Phylum Arthropoda

Domain Eukarya Kingdom Animalia Phylum Arthropoda Subphylum ? Class Order Family Genus species

Subphylum Crustacea

copepods, amphipods, isopods, shrimps, crabs, lobsters, barnacles

Subphylum Crustacea – Copepods

- Among the most common animals on earth - Extremely abundant & important in the plankton

Subphylum Crustacea – Barnacles

- How do they feed? - Feathery filtering appendages - Body enclosed by calcareous plates

Subphylum Crustacea – Amphipods

- Compressed form side to side - Live in debris washed ashore, among seaweed, w/in plankton

Alien or Amphipod?

Subphylum Crustacea – Isopods

- Compressed from top to bottom - Found in same areas as amphipods

Subphylum Crustacea – Krill (euphausiids)

- Planktonic, shrimp-like crustaceans - Common in polar waters - Important food source for whales, penguins, fishes

Subphylum Crustacea – Shrimps, Lobsters, Crabs

- Largest group of crustaceans - Decapods (10 legs) - 5 pairs of walking legs (What is the first pair used for?)

Crustacean larvae (babies)

Phylum Echinodermata “spiny skinned”

Water Vascular System and Tube Feet

http://www.imagequest3d.com/cgi-bin/ImageFolio3/imageFolio.cgi?img=&search=tube%20feet&cat=aquatic&bool=and

Domain Eukarya Kingdom Animalia Phylum Echinodermata Class ? ? ? ? Order Family Genus species

Class Asteroidea - seastars

Class Ophiuroidea - brittlestars

Class Echinoidea – sea urchins & sand dollars

Class Holothuroidea – sea cucumbers

Echinoderm Larvae

Seastar Urchin

Brittlestar Sea Cucumber

Which one is a baby: Seastar?

Sea urchin?

Brittlestar?

Sea cucumber?

Phylum Hemichordata

- Link between echinoderms and chordates?? - Larva similar to echinoderms - Dorsal, hollow nerve cord & openings along anterior portion of gut (like chordates)

Phylum Hemichordata

- Link between echinoderms and chordates?? - Larva similar to echinoderms - Dorsal, hollow nerve cord & openings along anterior portion of gut (like chordates)

Phylum Chordata - 3 major groups (subphyla) 2 lack a backbone

1. Dorsal nerve cord

2. Gills slits – openings along front part of gut

3. Notochord – flexible rod for support

4. Post anal tail

Chordate characteristics?

Domain Eukaryota Kingdom Animalia Phylum Chordata Subphylum ? ? Vertebrata Class Order Family Genus species

Subphylum Urochordata (Tunicates)

ascidians, sea squirts, salps, larvaceans

Why are these chordates??

Subphylum Urochordata (Tunicates)

ascidians, sea squirts, salps, larvaceans

Tadpole Larva w/ Chordate Traits

Ascidians (Sea Squirts)

Salps & Larvaceans

Subphylum Cephalochordata

lancelets

Subphylum Vertebrata