Download Animal Bio 3

Diversity: The invertebrates 1
Chapter 33
Diversity of animal groups
(in thousands of species)
Calcarea and Silicea
the sponges





tissue level organisation
no obvious symmetry
Calcium or Silica spicules as "skeleton"
suspension feeders
spongocoel body cavity with osculum opening
Eumetazoa
Cnidaria







Two forms:
polyp and medusa
Radial symmetry
nematocysts to capture prey
blind digestive tract
nerve net
diploblastic (no mesoderm)
Aurelia swimming
Cnidaria

Hydrozoans: colonial polyps
Portuguese man-of-war
Cnidaria

Scyphozoans: Jellies and sea nettles
Cnidaria

Anthozoans: sea anemones, corals
Colonial
polyps
w secreted
hard
skeletons
Cnidaria

Cubozoans: Box jellies
Where would you put this one?
Cubozoa (box jelly)
Anthozoa (Anenomes/corals)
Scyphozoa (Jellyfish, Sea nettles)
Hydrozoa (man-of-war)
Where would you put this one?
Only colonial group with
skeletal parts is the
anthozoans.
Sea Pens
Lophotrochozoans






Bilateral symmetry
acoelomates and coelomates
many have lophophore
many have trochophore larvae
Most diverse body forms:
Groups: flatworms, rotifers,
ectoprocts, brachiopods, molluscs
and annelids
Lophotrochozoans
Many have Lophophore

Ciliated tentacles surround mouth
and guide food into mouth
Ectoproct
Colonial lophophorate
Brachiopod
Hinged shell; lamp shells
Lophotrochozoans
Platyhelminthes

Turbellarians: free-living flat worms
Bilateral symmetry
Blind digestive tract
Nervous sytem
Triploblastic
acoelomate
Lophotrochozoans
Platyhelminthes

Turbellarians: free-living flat worms
Bilateral symmetry
Blind digestive tract
Nervous system
Triploblastic
acoelomate
Lophotrochozoa
Platyhelminthes


Turbellaria: free living
Cestoda: parasitic tape worms
Parasitic lifestyle
loss of nervous system,
digestive system,
no circulatory system,
"scolex" anterior segment
Lophotrochozoa
Platyhelminthes
Turbellaria
 Cestoda
 Trematoda:
endoparasitic flukes

Schistosoma sp.: blood parasites
responsible for sleeping
sickness
Lophotrochozoa
Platyhelminthes




Turbellaria
Cestoda
Trematoda
Mongenea: ectoparasitic on fish
"Gill flukes"
1 mm
fao.org
Lophotrochozoa
Rotifera
Rotifers are (have)…





microscopic
pseudocoelomates
some all-female species
ciliated mouth
complete digestive tract (anus! +
mouth)
Lophotrochozoa
Lophophorates: Ectoprocta and Brachiopoda


Ectoprocts: colonial, with
lophophores
Brachiopods: two valves but
dorsal/ventral unlike molluscs (L/R)
Lophotrochozoa
Mollusca
Molluscs have…
Bilateral symmetry
Complete dig. tract
Coelom
Open circulatory system
Nervous system
Nephridium for excretion
Gills for gas exchange
mantle secretes shell(s)
rasping tongue "radula"
Lophotrochozoa
Molluscs


Chitons (Polyplacophora)
Gastropods (Gastropoda)
DSCN2491.AVI
Lophotrochozoa
Molluscs




Squid swim + color change
http://www.youtube.com/watch?
v=OauXCp8l3QI
Chitons (Polyplacophora)
Gastropods (Gastropoda)
Bivalves (Bivalvia)
Cephalopods (Cephalopoda)
Lophotrochozoa
Annelida
Annelids, the
segmented worms
All are free-living
Some are blood suckers
Bilateral symmetry
Coelom
Complete digestive tract
w crop and gizzard
Closed circulatory system
Nervous system
Metanephridia for excretion

Earthworms (Oligochaeta)
Lophotrochozoa
Annelids



Earthworms (Oligochaeta)
Clam worms (Polychaeta)
Leeches (Hirundinia)
Polychaetes have parapodia
for locomotion and gas
exchange
Hirundinians use blood
meal to fuel reproduction
Next: Ecdysozoans



Defined by ecdysis, shedding of
external cuticle.
means of growth
metamorphosis
Lobster:
http://www.youtube.com/watch?v=ffo37DlH5DM&feature=related
Spider:
http://www.youtube.com/watch?v=2CONWvddogc&feature=fvwrel