Comparing Phyla

Week 5 - 7^th Grade�Life Science

Domain Eukarya

Kingdom Animalia

9 Phyla

1. Porifera
2. Cnidaria
3. Platyhelminthes
4. Nematoda
5. Annelida
6. Mollusca
7. Arthropoda
8. Echinodermata
9. Chordata

Domain Eukarya

Kingdom Animalia

9 Phyla

• Porifera-Sponges
• Cnidaria-Jelly Fish & Sea Anemones
• Platyhelminthes-Flat Worms
• Nematoda-Round Worms
• Annelida-Segmented Worms
• Mollusca-Clams, Snails, Octopus, Squid, and Slugs
• Arthropoda-Bugs, Crabs, and Lobsters
• Echinodermata-Sea stars, sea urchins, and sea cucumbers
• Chordata-Everything Else

Phylum Porifera-Sponges

Phylum Cnidaria-Jellyfish, Coral, and Sea Anemones

Phylum Platyhelminthes-Flatworms

Phylum Nematoda-Round Worms

NOT Earthworms!

Phylum Annelida-Segmented Worms

Earthworms!

(and leeches…)

Phylum Mollusca-Clams, Snails, Octopus, and Squid

Phylum Arthropoda-”Bugs”, Crabs, and Lobsters

“Joint foot”

Phylum Enchinodermata-Sea Stars, Sea Urchins, and Sea Cucumbers

“Spine Skin”

Phylum Chordata-Everything Else (especially vertebrates)

“Chordata” refers to the notochord, which is like a primitive spinal cord

Important traits

Common synapomorphies

Symmetry

Radial: Multiple lines of symmetry (Like a pizza or the spokes of a bicycle)

Bilateral: One line of symmetry

Blastulation

Protostome: The first opening becomes the mouth

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(Most the phyla)

Deuterostome: The first opening becomes the anus

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(Echinoderms and Chordates)

Practice