Non-Chordata Identification Table

Symmetry Segmentation in the Body

Mouth and Anus

Flat or Round Body

Exoskeleton and

Appendages

Named example with picture

Porifera None Varies, can be none or can be

separate sponges

Water flow system for

both functions as well as

respiration

Round, but irregular

shape. Stays static so does

not need protrusions

Secrete exoskeletons

Phylum Porifera

Cnidaria Yes perfectly round jelly structure

Flagella like protrusions are

segmented from the jelly

like body

No distinguished

mouth an anus

Rounded top part with

thin flagella protrusions

No skeleton, just water

filled tubes. And of course

flagella like structures

Hydridae Hydra

Platyhelminthes Bilaterial Unsegmented Nutrients pass in through diffusion

Soft, flattened

body

Soft body with no

appendages only a simple

body

Trematoda Aspidogastrea

Annelida The symmetry is between the

front and back, not

either side

Segmented but number of

segmentations can vary

Has separate mouth and

anus

Round body Soft but has small hair-like

protrusions, these are for movement

Clitellata Hirudinea

Mollusca Bilaterial No segmentation

Cavity used for breathing and excretion

Round, soft body

Shell on top, with long

protrusions aiding with movement

Sepioteuthis sepioidea

Arthropoda Bilaterial Has a segmented

body

Has separate mouth and

anus

Not round, but far from

flat body

Has an exoskeleton, and attached protrusions, or 3 pairs of appendages

Arachnida Scorpiones