animals invertebrats
作者：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