Ph. Porifera and Ph. Cnidaria Biology Two DOL 31-33 6/29/2016 I. Phylum Porifera (sponges; “pore bearer”) A. General characteristics 1. simplest animals 2. asymmetric 3. aquatic habitats a. typically marine 4. live alone or in colonies a. often members of reef habitats B. Anatomy 1. 3 cell layers, but lack true tissues a. outer = epidermis 1) covered in ostia a) pores for entry of H 2 O, O 2 & nutrients b. middle = gel layer w/ specialized cells 1) amebocytes (a.k.a. archaeocytes) = transport nutrients, complete digestion 2) spicules = provide shape & support c. inner = choanocytes (a.k.a. collar cells) 1) have flagella that extend inward to help circulate water through sponge
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Ph. Porifera and
Ph. CnidariaBiology Two
DOL 31-33
6/29/2016
I. Phylum Porifera (sponges; “pore bearer”)A. General characteristics