| 释义 |
palæoniscoid, n. and a.
[f. mod.L. name of suborder Palæoniscoidei, f. generic name Palæoniscus (L. Agassiz Recherches sur les Poissons fossiles (1833) II. v. 41), f. palæo- + Gr. ὀνίσκος a sea-fish resembling cod + -oid.]
A. n. A fossil fish belonging to the suborder Palæoniscoidei, a group that includes elongate fishes with heterocercal tails and diamond-shaped scales.
B. adj. Of or pertaining to a fish of this kind.
1895B. Dean Fishes Living & Fossil vii. 166 (caption) Palaeozoic Palaeoniscoid. 1900Nature 20 Sept. 507/2 Both the head and shoulder-girdle are of palæoniscoid type. 1928Palaeobiologica I. 87 (heading) Polypterus, a palaeoniscoid? 1963P. H. Greenwood Norman's Hist. Fishes (ed. 2) iv. 56 A modified palaeoniscoid scale occurs in the superorder Holostei, another group which is best known from extinct forms. 1968A. S. Romer Procession of Life viii. 161 A typical palaeoniscoid was a small, well-streamlined little fish, with thick shiny scales, long jaws with a powerful gape, and..a tail in which the fleshy, scale-covered tip of the body extends upward and backward to the tip of the fin. Ibid., Today there survive only two small groups of palaeoniscoid descendants. 1974D. & M. Webster Compar. Vertebr. Morphol. viii. 162 True ganoid scales occurred in the palaeoniscoid fishes. |