BIOLOGY PRESENTATION

Dwi Muktianto (11)

Kukuh Prasetyo (18)

Sabiq Farhan (26)

Yusuf Fajar R (32)

By

http://photography.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/Photography/Images/Content/sea-star-pair-758303-sw.jpg

Echinoderm Classes

–• Multiple arms radiating from central

disk• Tube feet on bottom

• “Starfish”

• Active predators

– feed on bivalves

– use suction cups to pull open the shells with forces of up to 5kg

• The stomach is eversible, and can be partially inserted inside prey’s shell (enzymes but no toxins)

Sea Cucumber

http://www.starfish.ch/Fotos/echinoderms

http://universe-review.ca/I10-82-starfish.jpg

http://www.tolweb.org/Echinodermata

• Complete digestive system

(tubular gut), mouth to anus.

(bottom to top)

• Crinoidia: filter-feed, use cilia

• Asteroidea: Cardiac (evert),

pyloric stomach, digestive

glands

• Urchins: “Aristotle’s lantern”

(masticatory apparatus)

• Holothurians:

suspension/deposit feeders,

use tentacles.