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Invertebrate Animals

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Invertebrate Animals (MOST Animals -- 95%!) Animal Phylogeny Porifera (Sponges) Simple, ALMOST Colonial No Symmetry No Gut 2 Tissue Layers Acoelomate ( Spongocoel ... – PowerPoint PPT presentation

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Title: Invertebrate Animals


1
Invertebrate Animals
(MOST Animals -- gt95!)
2
Animal Phylogeny
Porifera Cnidaria Platyhelminthes Nematoda Annelid
a Mollusca Arthropoda Echinodermata
Invertebrates
3
Porifera (Sponges)
  • Simple, ALMOST Colonial
  • No Symmetry
  • No Gut
  • 2 Tissue Layers
  • Acoelomate (Spongocoel)
  • Sessile filter feeders

4
Porifera (Sponges)
5
Cnidaria (Jellyfish, Anemone)
  • Simple
  • Radial Symmetry
  • Incomplete Gut Gastrovascular Cavity (GVC)
  • 2 tissue Layers
  • Acoelomate

6
Cnidaria (Jellyfish, Anemone)
  • Sessile (Polyp) or Mobile (Medusa) forms

7
Cnidaria (Jellyfish, Anemone)
  • Carnivores
  • Tentacles with stinging cells
  • Cnidocytes

8
Platyhelminthes (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
9
Platyhelminthes (Flatworms)
  • Incomplete GVC is finely branched.
  • Simple Nervous System
  • Simple Reproductive System

10
Platyhelminthes (Flatworms)
  • Tapeworms

11
Nematoda (Smooth Roundworms)
  • More Complex
  • Bilateral Symmetry
  • Complete Gut
  • 3 tissue Layers
  • Pseudocoelomate
  • Protostomes
  • Many soil-dwellers
  • Many parasites

12
Nematoda (Smooth Roundworms)
  • More complex Digestive System
  • More complex Reproductive System
  • No Circulatory system

13
Nematoda (Smooth Roundworms)
14
Annelida (Segmented Roundworms)
  • More Complex
  • Bilateral Symmetry
  • Complete Gut
  • 3 tissue Layers
  • Coelomate
  • Protostomes
  • Many soil-dwellers
  • Many marine
  • Some parasites

Earthworms
Polychaetes
Leeches
15
Annelida (Segmented Roundworms)
  • Segmentation ? Specialization
  • Basic central nervous system
  • Complex reproductive system
  • Complex digestive system
  • Open circulatory system
  • Simple kidney system

16
Annelida (Segmented Roundworms)
17
Mollusca (Snails, Clams, Squid)
  • Even More Complex!
  • Bilateral Symmetry (some modified)
  • Complete Gut
  • 3 tissue Layers
  • Coelomate
  • Protostomes
  • Diverse!

18
Mollusca (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)

19
Mollusca (Snails, Clams, Squid)
  • CLASS Gastropoda (Snails, Slugs)

20
Mollusca (Snails, Clams, Squid)
  • CLASS Bivalvia (Clams, oysters, scallops)

21
Mollusca (Snails, Clams, Squid)
  • CLASS Cephalopoda (Octopus, Squid)

22
Arthropoda (Insects, Crustaceans, Spiders)
  • Rather Complex!
  • Bilateral Symmetry
  • Complete Gut
  • 3 tissue Layers
  • Coelomate
  • Protostomes
  • Very Diverse!

23
Arthropoda (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)

24
Arthropoda
  • CLASS Insecta (grasshopper, fly, butterfly,
    ladybug, mantis, bee, wasp, etc.)

3 sets of walking appendages
Metamorphosis
15 Orders!
25
Arthropoda
  • CLASS Arachnida (Spiders, Ticks, Scorpions)

Chelicerae (jaws)
4 sets of walking appendages
26
Arthropoda
  • CLASS Crustacea (Crabs, Shrimp, Lobsters)

27
Echinodermata(Sea Stars, Starfish, Sea Urchins)
  • Somewhat Complex
  • Radial Symmetry
  • Complete Gut
  • 3 tissue Layers
  • Coelomate
  • Deuterostomes

28
Echinodermata(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)

29
Echinodermata (Starfish, Sea Urchins)
30
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