| 单词 |
acrita |
| 释义 |
‖ acrita, n. pl. Zool.|ˈækrɪtə|
A singular form is acritan.
[mod.L., a. Gr. ἄκριτα, pl. neut. of ἄκριτος undistinguishable, sc. animalia.]
A name given by MacLeay to a division of the animal kingdom, comprehending the Infusoria, the Polypes, and some of the Intestina; so called from the want of a distinct nervous system. Adopted in 1835 by Owen for a series of the Radiated animals.
1835Kirby Habits & Inst. Anim. I. iv. 149 [Infusories also called] Acrita or indiscernibles. 1835Owen in Todd Cycl. s.v., The Acrita have been termed Protozoa, as being on the first step of animal organization. 1837Whewell Induct. Sc. III. xvii. vii. §2. 450 Some naturalists have doubted whether these zoophytes are not referrible to two types (acrita or polypes, and the true radiata), rather than to one. 1879Chambers Encycl. s.v. Zoology, The lowest animals, in which no trace of a nervous system has been discovered, have been formed into a separate division of the animal kingdom, under the names Acrita and Protozoa. |
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