Invertebrates: Phylogenetic Tree

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Animalia

Chordata

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

Leptocardii

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

Echinodermata

-Bilaterally symmetric as larvae -Use internal canals to move

Asteroidea

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

Echinoidea

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

Arthropoda

-Have a segmented exoskeleton -Have jointed appendages

Arachnida

-Have no antennae or wings -They are carnivorous

Malacostraca

-The head has two antennae -Some are hermaphroditic

Nematoda

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

Chromadorea

-Have a more sophisticated pharynx -Have three esophageal glands

Annelida

-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

Mollusca

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

Gastropoda

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

Bivalvia

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

Brachiopoda

-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

Rotifera

-Have organ systems -Feed on microorganisms suspended in water

Eurotatoria

-Have jaws in the pharynx -Have a digestive tube

Platyhelminthes

-Bilaterally Symmetric -No organs or body cavity

Rhabditophora

-Have no digestive tract -Unsegmented acoelomates

Cnidaria

-Radially Symmetrical -Have a gastrovascular cavity

Anthozoa

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

Scyphozoa

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

Porifera

-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