Intertabrae Chart

The Systems of the Animal Kingdom

Listed below are some of the characteristics of the invertebrate phyla for a handy review and study guide.

Phylum Circulatory Respiratory Digestive
Reproductive
Excretory Nervous Skeletal Muscular

Porifera None None
Collar cells and amebocytes

Budding Regeneration, and Gemmules
None None Spicules None

Cnidaria None None Gastrovascular cavity
Budding,Regeneration, Production of sperm and eggs
None Nerve net found in the mesoglea None Muscle cells

Platyhelminthes
None None Mouth, pharynx and a gastrovascular cavity
Regeneration, Hermaphroditic
flame cells Ladder-like nervous system None Muscle cells

Nematoda None None Mouth,intestine, anus Separate sexes excretory tubules and excretory pore Circular brain and several longitudinal nerve cords None Longitudinal muscles

Annelida Closed system Aortic arches Dorsal and ventral blood vessels Skin Mouth,pharynx, esophagus, crop, gizzard, intestine, anus Hermaphroditic Nephridia 2 per segment Ventral nerve cord with a small anterior brain None Longitudinal and circular muscles

Mollusca Open System with a dorsal heart and sinuses Gills see Annelida Sexual Nephridia Brain and ventral nerve cord Some contain shells Anterior and Posterior adductor muscles

Arthropoda
Open system with a dordal heart and sinuses
Gills, Tracheal system, book lungs see Annelida Sexual: hermaphroditic, seperate sexes, some parthenogenic Malpighian tubules, green glands Anterior brain and a ventral nerve cord Exoskeleton made of chitin Complex muscular system.

Phylum	Circulatory	Respiratory	Digestive	Reproductive	Excretory	Nervous	Skeletal	Muscular
Porifera	None	None	Collar cells and amebocytes	Budding Regeneration, and Gemmules	None	None	Spicules	None
Cnidaria	None	None	Gastrovascular cavity	Budding,Regeneration, Production of sperm and eggs	None	Nerve net found in the mesoglea	None	Muscle cells
Platyhelminthes	None	None	Mouth, pharynx and a gastrovascular cavity	Regeneration, Hermaphroditic	flame cells	Ladder-like nervous system	None	Muscle cells
Nematoda	None	None	Mouth,intestine, anus	Separate sexes	excretory tubules and excretory pore	Circular brain and several longitudinal nerve cords	None	Longitudinal muscles
Annelida	Closed system Aortic arches Dorsal and ventral blood vessels	Skin	Mouth,pharynx, esophagus, crop, gizzard, intestine, anus	Hermaphroditic	Nephridia 2 per segment	Ventral nerve cord with a small anterior brain	None	Longitudinal and circular muscles
Mollusca	Open System with a dorsal heart and sinuses	Gills	see Annelida	Sexual	Nephridia	Brain and ventral nerve cord	Some contain shells	Anterior and Posterior adductor muscles
Arthropoda	Open system with a dordal heart and sinuses	Gills, Tracheal system, book lungs	see Annelida	Sexual: hermaphroditic, seperate sexes, some parthenogenic	Malpighian tubules, green glands	Anterior brain and a ventral nerve cord	Exoskeleton made of chitin	Complex muscular system.