ostracodermn.adj.

Brit.

/ɒˈstrakədəːm/,

/ˈɒstrəkədəːm/, U.S.

/ˈɑstrəkəˌdərm/

Origin: Formed within English, by compounding. Etymons: ostraco- comb. form, -derm comb. form.

Etymology: < ostraco- comb. form + -derm comb. form. In sense A. 1 after scientific Latin Ostracodermi, suborder name (T. Gill Arrangem. Families Fishes (1872) 1). In sense A. 2 after scientific Latin Ostracodermi, subclass name (E. D. Cope 1889, in Amer. Naturalist 23 852). Compare earlier ostracodermous adj.

A. n.

†1. Ichthyology. Any of various armoured plectognath fishes (formerly assigned to the suborder Ostracodermi). Obsolete. rare.Apparently only attested in dictionaries or glossaries.

ΚΠ

1890 Cent. Dict. Ostracoderm, an ostracient fish, as a member of the Ostracodermi; a plectognath of the suborder Ostracodermi.

2. Palaeontology. Any of various jawless fossil fishes having bony plates on the head and front part of the body (formerly assigned to a subclass Ostracodermi of the class Agnatha).

ΘΚΠ

the world > animals > fish > superclass Agnatha > [noun] > member of Ostracodermi (fossil)

ostracophore1895

ostracoderm1898

ostracodermous1925

1898 A. S. Woodward Outl. Vertebr. Palæontol. 5 The simplest Ostracoderms (Heterostraci) occur in the Upper Silurian and Lower Devonian, and exhibit no bone-cells in any part of their dermal armour.

1933 A. S. Romer Vertebr. Paleontol. ii. 24 Almost all are covered with various types of armor, a feature to which the name ‘ostracoderms’ (‘shell-skinned’) is due.

1969 G. M. Bennison & A. E. Wright Geol. Hist. Brit. Isles viii. 182 The jawless Ostracoderms with dorsal shield and granular armour..had made their appearance in the Upper Ludlow Beds.

1993 Guardian 18 Nov. ii. 13/5 Sticking out of the soft limestone bed are part of an ostracoderm (an armour-plated fish up to 20 feet long) [etc.].

B. adj.

†1. Ichthyology. Belonging to the (former) group Ostracodermi of plectognath fishes. Obsolete. rare.Apparently only attested in dictionaries or glossaries.

ΚΠ

1890 Cent. Dict. Ostracoderm,..pertaining to the Ostracodermi.

2. Palaeontology. Of or relating to ostracoderms.

ΘΚΠ

the world > animals > fish > superclass Agnatha > [adjective] > of or relating to Ostracodermi

ostracoderm1891

ostracophorous1893

1891 A. S. Woodward Catal. Fossil Fishes in Brit. Mus. (Nat. Hist.) II. p. xvii The Arachnid theory is based upon a complete misapprehension of the most fundamental points in Ostracoderm skeletal anatomy.

1928 E. Neaverson Stratigr. Palaeontol. xi. 255 The Gedinnian fauna of Belgium is not well known, since it is often represented only by fragments of ostracoderm fish.

1935 Amer. Jrnl. Sci. 229 323 (title) The ostracoderm genus Dartmuthia Patten.

1968 A. S. Romer Procession of Life viii. 148 By that time [sc. early Devonian] higher fish types descended from the ostracoderm stock were already evolving.

1993 Amer. Naturalist 142 762 The divergence of the chondrichythans from the ostracoderm ancestor.

Derivatives

† ostracodermal adj. Obsolete rare = sense A. 1.Apparently only attested in dictionaries or glossaries.

ΚΠ

1890 Cent. Dict. Ostracodermal, same as ostracoderm.

This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022).

单词	ostracoderm
释义	ostracodermn.adj. Brit. /ɒˈstrakədəːm/, /ˈɒstrəkədəːm/, U.S. /ˈɑstrəkəˌdərm/ Origin: Formed within English, by compounding. Etymons: ostraco- comb. form, -derm comb. form. Etymology: < ostraco- comb. form + -derm comb. form. In sense A. 1 after scientific Latin Ostracodermi, suborder name (T. Gill Arrangem. Families Fishes (1872) 1). In sense A. 2 after scientific Latin Ostracodermi, subclass name (E. D. Cope 1889, in Amer. Naturalist 23 852). Compare earlier ostracodermous adj. A. n. †1. Ichthyology. Any of various armoured plectognath fishes (formerly assigned to the suborder Ostracodermi). Obsolete. rare.Apparently only attested in dictionaries or glossaries. ΚΠ 1890 Cent. Dict. Ostracoderm, an ostracient fish, as a member of the Ostracodermi; a plectognath of the suborder Ostracodermi. 2. Palaeontology. Any of various jawless fossil fishes having bony plates on the head and front part of the body (formerly assigned to a subclass Ostracodermi of the class Agnatha). ΘΚΠ the world > animals > fish > superclass Agnatha > [noun] > member of Ostracodermi (fossil) ostracophore1895 ostracoderm1898 ostracodermous1925 1898 A. S. Woodward Outl. Vertebr. Palæontol. 5 The simplest Ostracoderms (Heterostraci) occur in the Upper Silurian and Lower Devonian, and exhibit no bone-cells in any part of their dermal armour. 1933 A. S. Romer Vertebr. Paleontol. ii. 24 Almost all are covered with various types of armor, a feature to which the name ‘ostracoderms’ (‘shell-skinned’) is due. 1969 G. M. Bennison & A. E. Wright Geol. Hist. Brit. Isles viii. 182 The jawless Ostracoderms with dorsal shield and granular armour..had made their appearance in the Upper Ludlow Beds. 1993 Guardian 18 Nov. ii. 13/5 Sticking out of the soft limestone bed are part of an ostracoderm (an armour-plated fish up to 20 feet long) [etc.]. B. adj. †1. Ichthyology. Belonging to the (former) group Ostracodermi of plectognath fishes. Obsolete. rare.Apparently only attested in dictionaries or glossaries. ΚΠ 1890 Cent. Dict. Ostracoderm,..pertaining to the Ostracodermi. 2. Palaeontology. Of or relating to ostracoderms. ΘΚΠ the world > animals > fish > superclass Agnatha > [adjective] > of or relating to Ostracodermi ostracoderm1891 ostracophorous1893 1891 A. S. Woodward Catal. Fossil Fishes in Brit. Mus. (Nat. Hist.) II. p. xvii The Arachnid theory is based upon a complete misapprehension of the most fundamental points in Ostracoderm skeletal anatomy. 1928 E. Neaverson Stratigr. Palaeontol. xi. 255 The Gedinnian fauna of Belgium is not well known, since it is often represented only by fragments of ostracoderm fish. 1935 Amer. Jrnl. Sci. 229 323 (title) The ostracoderm genus Dartmuthia Patten. 1968 A. S. Romer Procession of Life viii. 148 By that time [sc. early Devonian] higher fish types descended from the ostracoderm stock were already evolving. 1993 Amer. Naturalist 142 762 The divergence of the chondrichythans from the ostracoderm ancestor. Derivatives † ostracodermal adj. Obsolete rare = sense A. 1.Apparently only attested in dictionaries or glossaries. ΚΠ 1890 Cent. Dict. Ostracodermal, same as ostracoderm. This entry has been updated (OED Third Edition, September 2004; most recently modified version published online March 2022). < n.adj.1890
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