The Porifera and Cnidaria

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Presentation transcript:

The Porifera and Cnidaria

Phylum Porifera

spicules

A Phylogeny of Major Animal Phyla Based on DNA Sequence Data. Choanoflagellates ANIMALIA Porifera Fungi Choanoflagellates Cnidaria ANIMALIA Ctenophora Multicellularity Acoelomorpha LOPHOTROCHOZOA Bilateral symmetry? Rotifera Loss of coelom Platyhelminthes Segmentation Annelida Bilateral symmetry Protostome development Molluska PROTOSTOMES Figure 32.9 A Phylogeny of Major Animal Phyla Based on DNA Sequence Data. BILATERIA ECDYSOZOA Nematoda Coelom, cephalization, CNS Arthropoda Segmentation DEUTEROSTOMES Radial symmetry (in adults) Echinodermata DEUTEROSTOMES Chordata Segmentation

Choanoflagellates compared with sponges

Phylum Cnidaria

A Phylogeny of Major Animal Phyla Based on DNA Sequence Data. Choanoflagellates ANIMALIA Porifera Fungi Choanoflagellates Cnidaria ANIMALIA Ctenophora Multicellularity Acoelomorpha LOPHOTROCHOZOA Bilateral symmetry? Rotifera Loss of coelom Platyhelminthes Segmentation Annelida Bilateral symmetry Protostome development Molluska PROTOSTOMES Figure 32.9 A Phylogeny of Major Animal Phyla Based on DNA Sequence Data. BILATERIA ECDYSOZOA Nematoda Coelom, cephalization, CNS Arthropoda Segmentation DEUTEROSTOMES Radial symmetry (in adults) Echinodermata DEUTEROSTOMES Chordata Segmentation