1 / 9

Phylum Echinodermata

Phylum Echinodermata. The Echinoderms (‘spiny skin’). pentaradially symmetrical (bilateral in larvae) Composed of ~6000 living species Since the skeleton is composed of living tissue they have an endoskeleton made of ossicles (calcium carbonate plates)

alcina
Télécharger la présentation

Phylum Echinodermata

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 The Echinoderms (‘spiny skin’)

  2. pentaradially symmetrical (bilateral in larvae) • Composed of ~6000 living species • Since the skeleton is composed of living tissue they have an endoskeleton made of ossicles (calcium carbonate plates) • Echinoderms have a water-vascular system: • Fluid-filled hydraulic system (controls all the tube feet), also used in gas exchange and circulation • Water enters the water-vascular system through a sieve-like plate called the madreporite • All systems of an echinoderm radiate from the center • Capable of regeneration

  3. Gas exchange: through the skin, may have gills • Circulation: open within the coelom (body cavity) • Excretion: through the skin, gills, and anus • Digestion/feeding: complete digestive system, stomach can be pushed out of body to digest food • Reproduction: sexual, can be hermaphroditic • Response to environment: no advanced eyes but sea cucumber can release sticky intestines when threatened • Movement: water-vascular system (tube feet) • Tube foot: used for locomotion • Like a network of plungers and straws combined, working in concert they move the individual slowly • Individually they are weak but as a team they are very strong!

  4. Sea star anatomy:

  5. Composed of 5 extant classes: Asteroidea, sea stars

  6. Composed of 5 extant classes: Holothuroidea • Sea cucumbers

  7. Composed of 5 extant classes: Echinoidea • Urchins and Sand Dollars

  8. Composed of 5 extant classes: Crinoidea • Feather stars

  9. Composed of 5 extant classes: Ophiuroidea • Brittle Stars

More Related