cleithrumn.

/ˈklʌɪθrəm/

Forms: Plural cleithra.

Etymology: modern Latin (C. Gegenbaur 1895, in Morphol. Jahrb. XXIII. 1), < Greek κλεῖθρον bar for closing a door.

Zoology.

A dermal bone in the pectoral arch of some fishes and amphibia.

ΘΚΠ

the world > animals > animal body > general parts > constituent materials > [noun] > dermal bone in pectoral arch

cleithrum1896

1896 Zool. Rec. 1895 Pisces 15 The bone termed clavicula in Fishes is not homologous with that of higher Vertebrates... The two bones are now called clavicula and cleithrum.

1910 Encycl. Brit. XIV. 262/2 The primitive pectoral girdle..becomes in the Teleostomes..replaced functionally by a secondary shoulder girdle formed of superficially placed membrane bones (supraclavicular and cleithrum or ‘clavicle’).

1910 T. J. Parker & W. A. Haswell Text-bk. Zool. (ed. 2) II. 302 There is also, on each side, a bone called the cleithrum, connected with the corresponding clavicle: there is..reason for thinking this to be homologous with the bone..called clavicle in Teleostomi.

1956 A. S. Romer Osteol. Reptiles vii. 298 The cleithrum, however, is an element which tended toward rapid reduction, even in early reptiles.

This entry has not yet been fully updated (first published 1972; most recently modified version published online June 2018).

单词	cleithrum
释义	cleithrumn. /ˈklʌɪθrəm/ Forms: Plural cleithra. Etymology: modern Latin (C. Gegenbaur 1895, in Morphol. Jahrb. XXIII. 1), < Greek κλεῖθρον bar for closing a door. Zoology. A dermal bone in the pectoral arch of some fishes and amphibia. ΘΚΠ the world > animals > animal body > general parts > constituent materials > [noun] > dermal bone in pectoral arch cleithrum1896 1896 Zool. Rec. 1895 Pisces 15 The bone termed clavicula in Fishes is not homologous with that of higher Vertebrates... The two bones are now called clavicula and cleithrum. 1910 Encycl. Brit. XIV. 262/2 The primitive pectoral girdle..becomes in the Teleostomes..replaced functionally by a secondary shoulder girdle formed of superficially placed membrane bones (supraclavicular and cleithrum or ‘clavicle’). 1910 T. J. Parker & W. A. Haswell Text-bk. Zool. (ed. 2) II. 302 There is also, on each side, a bone called the cleithrum, connected with the corresponding clavicle: there is..reason for thinking this to be homologous with the bone..called clavicle in Teleostomi. 1956 A. S. Romer Osteol. Reptiles vii. 298 The cleithrum, however, is an element which tended toward rapid reduction, even in early reptiles. This entry has not yet been fully updated (first published 1972; most recently modified version published online June 2018). < n.1896
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