Animals P by: Geoffrey LaPage Published by ... - PSSurvival.com

CHAPTER
TWO
‘nds of Parasitic Animals
.~-ase ’ kinds of animals’ means, so far as this chapter
ed, the zoological classification of the parasitic aniith
which this book deals. They belong, as indeed most
sitic animals also do, to five only of the major
groups (Phyla) into which the Animal Kingdom is divided.
These phyla are:
1. The single&led Protozoa, (figs. I, 6,7,43,49), which are
distinguished from bacteria and viruses by the fact that their
bodies have attained what is called the cetlular grade of
organization. Their bodies, that is to say, are cells, a cell being
pseudopodium
food vacuol
, ectoplasm
endopiasm
yyw
nucleus
Fig. I. Amoeba prvfNs, a common non-parasitic
amoeba found in ponds and streams. An example
of the single-celled Protozoa
a unit of protoplasm governed by a structure called its
nucleus, which contains a specialized material called chromatin.
The nucleus governs the life of the cell and the cell cannot
live without it. The bodies of all the higher animals and
plants are made up of cells, but the body of each of the species