (ed. 4) II. 1199 In the north of France, Belgium, and England, the singular molluscan family of the Rudistæ (Hippuritidæ and Radiolitidæ) appears only occasionally and sporadically.

1965 Science 25 June 1699/1 Among the benthonic ‘shallow-water’ forms, the Rudistae are conspicuous as a large group which became extinct at the end of the Mesozoic.

1984 F. El-Baz Geol. Egypt 17 The basal member of the Rudistae beds overlying the ‘Sandstone Series’ is the ‘Coquina bed’.

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

单词	rudistae
释义	Rudistaen. Brit. /ruːˈdɪstiː/, U.S. /ruˈdɪsti/ Origin: A borrowing from Latin. Etymon: Latin Rudistae. Etymology: < scientific Latin Rudistae, family name ( H. G. Bronn System der urweltlichen Konchylien (1824) 33) < French rudistes , plural noun (see rudist adj.). Palaeontology. Now rare. With plural agreement. Bivalve molluscs of the extinct order Hippuritoida (or Rudistes); rudist bivalves. ΚΠ 1838 Penny Cycl. XII. 250/1 The structure of the rudista has been studied by M. Ch. Des Moulins and M. Deshayes.] 1856 Amer. Jrnl. Sci. 72 239 What remains approaches nearer to the genus Sphærulites than to any other of the Rudistæ of which I have seen specimens or figures. 1890 Mem. Boston Soc. Nat. Hist. IV. 322/1 The Rudistæ are conical or cup-shaped Pelecypods with a superficially marked radial symmetry. 1903 A. Geikie Text-bk. Geol. (ed. 4) II. 1199 In the north of France, Belgium, and England, the singular molluscan family of the Rudistæ (Hippuritidæ and Radiolitidæ) appears only occasionally and sporadically. 1965 Science 25 June 1699/1 Among the benthonic ‘shallow-water’ forms, the Rudistae are conspicuous as a large group which became extinct at the end of the Mesozoic. 1984 F. El-Baz Geol. Egypt 17 The basal member of the Rudistae beds overlying the ‘Sandstone Series’ is the ‘Coquina bed’. This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022). < n.1856
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