† placoganoidadj.n.

Origin: Formed within English, by compounding. Etymons: placo- comb. form, ganoid n.

Etymology: < placo- comb. form + ganoid n. Compare scientific Latin Placoganoidei, division name ( R. Owen, 1861 or earlier).

Palaeontology. Obsolete.

A. adj.

Of or relating to the former division Placoganoidei of fossil fishes having the body covered with bony plates (now included in the Placodermi); placoderm.

ΘΚΠ

the world > animals > fish > miscellaneous types > [adjective] > of extinct types

placoganoid1859

ganocephalous1865

palaeoniscoid1881

1859 R. Owen in Encycl. Brit. XVII. 124/2 The placoganoid and ganoid, heterocercal and notochordal fishes of the Devonian.

1891 Amer. Naturalist 25 137 They consist of an immense number of separate plates of placoganoid fishes and many fragments of the calcified covering of the notochord, of a form provisionally referred to the Elasmobranchii.

B. n.

A fossil fish of the former division Placoganoidei; a placoderm.

ΘΚΠ

the world > animals > fish > miscellaneous types > [noun] > miscellaneous fossil or extinct types

trachynote1848

acanthodian1852

placoganoid1863

ganocephalan1865

osteolepiform1955

1863 J. D. Dana Man. Geol. vii. 276 Placoganoids, having the body covered with plates instead of scales.

1872 W. S. Symonds Rec. Rocks vii. 254 During the latter part of the Silurian epoch the..Placoganoids make their appearance.

1886 Amer. Naturalist 20 1030 It was on the presence of the carapace and plastron of these forms that Owen established his order of Placoganoids.

Derivatives

† placoganoidean adj. and n. Obsolete rare Apparently only attested in dictionaries or glossaries.

ΚΠ

1890 Cent. Dict. Placoganoidean.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online June 2021).

单词	placoganoid
释义	† placoganoidadj.n. Origin: Formed within English, by compounding. Etymons: placo- comb. form, ganoid n. Etymology: < placo- comb. form + ganoid n. Compare scientific Latin Placoganoidei, division name ( R. Owen, 1861 or earlier). Palaeontology. Obsolete. A. adj. Of or relating to the former division Placoganoidei of fossil fishes having the body covered with bony plates (now included in the Placodermi); placoderm. ΘΚΠ the world > animals > fish > miscellaneous types > [adjective] > of extinct types placoganoid1859 ganocephalous1865 palaeoniscoid1881 1859 R. Owen in Encycl. Brit. XVII. 124/2 The placoganoid and ganoid, heterocercal and notochordal fishes of the Devonian. 1891 Amer. Naturalist 25 137 They consist of an immense number of separate plates of placoganoid fishes and many fragments of the calcified covering of the notochord, of a form provisionally referred to the Elasmobranchii. B. n. A fossil fish of the former division Placoganoidei; a placoderm. ΘΚΠ the world > animals > fish > miscellaneous types > [noun] > miscellaneous fossil or extinct types trachynote1848 acanthodian1852 placoganoid1863 ganocephalan1865 osteolepiform1955 1863 J. D. Dana Man. Geol. vii. 276 Placoganoids, having the body covered with plates instead of scales. 1872 W. S. Symonds Rec. Rocks vii. 254 During the latter part of the Silurian epoch the..Placoganoids make their appearance. 1886 Amer. Naturalist 20 1030 It was on the presence of the carapace and plastron of these forms that Owen established his order of Placoganoids. Derivatives † placoganoidean adj. and n. Obsolete rare Apparently only attested in dictionaries or glossaries. ΚΠ 1890 Cent. Dict. Placoganoidean. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online June 2021). < adj.n.1859
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