Lülijalgsed
Olulised putukate arvukuse
reguleerijad.
Paljud lestalised on
lagundajad.
Ämblikud on toiduks
paljudele loomadele.
Mitmete ämblikulaadsete
mürgist saab toota ravimeid.
Kasutatakse ka inimese
toiduna.
Kasutatud allikad
https://en.wikisource.org/wiki/Popular_Scienc
e_Monthly/Volume_16/April_1880/The_Crayfish
http://www.gutenberg.org/files/39904/39904-
h/39904-h.htm#chapter_vi
https://www.google.ee/search?q=Trilobit
e+drawing&source=lnms&tbm=isch&sa=X&ved
=0ahUKEwjPv9Dzh9raAhWDZFAKHdN7Dr0Q_AUIC
igB&biw=1285&bih=520#imgrc=kYZ5koy37xSK
tM
:
http://www.pensapiens.com/blog-index/2015/1
2/21/an-ode-to-arthropoda
https://www.heartspm.com/fascination-with/sp
annaabi.ee 
