phylum arthropoda - instruction2.mtsac.eduinstruction2.mtsac.edu/jkido/biology 20/lecture...
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Phylum Arthropoda
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Domain Eukarya Kingdom Animalia Phylum Arthropoda Subphylum ? Class Order Family Genus species
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Subphylum Crustacea
copepods, amphipods, isopods, shrimps, crabs, lobsters, barnacles
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Subphylum Crustacea – Copepods
- Among the most common animals on earth - Extremely abundant & important in the plankton
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Subphylum Crustacea – Barnacles
- How do they feed? - Feathery filtering appendages - Body enclosed by calcareous plates
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Subphylum Crustacea – Amphipods
- Compressed form side to side - Live in debris washed ashore, among seaweed, w/in plankton
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Alien or Amphipod?
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Subphylum Crustacea – Isopods
- Compressed from top to bottom - Found in same areas as amphipods
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Subphylum Crustacea – Krill (euphausiids)
- Planktonic, shrimp-like crustaceans - Common in polar waters - Important food source for whales, penguins, fishes
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Subphylum Crustacea – Shrimps, Lobsters, Crabs
- Largest group of crustaceans - Decapods (10 legs) - 5 pairs of walking legs (What is the first pair used for?)
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Crustacean larvae (babies)
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Phylum Echinodermata “spiny skinned”
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Water Vascular System and Tube Feet
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Domain Eukarya Kingdom Animalia Phylum Echinodermata Class ? ? ? ? Order Family Genus species
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Class Asteroidea - seastars
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Class Ophiuroidea - brittlestars
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Class Echinoidea – sea urchins & sand dollars
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Class Holothuroidea – sea cucumbers
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Echinoderm Larvae
Seastar Urchin
Brittlestar Sea Cucumber
Which one is a baby: Seastar?
Sea urchin?
Brittlestar?
Sea cucumber?
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Phylum Hemichordata
- Link between echinoderms and chordates?? - Larva similar to echinoderms - Dorsal, hollow nerve cord & openings along anterior portion of gut (like chordates)
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Phylum Hemichordata
- Link between echinoderms and chordates?? - Larva similar to echinoderms - Dorsal, hollow nerve cord & openings along anterior portion of gut (like chordates)
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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?
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Domain Eukaryota Kingdom Animalia Phylum Chordata Subphylum ? ? Vertebrata Class Order Family Genus species
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Subphylum Urochordata (Tunicates)
ascidians, sea squirts, salps, larvaceans
Why are these chordates??
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Subphylum Urochordata (Tunicates)
ascidians, sea squirts, salps, larvaceans
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Tadpole Larva w/ Chordate Traits
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Ascidians (Sea Squirts)
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Salps & Larvaceans
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Subphylum Cephalochordata
lancelets
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Subphylum Vertebrata
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