单词 | nauplius |
释义 | naupliusn. Zoology. The free-swimming larval stage in many crustaceans, characterized by an unsegmented body with a dorsal shield, three pairs of appendages, and a single median eye; a larva in this stage. Frequently attributive.These larvae were at first mistakenly thought to represent a distinct genus, for which the name was introduced by O. F. Müller: see quot. 1836. ΘΚΠ the world > animals > invertebrates > phylum Arthropoda > class Crustacea > [noun] > member of > at larval stage zoea1828 nauplius1869 1836 Penny Cycl. V. 340/2 Some time afterwards..they acquire another pair of feet; they are then the genus Nauplius of the same author [sc. Müller].] 1869 W. S. Dallas tr. F. Müller Facts & Arguments for Darwin 92 The Nauplii [Ger. die Nauplius] of the Cirripedia have to undergo several moults whilst in that form. 1869 W. S. Dallas tr. F. Müller Facts & Arguments for Darwin 84 The Cyclopes of our fresh waters were excluded in the Nauplius-form [Ger. Naupliusform]. 1896 J. W. Kirkaldy & E. C. Pollard tr. J. E. V. Boas Text Bk. Zool. 192 A large number of Crustacea leave the egg in the so-called nauplius-state; as small, compact creatures furnished only with the first and second antennæ and the mandibles. a1933 J. A. Thomson Biol. for Everyman (1934) I. xi. 231 Among the lower crustaceans, such as water-fleas and acorn-shells, the commonest larva is a Nauplius, usually microscopic. 1953 H. Mellanby Animal Life in Fresh Water (ed. 5) vii. 96 The eggs hatch as Nauplii, and six Nauplius and five Copepodid stages are passed through before the animals are adult. 1993 E. N. K. Clarkson Invertebr. Palaeontol. & Evol. (ed. 3) xi. 388/2 The embryo, developing by spiral cleavage, subsequently becomes a nauplius larva. This entry has been updated (OED Third Edition, June 2003; most recently modified version published online June 2022). < n.1869 |
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