Chordate features - PowerPoint PPT Presentation

Phylum Hemichordata (The ‘acorn worms’)

Phylum Hemichordata (The ‘acorn worms’). Also called acorn worms after the nut-shaped proboscis (p482 ) Worm-like benthic marine deuterotomes Not ancestral to chordates, but a sister group Similar lifestyle to annelids, deposit feeder

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Chordates

Chordates. Chordates are Deuterostomes. Protostome vs. Deuterostome. Echinoderms are sister group with chordates. Bilateral symmetry Deuterostome lineage. Four Distinct Chordate Characteristics. Notochord Single tubular, dorsal nerve chord Pharyngeal pouches Post-anal tail. Notochord.

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