Registration numbers must be not less than three inches (3) in height and the. documented name must be in 4-inch letters. Spaces or hyphens should be equal to the. width of a letter other than I or a number other than 1. On vessels so configured that a.
Sponge Animation: Spicules. Spicules are microscopic structures of hard crystal material with fantastic shapes unique to the different species of sponge. They are part of the skeleton that helps give the sponge its shape.
Sclerocytes are the cells responsible for forming the structural supports of the sponge, known as spicules. They come in a variety of shapes and the basis of their composition is what further divides the phylum into three classes of sponges.n fact, the vast number of pores in a sponge's body is actually where the phylum derives its name from; Porifera literally means 'bearing pores.'.