Protostomes
Porifera
Cnidaria
Ctenophora
ANIMALS
Acoelomorpha
LOPHOTROCHOZOA
Rotifera
Platyhelminthes
Annelida
Mollusca
Protostome
development
ECDYSOZOA
Nematoda
Tardigrada
Coelom
Onychophora
Arthropoda
Echinodermata
Chordata
PROTOSTOMES
Bilateral symmetry
Lophophore
Bryozoans
Phylum Rotifera
Click here for video of rotifers
Phylum Platyhelminthes
Beat diffusion by being flat
- Increase size without increasing distance to each cell
Diffusion
Platyhelminthes - Planaria
Platyhelminthes - Planaria
Planarian video here
Phylum Annelida
Hydraulic movement in a tubular animal
Phylum Mollusca
Porifera
Cnidaria
Ctenophora
ANIMALS
Acoelomorpha
LOPHOTROCHOZOA
Rotifera
Platyhelminthes
Annelida
Mollusca
Protostome
development
ECDYSOZOA
Nematoda
Tardigrada
Coelom
Onychophora
Arthropoda
Echinodermata
Chordata
PROTOSTOMES
Bilateral symmetry
Ecdysozoa
Phylum Nematoda
See Nematode movement here
Phylum Arthropoda
2x
Area = 1
Strength = 1
Weight = 1
Area = 4
Strength = 4
Weight = 8
Strength/wt = 1
Strength/wt = 1/2
Exoskeleton like tube
Endoskeleton like rod
Per unit weight, tube is stonger than rod
Generalized arthropod
- Segments
- Exoskeleton
- Ventral nervous system with anterior,
dorsal brain
tagmatization
Tracheal system
- Spiracles
- Trachea
- tracheoles