WARM UP List three adaptations that have developed over time in the chordate phylum that have made members of this group effective predators.

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WARM UP List three adaptations that have developed over time in the chordate phylum that have made members of this group effective predators.

Hemichordates Notes Phylum Chordata

Origin of Chordates Hypothesis 1: Marine Worms Embryonic development switches from protostome to deuterostome Chordate characteristics develop

Origin of Chordates Hypothesis 2: Tadpole Larva Echinoderm larva develops reproductive ability Larva shape becomes chordate body plan

Characteristics of Chordates Notochord Solid, rod-like Movement Postanal tail Propulsion Dorsal nerve cord Hollow Pharynx Gill slits Feeding and respiration

Acorn Worms Deuterostome worms Similar to chordates “Notochord” “Gills” Proboscis, collar, and trunk

Tunicates Sessile filter feeders Siphon water Tadpole larva Gill slits Chordate Siphon water Gill slits

Lancelets Chordate features as adults Filter feeders

WRAP UP How do acorn worms support the hypothesis that chordates developed from marine worms? How do tunicates and especially lancelets, support the hypothesis that chordates developed from a invertebrate larva with reproductive capabilities?