animals invertebrats
by Llorenç Martí Turró
1. not body protection
1.1. worm
1.2. sponge
1.3. meduse
2. artropods
2.1. insects
2.2. aracnids
2.3. custracis
2.4. mirapods
3. presents
3.1. body protection
3.1.1. whith
3.1.1.1. pell dura
3.1.1.2. closca
3.1.1.2.1. moluscs
3.1.1.3. espines o plaques
3.1.1.3.1. equinoderms