Animalia

-Lack true tissues
-Suspension feeders

Hexactinellida

-Have a skeleton made of four or six pointed siliceous spikes
-Believed to live anywhere from 15,000 to 23,000 years

-Radially Symmetrical
-Have a gastrovascular cavity

Scyphozoa

-Have four part symmetry
-Have an internal material called mesoglea, which gives it structure (much like a skeleton)

Anthozoa

-Do not have a "medusa" stage in development
-Can reproduce sexually and asexually

-Bilaterally Symmetric
-No organs or body cavity

Rhabditophora

-Have no digestive tract
-Unsegmented acoelomates

-Have organ systems
-Feed on microorganisms suspended in water

Eurotatoria

-Have jaws in the pharynx
-Have a digestive tube

-Live from 3 to more than 30 years
-Only live in the sea

Lingulata

-Have tongue-shaped shells
-The shell is composed of chitin, protein, and calcium phosphate

-Have a soft body
-Have a hard shell used for protection

Bivalvia

-Some attach to surfaces, while some bury themselves underground
-Most have two hinged shells

Gastropoda

-They live almost everywhere (wetlands, forests, rivers, etc.)
-Have shells (snails) or no shells (slugs)

-Have segmented bodies
-Includes both land and marine worms

Polychaeta

-Live in some of the coldest and hottest temperatures
-The head projects over the mouth and contains antennae

-Parasitize plants and animals
-Covered in a touch cuticle on the body

Chromadorea

-Have a more sophisticated pharynx
-Have three esophageal glands

-Have a segmented exoskeleton
-Have jointed appendages

Malacostraca

-The head has two antennae
-Some are hermaphroditic

Arachnida

-Have no antennae or wings
-They are carnivorous

-Bilaterally symmetric as larvae
-Use internal canals to move

Echinoidea

-They are round in shape
-They are covered in spikes

Asteroidea

-They undergo regeneration
-They usually have five segments (legs)

-Classified as invertebrates and vertebrates
-Chordate invertebrates: lancelets and tunicates

Leptocardii

-Have a translucent, fish-like body
-Have no true skeleton