pro-ostracumn.

Brit.

/(ˌ)prəʊˈɒstrək(ə)m/, U.S.

/ˌproʊˈɑstrək(ə)m/

Inflections: Plural pro-ostraca.

Forms: 1800s pro-östracum, 1800s– pro-ostracum.

Origin: A borrowing from Greek, combined with an English element. Etymons: pro- prefix², Greek ὄστρακον.

Etymology: < pro- prefix² + ancient Greek ὄστρακον ostracon n., with remodelling of the ending after Latin neuter nouns in -um.

Palaeontology.

An anterior prolongation of the guard or rostrum of a belemnite or other fossil cephalopod, usually long and flat.

ΘΚΠ

the world > life > biology > organism > fossil > [noun] > particular parts of

ostracite1601

horse-head1708

nucleus1734

orthoceras1734

orthoceratite1734

alveolus1747

volutite1802

strombite1811

helicite1828

turbinite1828

phragmocone1843

pro-ostracum1864

orthoceratoid1885

nema1901

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Cephalopoda > [noun] > member of > parts of > anterior prolongation of fossil

pro-ostracum1864

1864 T. H. Huxley in Figures & Descr. Brit. Org. Remains (Mem. Geol. Surv. U.K.: Monogr.) II. 3 As the part which commonly goes by the name of ‘pen’ in the Belemnite..corresponds to only a part of the structure already known as the ‘pen’ in recent Cephalopoda, I shall endeavour to avoid ambiguity, by using for it the appellation of pro-ostracum.

1872 H. A. Nicholson Man. Palæontol. xxvi. 297 The form of the ‘pro-ostracum’ varies greatly in different cases, and it affords important characters in the discrimination of specific and generic forms in the Belemnitidæ.

1958 J. E. Morton Molluscs xi. 205 The belemnoid shell had three parts: a small chambered phragmocone corresponding to the whole nautiloid shell, a solidly calcified rostrum which is the cigar-shaped part usually found fossil, and, extending forward, a broad shield, the pro-ostracum.

1993 E. N. K. Clarkson Invertebr. Palaeontol. & Evol. (ed. 3) viii. 246/2 The third component of the belemnite shell is the pro-ostracum: a long, flat, expanded tongue projecting forwards and presumably covering the anterior part of the body.

Derivatives

pro-ˈostracal adj. rare of, relating to, or of the nature of a pro-ostracum.

ΚΠ

1890 Cent. Dict. Proöstracal, forming or formed by the proöstracum; of or pertaining to a proöstracum.

1944 Amer. Midland Naturalist 32 763 Unfortunately he does not discuss the validity of the proostracal features by which von Bulow-Trunner characterized the Aulacoceratidae.

This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022).

单词	pro-ostracum
释义	pro-ostracumn. Brit. /(ˌ)prəʊˈɒstrək(ə)m/, U.S. /ˌproʊˈɑstrək(ə)m/ Inflections: Plural pro-ostraca. Forms: 1800s pro-östracum, 1800s– pro-ostracum. Origin: A borrowing from Greek, combined with an English element. Etymons: pro- prefix², Greek ὄστρακον. Etymology: < pro- prefix² + ancient Greek ὄστρακον ostracon n., with remodelling of the ending after Latin neuter nouns in -um. Palaeontology. An anterior prolongation of the guard or rostrum of a belemnite or other fossil cephalopod, usually long and flat. ΘΚΠ the world > life > biology > organism > fossil > [noun] > particular parts of ostracite1601 horse-head1708 nucleus1734 orthoceras1734 orthoceratite1734 alveolus1747 volutite1802 strombite1811 helicite1828 turbinite1828 phragmocone1843 pro-ostracum1864 orthoceratoid1885 nema1901 the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Cephalopoda > [noun] > member of > parts of > anterior prolongation of fossil pro-ostracum1864 1864 T. H. Huxley in Figures & Descr. Brit. Org. Remains (Mem. Geol. Surv. U.K.: Monogr.) II. 3 As the part which commonly goes by the name of ‘pen’ in the Belemnite..corresponds to only a part of the structure already known as the ‘pen’ in recent Cephalopoda, I shall endeavour to avoid ambiguity, by using for it the appellation of pro-ostracum. 1872 H. A. Nicholson Man. Palæontol. xxvi. 297 The form of the ‘pro-ostracum’ varies greatly in different cases, and it affords important characters in the discrimination of specific and generic forms in the Belemnitidæ. 1958 J. E. Morton Molluscs xi. 205 The belemnoid shell had three parts: a small chambered phragmocone corresponding to the whole nautiloid shell, a solidly calcified rostrum which is the cigar-shaped part usually found fossil, and, extending forward, a broad shield, the pro-ostracum. 1993 E. N. K. Clarkson Invertebr. Palaeontol. & Evol. (ed. 3) viii. 246/2 The third component of the belemnite shell is the pro-ostracum: a long, flat, expanded tongue projecting forwards and presumably covering the anterior part of the body. Derivatives pro-ˈostracal adj. rare of, relating to, or of the nature of a pro-ostracum. ΚΠ 1890 Cent. Dict. Proöstracal, forming or formed by the proöstracum; of or pertaining to a proöstracum. 1944 Amer. Midland Naturalist 32 763 Unfortunately he does not discuss the validity of the proostracal features by which von Bulow-Trunner characterized the Aulacoceratidae. This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022). < n.1864
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