Invertebrate Coelomates

Question 1

Protosome Characteristics

Answer 1

Organ System level of organization
All Three Embryonic tissues
Bilateral Symmetry
Tube within a tube body plan
True Coelom/Coelomate
Blastopore forms mouth

Question 2

Phylum Mollusca

Answer 2

Primarily Aquatic
MUSCULAR FOOT, visceral mass, and mantle
Shelled
Three Main Classes:
- Bivalvia (clams and oysters)
- Cephalopoda (octopi and squids)
- Gastropoda (snails and slugs)

Question 3

Phylum Annelida

Answer 3

Earthworms and leeches
Segmented worms
- specialization of parts
Has central nervous system

Question 4

Phylum Arthropoda

Answer 4

Segmented body, head, thorax, abdomen
- cephalothorax is both the head and thorax
Jointed Appendages
Chitinous exoskeleton
Three Classes:
- Arachnida (scorpions and spiders)
- Crustacea (crabs and shrimps)
- Insecta (insects)