Invertebrates

Porifera

Circulatory: None

Digestive: None (Phagocytosis)

Excretory: None

Nervous: None

-Structure and protection from spicules and chemical defense

Cnidaria

Circulatory: None (Diffusion)

Digestive: Simple, Incomplete (1 hole)

Excretory: None

Nervous: Simple Nerve Net

Movement: Hydrostatic Skeleton

Platyhelminthes

Circulatory: None (Diffusion)

Digestive: Incomplete (1 hole) or none

Excretory: Simple proto-nephridia (Flame Cells)

Nervous: Simple or Complex (Cephalization and Eyespots)

Annelids

Circulatory: Closed, Complex (Multiple hearts)

Digestive: Complete (2 holes)

Excretory: Intermediate complexity Nephridia

Nervous: Complex (Cephalization and sometimes eyes)

Movement: Hydrostatic Skeleton

Mollusca

Circulatory: Variable (little to open to closed)

Digestive: Complete (2 holes)

Excretory: Fairly Advanced (Kidneys)

Nervous: Variable, simple to very complex (same with eyes)

Movement: Foot suction of jet propulsion

Arthropods

Circulatory: Open (arteries/veins not connected)

Digestive: Complete (2 holes)

Excretory: Advanced (Malpighian tubes)

Nervous: Advanced (Cephalization)

Nematoda

Circulatory: None (mostly small)

Digestive: Complete (2 holes)

Excretory: Simple

Nervous: Advanced (Cephalization)

Movement: Longitudinal muscles only protection via tough collage cuticle

Echinodermata

Circulatory: Water Vascular System

Digestive: Complete in most taxa

Excretory: None

Nervous: Nerve Ring, sometimes eyes but usually simple

Movement: Tube Feet (Water Vascular)

Echinodermata

“spine skin” -sea stars, sea urchins, sea cucumbers

Nematoda

“thread-like” -roundworm (no segmentation)

Arthropods

“jointed foot” -insects, crabs, spiders

Mollusca

“soft” -snails, squids, mollusks, octopi, clams, scallops

Annelids

“segmented worms” -earthworms

Platyhelminthes

“flatworms”

Cnidaria

diploblast -coral, jellyfish, anemones

Porifera

sponges