Phylum Echinodermata
Symmetry Radial symmetry
Movement

Water vascular system that using water pressured for suction in the tube feet.
Support

Small hard plates beneath the epidermis.
Body Covering

Epidermis
Nutrition/ Digestion

Nutrition: Clams and oysters
Digestion: The stomach secretes enzymes to liqife the food so it can be absorded and transported to the digestive glands.
Respiration

Gases exchange through the gills on the coelom.
Circulation (open/closed)

Open.
Excretion

Excretion occurs the same way Respiration does, through the gills on the coelom.
Response/
Nervous System

A nerve cirlce around the mouth and ties to the radial nerves that go to each ray.
Reproduction

Reproduction is sexual. They send sperm and eggs into the water and they unite.
Classes (list examples) Asteroidea: Starfish

Echinoderoida: Sea urchin

Holpthuroidea: Sea cucumbers

Ophuroidea: Brittle stars and basket stars

Crinoidea: Sea lillies and feather stars
Phylum Arthropoda
Subphylum Crustacea Arthropoda
Subphylum Chelicerata
Symmetry Bilateral symmetry Bilateral symmetry
Movement

Legs Legs
Support

Exoskeleton Exoskeleton
Body Covering

Tough exoskeleton made of chitin Exoskeleton
Nutrition/ Digestion

Nutrition: Anything edible.
Digestion: Fine particles are sent to the digestive glands while course particles and indigestable material pass through the anus and are excreted. Nutrition: Insects.
Digestion: Food is transported to the digestive gland, where it is stored for furture use.
Respiration

Blood travels through the thin gills and realeases carbon dioxide while absorbing oxygen. Book lungs. Oxygen and carbon dioxide are exchanged through the page-like folds in the spider abdomen. Also, some spiders have tracheaes that take oxygen straight to tissues.
Circulation (open/closed)

Open.
Excretion

Crayfish excrete waste through the anus.
Response/
Nervous System

Eyes, antennae and antennules. At the bottom of the antennule is a statocyst which it uses for balance. Pedipalps
Reproduction

Crayfish reproduce sexually. The female stores the sperm until the spring. Spiders reproduce sexually. The male places a tiny sperm filled web sac in his pedipalps. The male then