animal kingdom. invertebrate animals occupy all terrestrial and aquatic ecosystems 34 phyla we will...
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INVERTEBRATE ANIMALS
Occupy all terrestrial and aquatic ecosystems
34 phyla
We will be studying:1. Sponges and Cnidarians2. Worms3. Molluscs4. Echinoderms5. Arthropods
INVERTEBRATE ANIMALS
1. SPONGES AND CNIDARIANS
SPONGES (PHYLUM PORIFERA)- Marine and freshwater- Asymetrical body plan- 2 cell layers, No tissues- Sessile- Trap food as water passes through internal body
channels
INVERTEBRATE ANIMALS
1. SPONGES AND CNIDARIANS
CNIDARIANS (PHYLUM CNIDARIA)- hydras, jellyfish, sea anemones, corals- Radial body symmetry- 2 cell layers specializing into tissues- Swim and capture prey using stinging tentacles
around the mouth- Food digested in gastrovascular cavity
INVERTEBRATE ANIMALS
1. SPONGES AND CNIDARIANS
CNIDARIANS (PHYLUM CNIDARIA)- 2 body formsa) Polyp: cylindrical, attaches to surfaces, extending tentacles
up and out, wait for preyEx: adult sea anemones, corals, hydras
b) Medusa: flattened, mouthdown form that is not attached, moves passively with currents or by body contractions
Ex: jellyfish
** May have one body form or alternate
INVERTEBRATE ANIMALS
2. WORMS
FLATWORM (PHYLUM PLATYHELMINTHES)- Least complex- Acoelomates, 3 cell layers- Simple nervous system (brain-like density and
eyespot at head end)- Ex: parastic tapworms, flukes, free-living
planarians
INVERTEBRATE ANIMALS
2. WORMS
SEGMENTED WORMS (PHYLUM ANNELIDA)- Long tube-like bodies with ringed segments- Distinct head end- Several organ systems
INVERTEBRATE ANIMALS
3. MOLLUSCS (PHYLUM MOLLUSCA)
- Bilateral symmetry- Mantle, organ filled body, muscular foot, sense
organs- Coelom, 3 cell layers, 2 body openings- Soft body protected with hard shell- 3 classes
a) Class bivalviab) Class Gastropodac) Class Cephalopoda
INVERTEBRATE ANIMALS
3. MOLLUSCS (PHYLUM MOLLUSCA)a) Class bivalvia- Marine and freshwater- Clams, mussles, oysters, scallops- Protected by hinged shell
b) Class Gastropoda- Terrestrial, freshwater and marine- Shelled snails and non-shelled slugs- Coiled shell
INVERTEBRATE ANIMALS
3. MOLLUSCS (PHYLUM MOLLUSCA)
c) Class Cephalopoda- Octopus and squid- Marine- Grasping tentacles allow for propulsion
INVERTEBRATE ANIMALS
4. ECHINODERMS (PHYLUM ECHINODERMATA)
- Sea stars, sea urchins, sea cucumbers, sand dollars
- Marine animals- Radial symmetry- Spiny endoskeleton (internal skeleton of calcium
carbonate), covered in skin- Water vascular system including tube feet