zooid

1 Alcyonaria.—In this sub-class the zooid has very constant anatomical characters, differing in some important respects from the Actinian zooid, which has been taken as a type.

2 All of these zooids remain embedded in a single gelatinous tunic.

3 B, Single zooid and axis of the same magnified. m, Mouth; mf mesenterial filament; ax, axis.

4 The zooid then is, as it were, moulded upon the corallum.

5 They somewhat resemble the feeding zooids, but are destitute of mouths.

6 Every Alcyonarian colony is developed by budding from a single parent zooid.

7 But before this separates off a number of other zooids are formed from a zone of budding which appears between the two first-formed individuals.

8 Although they look, behave and move around like individual organisms, siphonophores are actually floating colonies made up of tiny multicellular organisms called zooids that are attached to one another and cannot survive independently.

9 After division the corallites continue to grow upwards, and their zooids may remain united by a bridge of soft tissue or coenosarc.

10 B, Single zooid with the adjacent soft tissues as seen after removal of the skeleton by decalcification.

11 A given stock only produces zooids of one sex.

12 In the Tubipondae the spicules of the proximal part of the body-wall are fused together to form a firm tube, the corallite, into which the distal part of the zooid can be retracted.

13 In certain hydroids, an imperfect zooid, whose special function is to produce medusoid buds.

14 Each siphonophore is made up of many little "zooids," reports LiveScience.

15 In the order Pseudaxonia the colonies are upright and branched, consisting of a number of short zooids whose proximal ends are imbedded in a coenenchyma containing numerous ramifying solenia and spicules.

16 These zooids have an incurrent and excurrent siphon and use cilia to pump water for feeding, respiration and movement. Using a mucus net, they filter water for small planktonic microorganisms.

17 Buds arise from the edge-zone which already communicate with the cavity of the zooid by the canals.

18 The colony is made of hundreds to thousands of cloned zooids.

19 They resemble and are closely allied to certain families of the Cornulariidae, differing from them only in mode of budding and in the dispostion of the daughter zooids round a central, much-elongated mother zooid.

20 The creatures, made up of individual zooids - small, multicellular organisms - normally reside in warmer waters, like the tropics, and usually don’t travel farther north than the waters off southern California.

1 个体

individual unity individuality polyp hypostasis individualized unitary monad distributive zooidal person unit

2 动物性的

zooidal

3 像动物的

zooidal

4 游动孢子

swarmer zoospore zoosperm planospore zooidal swarm spore

5 动物的

animal creatural zoic

6 动物

animal creatural zoic thing creature beast inhabitant fauna bugger menagerie creatureliness

7 独立个体

zooidal