echino = “spiny” dermis = “skin”
DESCRIPTION
Echino = “spiny” Dermis = “skin”. Some different echinoderms. Unifying Characteristics. Spiny Skin Internal Skeleton – “ endoskeleton ” Water vascular system Muscular tube feet (suction cup feet) Pentaradia Symmetry 5 rays of symmetry. Water Vascular System. - PowerPoint PPT PresentationTRANSCRIPT
Echino = “spiny”Dermis = “skin”
Some different echinoderms
Unifying CharacteristicsSpiny SkinInternal Skeleton – “endoskeleton”
Water vascular system
Muscular tube feet (suction cup feet)
Pentaradia Symmetry5 rays of symmetry
Water Vascular System
Madreporite - sieve-like opening to the water vascular system
Water Vascular SystemFunctions:
RespirationRing & Radial CanalsTube Feet
CirculationRing & Radial Canals
MovementTube Feet
Tube FeetEach tube foot is basically a suction cup, muscles pull up the centre of the cup causing suction
Many feet working together can exert huge force, allowing “walking” and attacking
Groups of EchinodermsSea Urchins and Sand Dollars
Grazers and DetrivoresSolid plates protect internal organs
Brittle StarsFilter feeders and DetrivoresSlender/Flexible arms – detach and distract
Sea CucumbersDetrivoresEviscerate themselves as defence!
Sea StarsPredatoryRegenerative if dismembered!
Sea Lilies and Feather StarsFilter FeedersFeather dusters of the sea
Sea Urchins and Sand DollarsGrazers and DetrivoresSolid plates protect internal organs
Brittle StarsFilter feeders and DetrivoresSlender/Flexible arms – detach and distract
Sea CucumbersDetrivoresEviscerate themselves as defence!
Sea StarsPredatoryRegenerate if dismembered!
Sea Lilies and Feather StarsFilter FeedersFeather dusters of the sea