Echinodermata and Hemichordata

• Phylum Echinodermata Class Asteroidea - Sea Stars
• Phylum Echinodermata Class Crinoidea - Sea lilies
• Phylum Echinodermata Class Echinoidea - Sea Urchins, Sand Dollars
• Phylum Echinodermata Class Holothuroidea - Sea cucumbers
• Phylum Echinodermata Class Ophiuroidea - Brittle Stars
• Phylum Hemichordata - Acorn Worms
• Class Asteroidea - Pyloric ceca are digestive glands in arms of star fish
• Class Asterodia - pedicellaria are used to keep starfish free of debris
• Class Asterodia - ampulla are tube feet, used in locomotion.
• Ampulla and Ambulacral ridge

  
• Ambulacral ridge in class asteroida used to move food to the mouth
• Class Asterodia respirate through dermal branchiae (skin gills)
• Class Asterodia - ossicles are underneath the epidermis, and are made of many calcareous plates bound together by connective tissue.

  
• immature starfish

  
• starfish pedicellarae

  
• Bipinnaria larva

  
• Brachiolaria larva

  
• Class Echinoidea - Aristotles lantern is used to concentrate food and is the mouthparts of the urchin

  
• Class Echinoidea - Angel wings are the mouthparts of sand dollars

  A) Angel wings

  
• Test of sea urchins is the spine, made of compact rows
• Class Echinoidea spines of sea urchin are used in defense
• Class Holothuroidea - Sea Cucumbers

  
• Class Ophiuroidea - Brittle Stars
• Class Ophuroidea - Brittle Stars

  
• Phylum Hemichordata - Acorn worms

  
• General Characteristics of Phylum Echinodermata - Water-Vascular system, bilateral larva, pentaradial adult forms
• bipinnaria larva develops into brachiolaria larva
• Acorn worm anatomy

  A) Trunk

  B) Collar

  C)