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II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
a. Phylum Trilobita
- jointed appendages on every segment
- dominated in Paleozoic (600 – 250 mya)
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
b. Phylum Chelicerata
1. Diversity
Eurypterids
(“Sea Scorpions”)
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
b. Phylum Chelicerata
1. Diversity
Eurypertids
Horseshoe “Crabs”
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
b. Phylum Chelicerata
1. Diversity
Scorpions
Arachnids
Spiders
Mites
Ticks
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
b. Phylum Chelicerata
2. Biology
- first terrestrial animals – 450 mya
(scorpion-like)
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
b. Phylum Chelicerata
2. Biology
- first terrestrial animals – 450 mya
- two body segments:
cephalothorax (fusion)
abdomen
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
b. Phylum Chelicerata
2. Biology
- first terrestrial animals – 450 mya
- two body segments:
cephalothorax (fusion)
abdomen
- Fusion of abdominal segments
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
b. Phylum Chelicerata
2. Biology
- first terrestrial animals – 450 mya
- two body segments:
cephalothorax (fusion)
abdomen
- Fusion of abdominal segments
- Gills or “book lungs”
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
c. Phylum Myriapoda
1. Diversity
Pauropods
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
c. Phylum Myriapoda
1. Diversity
Pauropods
Centipedes
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
c. Phylum Myriapoda
1. Diversity
Pauropods
Centipedes
Millipedes
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
c. Phylum Myriapoda
2. Biology
- spiracles for breathing
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
d. Phylum Crustacea
1. Diversity
Remipede
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
d. Phylum Crustacea
1. Diversity
Decapods (Shrimp, Loster, Crabs)
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
d. Phylum Crustacea
1. Diversity
Decapods (Shrimp, Loster, Crabs)
Copepods
Barnacles
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
d. Phylum Crustacea
2. Biology
- three body regions
- appendages modified for different
functions; head for senses (antennae) and feeding; thorax for
locomotion; abdomen for reproduction.
- appendages modified for different
functions; head for senses (antennae) and feeding; thorax for
locomotion; abdomen for reproduction.
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
e. Phylum Hexapoda
1. Diversity
- Collembola
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
e. Phylum Hexapoda
1. Diversity
- Collembola
- Protura
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
e. Phylum Hexapoda
1. Diversity
- Collembola
- Protura
- Insecta
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
e. Phylum Hexapoda
2. Biology
- spiracles
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
e. Phylum Hexapoda
2. Biology
- spiracles
- Fusion of segments into three
regions: head, thorax, abdomen
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
e. Phylum Hexapoda
2. Biology
- spiracles
- Fusion of segments into three
regions: head, thorax, abdomen
- Flight in insects
II. Animal Diversity
b. Ecdysozoans
3. Arthropod Phyla
e. Phylum Hexapoda
3. Why are there SO MANY insect species??
increase probability
of geographical
isolation
- flight: high powers of dispersal
increase probability
of establishing a
population
- tough: exoskeleton resists desiccation
- small: so they are unlikely to get back to the
same place the left.
- fecund: have lots of offspring
II. Animal Diversity
C. Bilateria
1. Protostomes – blastopore forms mouth
a. Lophotrochozoans
b. Ecdysozoans
2. Deuterostomes – blastopore forms anus
a. Echinodermata
b. Hemichordata
c. Chordata
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
a. Echinodermata
1. Diversity
- sea stars
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
a. Echinodermata
1. Diversity
- sea stars
- sea cucumbers
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
a. Echinodermata
1. Diversity
- sea stars
- sea cucumbers
- sea urchins
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
a. Echinodermata
2. Biology
- “biradial symmetry”
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
a. Echinodermata
2. Biology
- “biradial symmetry”
- internal skeleton – calcified plates
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
a. Echinodermata
2. Biology
- “biradial symmetry”
- internal skeleton – calcified plates
- filter feeders (Sea Lily), herbivores
(sea urchins), predators (sea stars).
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
b. Hemichordata – Acorn Worms
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
b. Hemichordata – Acorn Worms
- pharyngeal gill slits
- hollow dorsal nerve tube
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
c. Chordata: Four Key Characters
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
c. Chordata: Four Key Characters
- Pharyngeal Gill Slits
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
c. Chordata: Four Key Characters
- Pharyngeal Gill Slits
- Hollow Dorsal Nerve Tube
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
c. Chordata: Four Key Characters
- Pharyngeal Gill Slits
- Hollow Dorsal Nerve Tube
- Post-anal tail
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
c. Chordata: Four Key Characters
- Pharyngeal Gill Slits
- Hollow Dorsal Nerve Tube
- Post-anal tail
- notochord – a rigid supporting rod
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
c. Chordata: Four Key Characters
1. Urochordata - Tunicates
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
c. Chordata: Four Key Characters
1. Urochordata – Tunicates
- 4 traits as larva
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
c. Chordata: Four Key Characters
1. Urochordata – Tunicates
- 4 traits as larva
- mobile as larva
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
c. Chordata: Four Key Characters
1. Urochordata – Tunicates
- 4 traits as larva
- mobile as larva
- become sedentary
as adults (filter)
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
c. Chordata: Four Key Characters
2. Cephalochordata – Lancelets
II. Animal Diversity
C. Bilateria
2. Deuterostomes – blastopore forms anus
c. Chordata: Four Key Characters
2. Cephalochordata – Lancelets
- 4 traits
- burrowers
- filter feeders