| 释义 |
ostracoderm, n. and a.|ˈɒstrəkəʊdɜːm|
[a. mod.L. sub-class name Ostracodermi (E. D. Cope 1889, in Amer. Naturalist XXIII. 852), f. Gr. ὀστρακόδερµος hard-shelled.]
A. n. A small, primitive, fossil fish belonging to the group formerly designated the sub-class Ostracodermi.
B. adj. Of or pertaining to this group of fossils. So ˌostracoˈdermal a., ˌostracoˈdermous a. (Mayne Expos. Lex. 1857), ˌostracoˈdermatous a. (Syd. Soc. Lex.).
1891A. S. Woodward Catal. Fossil Fishes in Brit. Mus. (Nat. Hist.) II. p. xvii, The Arachnid theory is based upon a complete misapprehension of the most fundamental points in Ostracoderm skeletal anatomy. 1898A. S. Woodward Vertebr. Palæont. 5 The simplest Ostracoderms (Heterostraci) occur in the Upper Silurian and Lower Devonian, and exhibit no bone-cells in any part of their dermal armour. 1933A. S. Romer Vertebr. Paleont. ii. 24 Almost all are covered with various types of armor, a feature to which the name ‘ostracoderms’ (‘shell-skinned’) is due. 1935Amer. Jrnl. Sci. CCXXIX. 323 (title) The ostracoderm genus Dartmuthia Patten. 1968A. S. Romer Procession of Life viii. 148 By that time [sc. early Devonian] higher fish types descended from the ostracoderm stock were already evolving. 1969Bennison & Wright Geol. Hist. Brit. Isles viii. 182 The jawless Ostracoderms with dorsal shield and granular armour..had made their appearance in the Upper Ludlow Beds. |