Unit 8 Chapter 29 Echinoderms and Invertebrate Chordates

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Presentation transcript:

Unit 8 Chapter 29 Echinoderms and Invertebrate Chordates

What is an Echinoderm? Radially symmetrical, with spiny skin Endoskeletons of calcium carbonate and pincerlike appendages

What is an Echinoderm? Water Vascular System For locomotion, food-getting, and gas exchange Tube feet = tiny suction cups

Diversity of Echinoderms Sea stars Brittle stars

Diversity of Echinoderms Sand dollars Sea urchins

Diversity of Echinoderms Sea cucumbers Sea lilies & feather stars

What is a Chordate? Phylum Chordata includes: Urochordates (Sea Squirts) Cephalochordates (Lancelets) Vertebrates (all vertebrates) Dolphin embryo

What is a Chordate? All Chordates have the following characteristics at some time during their life: Notochord = rod-like structure (replaced by backbone in vertebrates) Dorsal nerve cord = hollow cord (becomes spinal cord in vertebrates) Gill slits (pharyngeal pouches) develop into gills or disappear Tail (develops or disappears)

Invertebrate Chordates Tunicates or sea squirts Have all chordate characteristics as larva, but not as adults

Invertebrate Chordates Lancelets The only chordate to retain all characteristics as an adult

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