Simple booklets can be made for each of the eight invertebrate types - simplify research for your zoology shelf with these little two-sided booklets. Just print page 1 and 2 back to back, 3 and 4 back to back, and so on. They can then be folded and made into booklets. Open size is 8 1/2 x 11 for each. 16 total pages. Annelid, Arthropod, Cnidaria, Echinoderm, Mollusk, Nematode, Platyhelminth, and Poriferan.