In some Isopods that live as parasites on fish or on other Crustacea, each individual is at first a male, and later becomes a female.
Another large group of parasitic Isopods is the suborder Epicaridea, all the species of which are parasitic on other Crustacea.
At all events, undoubted Isopods make their appearance in rocks of the Secondary Period, and some of those from the Jurassic epoch are not very different in general form from types still existing.
The antennae have no exopodite, although in a few other Isopods a minute vestige is present.
Alfred Giard has described several Amphipods and Isopods which establish themselves on Tunicates.
Other isopods also resort to fishes, and to animals of their own class, but they live as true parasites, and change their form as soon as they have chosen a resting-place.
Most of the parasitic isopods instal themselves in the thoracic cavity under the carapace of a neighbour, and make themselves contented in the small space which remains to them.
If the forms are not so varied among the isopods as elsewhere, many among them present nevertheless the most extraordinary appearance, the most unexpected contour.
The isopods are a large and widely distributed order, varying in size, and are inconspicuous because they cling closely to objects.
From this circumstance they retain their natural shape, and it is seen that they are naturally flattened, with about the same thickness in proportion to length and width as in some of the modern isopods (Serolis, for instance).
Other incidental prey wereisopods in western North America and fish eggs near Vancouver Island.
Other incidental prey were isopods in the North Pacific.
Some Isopods undergo a considerable change immediately before the attainment of sexual maturity.
Ligia forms a connecting link between the woodlice proper and the many Isopods which actually live in the sea.
Fossil Isopods have also been recorded from the Oolite and from the Oligocene (Isle of Wight).
The differences between the Decapods and Isopods in the development of the mesenteron are not inconsiderable, but they are probably to be explained by the relatively larger amount of food-yolk in the latter forms.
The solid yolk in the Isopods on this view represents the primitive mesenteron of Decapods after the yolk has been absorbed by the hypoblast cells.
In all the Isopods which have been carefully studied, there appears before any other organ a provisional structure formed from the epiblast and known as the dorsal organ.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "isopods" in a variety of sentences. We hope that you will now be able to make sentences using this word.
