单词 | arthrodire |
释义 | arthrodiren. Palaeontology. A member of the extinct order Arthrodira of placoderm fishes, which are known from Devonian fossil deposits and have a bony head-shield that is articulated at the neck to another bony shield covering the upper part of the body. ΚΠ 1897 Amer. Naturalist 31 497 Portions of the cranium and also the dorsal element..are covered by superficial scutes which are incapable of correlation with derm plates in other Arthrodires. 1970 R. M. Black Elements Palaeontol. xvii. 247 Coccosteus..represents a group (the arthrodires) in which the head-shield was hinged to a second shield covering the shoulder region. 2000 Jrnl. Paleontol. 74 129/1 The other fragments show..the presence of at least two other species of medium sized arthrodires. This is a new entry (OED Third Edition, December 2008; most recently modified version published online December 2021). < n.1897 |
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