| Phylum | Level of Organization | Symmetry | Coelom | Segmentation | Digestive System | Circulatory System | Respiratory System | Distinctive Features |
|---|---|---|---|---|---|---|---|---|
| Porifera | Cellular | Various | Absent | Absent | Absent | Absent | Absent | Body with pores and canal system |
| Cnidaria | Tissue | Radial | Absent | Absent | Incomplete | Absent | Absent | Cnidoblasts present |
| Ctenophora | Tissue | Radial | Absent | Absent | Incomplete | Absent | Absent | Comb plates for locomotion |
| Platyhelminthes | Organ/Organ-system | Bilateral | Absent | Absent | Incomplete | Absent | Absent | Flat body,suckers |
| Aschelminthes | Organ-system | Bilateral | Pseudocoelomate | Absent | Complete | Absent | Absent | Often worm-shaped,elongated |
| Annelida | Organ-system | Bilateral | Coelomate | Present | Complete | Present | Present | Metameric segmentation |
| Arthropoda | Organ-system | Bilateral | Coelomate | Present | Complete | Present | Present | Exoskeleton of chitin,jointed appendages |
| Mollusca | Organ-system | Bilateral | Coelomate | Absent | Complete | Present | Present | External shell usually present |
| Echinodermata | Organ-system | Radial | Coelomate | Absent | Complete | Present | Present | Water vascular system |
| Hemichordata | Organ-system | Bilateral | Coelomate | Absent | Complete | Present | Present | Proboscis,collar,and trunk |
| Chordata | Organ-system | Bilateral | Coelomate | Present | Complete | Present | Present | Notochord,dorsal hollow nerve cord,gill slits |
Explore More
| Column $X$ | Column $Y$ |
| $(1)$ Green gland | $(P)$ Mollusca |
| $(2)$ Digestive tract with digestive glands | $(Q)$ Arthropoda |
| $(3)$ Straight or coiled alimentary canal | $(R)$ Hemichordata |
| $(4)$ Straight or $U$-shaped digestive tract | $(S)$ Echinodermata |
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