单词 | palaeoniscoid |
释义 | palaeoniscoidadj.n. Palaeontology. A. adj. Of, relating to, or characteristic of a large group of extinct actinopterygian fishes with heterocercal tails, mainly of Palaeozoic times (thought to be related to the modern sturgeons and paddlefishes); spec. designating the diamond-shaped ganoid scales characteristic of these fishes. ΘΚΠ the world > animals > fish > miscellaneous types > [adjective] > of extinct types placoganoid1859 ganocephalous1865 palaeoniscoid1881 the world > animals > fish > class Osteichthyes or Teleostomi > subclass Actinopterygii > [adjective] > belonging to family Palaeoniscidae > of or relating to member of palaeoniscoid1963 1881 A. Geikie in Nature 3 Nov. 2/1 A Palæoniscoid fish showing a condition of squamation almost identical with that of Polyodon. 1900 Nature 20 Sept. 507/2 Both the head and shoulder-girdle are of palæoniscoid type. 1946 Q. Rev. Biol. 21 59/1 We need not enter into the bewildering details of the palaeoniscoid radiation.., but will simply note such characters as the customary presence of thick and shiny scales of the true ganoid type.., and of a shark-like heterocercal tail. 1963 P. H. Greenwood Norman's Hist. Fishes (ed. 2) iv. 56 A modified palaeoniscoid scale occurs in the superorder Holostei. 1988 Nature 23 June 769/1 The fossil assemblage includes..elasmobranch, palaeoniscoid, and acanthodian scales, and other fragmentary vertebrate remains. B. n. A palaeoniscoid fish; spec. one of the suborder Palaeoniscoidei. ΘΚΠ the world > animals > fish > class Osteichthyes or Teleostomi > subclass Actinopterygii > [noun] > infraclass Neopterygii > member of family Palaeoniscoidei (fossil) palaeoniscid1883 palaeoniscoid1895 1895 B. Dean Fishes Living & Fossil vii. 166 (caption) Palaeozoic Palaeoniscoid. 1968 A. S. Romer Procession of Life viii. 161 A typical palaeoniscoid was a small, well-streamlined little fish, with..a tail in which the fleshy, scale-covered tip of the body extends upward and backward to the tip of the fin. 1986 A. S. Romer & T. S. Parsons Vertebr. Body (ed. 6) iii. 58 In the Paleozoic the ray-finned fishes were represented by abundant genera of Chondrostei known as palaeoniscoids. This entry has been updated (OED Third Edition, March 2005; most recently modified version published online March 2022). < adj.n.1881 |
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