This subkingdom comprises at present such familiar forms as the crinoid, the starfish, and the sea urchin.
All forms of animal life, from the coelenterates to the mammals, follow the same path in their embryological development as far as the gastrula stage, but here their paths widely diverge, those of each subkingdom going their own separate ways.
Classes are so long-lived that most of those which are known from the earliest formations are represented by living forms, and no subkingdom has ever become extinct.
This subkingdom is known by naturalists under the name of the Arthropoda.
The subkingdom of the Arthropoda is again subdivided into six classes.
A class of invertebrate animals belonging to the subkingdom Annuloso.
Sponge is a cellular fibrous structure, produced by marine animals of the humblest type, belonging to the subkingdom Protozoa.
Before concluding this chapter we shall take up the salient points in the geological history of Arthropods which constitute the highest subkingdom of all animals except the Vertebrates.
The subkingdom Molluscoids has been richly represented by both the so-called "sea mosses" and brachiopods.
It is our purpose to bring out the salient features in the history of each subkingdom of animals, beginning with the lowest or simplest, and taking up in turn the higher and higher subkingdoms.
Each little prong once held a tiny individual living graptolite which was a very simple type of animal belonging to the subkingdom called "Coelenterates.
Descending in the scale of animal organization, we come next to the subkingdom RADIÁTA, or that in which the parts are arranged in a radiate manner around a centre.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "subkingdom" in a variety of sentences. We hope that you will now be able to make sentences using this word.
