1 / 15

Phylum E chinodermata

Phylum E chinodermata. Echinodermata means “ spiny skin ” Habitat: all are marine living mainly on the ocean floor. Symmetry: Radial. They change from a free-swimming bilaterally symmetrical larva to a bottom-dwelling adult with radial symmetry

donnan
Download Presentation

Phylum E chinodermata

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Phylum Echinodermata

  2. Echinodermata means “spiny skin” • Habitat: all are marine living mainly on the ocean floor. • Symmetry: Radial

  3. They change from a free-swimming bilaterally symmetrical larva to a bottom-dwelling adult with radial symmetry • They have an endoskeleton that is made up of calcium plates, may include protruding spines

  4. They have small feet called tube feet that aid in movement, feeding, respiration, & excretion. • Do not have circulatory, respiratory, or excretory systems. • They breathe through small finger-like extensions called skin gills. • Have a nervous system but no head or brain.

  5. Reproduction • They have separate sexes. Both release their eggs or sperm into the seawater where fertilization occurs. • They develop into free-swimming larvae that grow and develop into the adult form

  6. Diet • They eat bivalves - clams, oysters and scallops. They use the powerful suction of their tube feet to pull open the shells of their prey. • They feed by pushing their stomach out of their mouths and into the open clam. • The stomach secretes its powerful digestive enzymes right into the clam and begins digesting it while it continues to hold the shell open.

  7. Class Asteroidea(“star-like”)

  8. About 1,500 living species of starfish occur on the seabed in all the world's oceans, from the tropics to subzero polar waters • Most can regenerate damaged parts or lost arms and they can shed arms as a means of defense. • Because of this ability to digest food outside the body, starfish can hunt prey much larger than their mouths. • Their diets include clams, oysters, arthropods, and small fish.

  9. Class Echinoidea“hedgehoglike”

  10. Sand dollars and Sea Urchins • The skeleton is almost always made up of tightly interlocking plates that form a rigid structure called test • The mouth is provided with five hard teeth arranged in a circlet, forming an apparatus known as Aristotle’s lantern. • For protection they have barbs on their long spines that are sometimes venomous

  11. Class Holothuroidea

  12. sea cucumbers, are an abundant and diverse group of worm-like and usually soft-bodied echinoderms • While support in most echinoderms is from the skeletal structure, in sea cucumbers, thick sheets of body wall muscles provide support.

  13. Feeding • tentacles around the mouth sweep up sediment from the water

  14. Class Crinoidea

  15. They include: • Sea lilies • Feather stars • Crinoidea are sessile • they have long stalks that attach to rocks or to the ocean floor • feather stars eventually detach themselves • Sticky tube feet that are at the end of each arm catch food and serve as a respiratory surface.

More Related