Chapter 33 - Chapter 33 Invertebrates Book Notes Overview:...

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Chapter 33 Invertebrates Book Notes Overview: Life without a backbone
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o Invertebrates Are animals that lack a backbone Account for 95% of known animal species Sponges – Phylum Porifera o Sponges are sessile and have a porous body and choanocytes o Sponges, phylum Porifera Live in both fresh and marine waters Lack true tissues and organs (Metazoa) o Choanocytes, flagellated collar cells generate a water current through the sponge and ingest suspended food o Most sponges are hermaphrodites meaning that each individual functions as both male and female o Sponges are Suspension feeders capturing food particles suspended in the water that passes through their body Cnidarians – Phylum Cnidaria o All animals except sponges belong to the clade Eumetazoa, the animals with true tissues o Phylum Cnidaria is one of the oldest groups in this clade o Cnidarians have diversified into a wide range of both sessile and floating forms including forms including jellies, corals, and hydras
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Chapter 33 - Chapter 33 Invertebrates Book Notes Overview:...

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