Title: Invertebrate Animals
1Invertebrate Animals
(MOST Animals -- gt95!)
2Animal Phylogeny
Porifera Cnidaria Platyhelminthes Nematoda Annelid
a Mollusca Arthropoda Echinodermata
Invertebrates
3Porifera (Sponges)
- Simple, ALMOST Colonial
- No Symmetry
- No Gut
- 2 Tissue Layers
- Acoelomate (Spongocoel)
- Sessile filter feeders
4Porifera (Sponges)
5Cnidaria (Jellyfish, Anemone)
- Simple
- Radial Symmetry
- Incomplete Gut Gastrovascular Cavity (GVC)
- 2 tissue Layers
- Acoelomate
6Cnidaria (Jellyfish, Anemone)
- Sessile (Polyp) or Mobile (Medusa) forms
7Cnidaria (Jellyfish, Anemone)
- Carnivores
- Tentacles with stinging cells
- Cnidocytes
8Platyhelminthes (Flatworms)
- Simple
- Bilateral Symmetry
- Incomplete Gut Gastrovascular Cavity (GVC)
- 3 tissue Layers
- Acoelomate
- Protostomes
http//www.biology.ualberta.ca/courses.hp/zool250/
Labs/Lab04/DugesiaCrawling.mov
9Platyhelminthes (Flatworms)
- Incomplete GVC is finely branched.
- Simple Nervous System
- Simple Reproductive System
10Platyhelminthes (Flatworms)
11Nematoda (Smooth Roundworms)
- More Complex
- Bilateral Symmetry
- Complete Gut
- 3 tissue Layers
- Pseudocoelomate
- Protostomes
- Many soil-dwellers
- Many parasites
12Nematoda (Smooth Roundworms)
- More complex Digestive System
- More complex Reproductive System
- No Circulatory system
13Nematoda (Smooth Roundworms)
14Annelida (Segmented Roundworms)
- More Complex
- Bilateral Symmetry
- Complete Gut
- 3 tissue Layers
- Coelomate
- Protostomes
- Many soil-dwellers
- Many marine
- Some parasites
Earthworms
Polychaetes
Leeches
15Annelida (Segmented Roundworms)
- Segmentation ? Specialization
- Basic central nervous system
- Complex reproductive system
- Complex digestive system
- Open circulatory system
- Simple kidney system
16Annelida (Segmented Roundworms)
17Mollusca (Snails, Clams, Squid)
- Even More Complex!
- Bilateral Symmetry (some modified)
- Complete Gut
- 3 tissue Layers
- Coelomate
- Protostomes
- Diverse!
18Mollusca (Snails, Clams, Squid)
- Soft bodies, often with a CaCO4 shell
- Complex systems (digestion, reproductive)
- Open circulatory system
- Simple respiratory system (gills)
- Modified Segmentation ? Specialization
- Foot (musclular, locomotion)
- Visceral Mass (organs, organ systems)
- Mantle (membranous covering shell secretion)
19Mollusca (Snails, Clams, Squid)
- CLASS Gastropoda (Snails, Slugs)
20Mollusca (Snails, Clams, Squid)
- CLASS Bivalvia (Clams, oysters, scallops)
21Mollusca (Snails, Clams, Squid)
- CLASS Cephalopoda (Octopus, Squid)
22Arthropoda (Insects, Crustaceans, Spiders)
- Rather Complex!
- Bilateral Symmetry
- Complete Gut
- 3 tissue Layers
- Coelomate
- Protostomes
- Very Diverse!
23Arthropoda (Insects, Crustaceans, Spiders)
- Hardened Exoskeleton (Protein Chitin)
- Molting to grow
- Jointed Feet
- Segmentation (often modified through fusion)
- Specialization
- Open circulatory system
- Simple respiratory system (gills, book lungs,
tracheal system) - Complex systems (digestion, reproductive)
24Arthropoda
- CLASS Insecta (grasshopper, fly, butterfly,
ladybug, mantis, bee, wasp, etc.)
3 sets of walking appendages
Metamorphosis
15 Orders!
25Arthropoda
- CLASS Arachnida (Spiders, Ticks, Scorpions)
Chelicerae (jaws)
4 sets of walking appendages
26Arthropoda
- CLASS Crustacea (Crabs, Shrimp, Lobsters)
27Echinodermata(Sea Stars, Starfish, Sea Urchins)
- Somewhat Complex
- Radial Symmetry
- Complete Gut
- 3 tissue Layers
- Coelomate
- Deuterostomes
28Echinodermata(Starfish, Sea Urchins)
- Radial Symmetry is secondary
- Almost Radial
- Larvae are bilateral
- Endoskeleton (hardened calcium plates or spines)
- Spiny-skin
- Water Vascular System
- Hydraulic locomotion,feeding, gas exchange
- Complete Gut
- (Seems Incomplete)
29Echinodermata (Starfish, Sea Urchins)
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