What are the names of the male germ cells in hydra? Whom do they resemble in their structure?

What are the names of the male germ cells in hydra? Whom do they resemble in their structure? what is the name of the female reproductive cell? who does it look like in structure?

The male germ cells in hydras are called spermatozoa. They are similar to the simplest flagellates due to the presence of a tourniquet with which they move.
The female reproductive cell of the hydra is called the egg cell. In its structure, it is similar to an amoeba, as it has pseudopods.