Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Biol 11 Lesson 5 April 15 - Ch. 29 Echinodermata

1,770 views

Published on

  • Be the first to comment

Biol 11 Lesson 5 April 15 - Ch. 29 Echinodermata

  1. 1. Homework from last class: <ul><li>Complete the Phylum Facebook project </li></ul><ul><li>Read Ch. 29-1 Echinodermata </li></ul>
  2. 2. Phylum Echinodermata: Echinoderms Chapter 29:Echinodermata pp. 637-644
  3. 3. BBC Life: Time Lapse of Sea Stars <ul><li>http://www.youtube.com/watch?v=HG17TsgV_qI </li></ul>
  4. 4. <ul><li>Phylum Echinodermata </li></ul><ul><li>- echino = “spiny”, dermis = “skin” </li></ul><ul><li>Radial symmetry (often pentaradial) </li></ul><ul><ul><li>However, larvae have bilateral symmetry </li></ul></ul><ul><li>3 cell layers (ectoderm, endoderm, mesoderm) </li></ul><ul><li>Internal skeleton (endoskeleton) – plates of CaCO 3 </li></ul><ul><li>Water vascular system with tube feet </li></ul><ul><li>All marine </li></ul><ul><li>Very ancient group unlike those </li></ul><ul><li>of any other living group </li></ul>Introduction to Echinoderms
  5. 5. <ul><li>Echinoderms appear to be related to chordates (vertebrates). </li></ul><ul><li>Scientists think this because: </li></ul><ul><li>Echinoderm larvae are similar to certain chordate larvae. </li></ul><ul><li>Echinoderms have an endoskeleton (not exoskeleton). </li></ul><ul><li>Their pattern of embryonic development is same as for chordates ( radial cleavage – anus develops before mouth ) </li></ul><ul><ul><li>Mollusk, annelid, and arthropod embryos undergo spiral cleavage - mouth develops first. </li></ul></ul>
  6. 6. Classes of Echinoderms <ul><ul><li>1) Class Asteroidea: ex: star fish (aka sea stars) </li></ul></ul><ul><ul><li>Often pentaradial, usually predatory </li></ul></ul><ul><ul><li>Creep along using tube feet </li></ul></ul><ul><ul><li>2) Class Ophuroidea: ex: brittle stars </li></ul></ul><ul><ul><ul><li>Largest group </li></ul></ul></ul><ul><ul><ul><li>Often pentaradial </li></ul></ul></ul><ul><ul><ul><li>Filter feeders or detritus feeders </li></ul></ul></ul><ul><ul><ul><li>Flexible arms </li></ul></ul></ul><ul><ul><li>3) Class Echinoidea: ex: sea urchins, sand dollars </li></ul></ul><ul><ul><li>Some with protective spines </li></ul></ul><ul><ul><li>Usually grazers (eat algae) </li></ul></ul>
  7. 7. Classes of Echinoderms <ul><ul><li>4) Class Holothuroidea: ex: sea cucumbers </li></ul></ul><ul><ul><li>Usually detritus feeders (aka scavengers) </li></ul></ul><ul><ul><li>Radial symmetry </li></ul></ul><ul><ul><li>Often live in ‘herds’ on ocean floor </li></ul></ul><ul><ul><li>5) Class Crinoidea: ex: sea lilies and feather stars </li></ul></ul><ul><ul><li>Long, feathery arms </li></ul></ul><ul><ul><li>Sessile </li></ul></ul><ul><ul><li>Filter feeders </li></ul></ul><ul><ul><li>Rare today but lots of fossils of them </li></ul></ul>
  8. 8. Form and Function of Echinoderms <ul><ul><ul><li>Representative member: sea star </li></ul></ul></ul><ul><ul><ul><li>Digestive system: </li></ul></ul></ul><ul><ul><ul><li>Starfish pry open prey (ex: bivalves) with their tube feet, then flip stomach inside out into the prey and secrete enzymes to digest the tissue. Then they suck their stomach back in. </li></ul></ul></ul><ul><ul><ul><li> oral surface (location of mouth)  is on bottom </li></ul></ul></ul><ul><ul><ul><li> aboral surface (location of anus)  is on top </li></ul></ul></ul><ul><ul><ul><li>Scavengers (ex: sea cucumbers) </li></ul></ul></ul><ul><ul><ul><li>Filter feeders (ex. sea lillies) </li></ul></ul></ul>
  9. 9. <ul><ul><ul><li>Respiratory system: </li></ul></ul></ul><ul><ul><ul><li>Tube feet for O 2 /CO 2 exchange </li></ul></ul></ul><ul><ul><ul><li>Some species have “skin gills” </li></ul></ul></ul><ul><ul><ul><li>Circulatory and Excretory systems: </li></ul></ul></ul><ul><ul><ul><li>No separate systems for these (tube feet and skin gills are all over the body and take care of O 2 /CO 2 exchange and metabolic waste removal </li></ul></ul></ul><ul><ul><ul><ul><li>Nutrients (food) are distributed by digestive glands , not by blood (there is no blood ) </li></ul></ul></ul></ul>Sea star tube feet Adult sea star internal anatomy
  10. 10. <ul><ul><ul><li>Nervous system: </li></ul></ul></ul><ul><ul><ul><li>Primitive </li></ul></ul></ul><ul><ul><ul><li>No head </li></ul></ul></ul><ul><ul><ul><li>Nerve ring surrounds mouth; radial nerves in arms </li></ul></ul></ul><ul><ul><ul><li>Sea stars have eyespots at tip of each arm </li></ul></ul></ul><ul><ul><ul><li>Statocysts (to tell which side is up) </li></ul></ul></ul>
  11. 11. <ul><ul><ul><li>Musculoskeletal system: </li></ul></ul></ul><ul><ul><ul><li>Instead of muscles, sea stars have a unique water vascular system (hydraulics) </li></ul></ul></ul><ul><ul><ul><li>Water vascular system consists of: </li></ul></ul></ul><ul><ul><ul><li>ring canal: forms a circle around digestive system </li></ul></ul></ul><ul><ul><ul><li>radial canals: canals which extend into each arm </li></ul></ul></ul><ul><ul><ul><li>tube feet: suction-cuplike structures connected to the water vascular system </li></ul></ul></ul><ul><ul><ul><li>madreporite (sieve plate): opening used to filter water into the water vascular system </li></ul></ul></ul><ul><ul><ul><li>(see p. 639) </li></ul></ul></ul><ul><ul><ul><li>Sea star endoskeleton is composed of protective plates made of CaCO 3 (for protection , not involved in movement). </li></ul></ul></ul><ul><ul><ul><li>Some echinoderms can walk around on their arms (ex: brittle stars) or crawl (ex. sea cucumbers) </li></ul></ul></ul>
  12. 12. <ul><ul><ul><li>Reproductive system: </li></ul></ul></ul><ul><ul><ul><li>Usually separate sexes </li></ul></ul></ul><ul><ul><ul><li>“ Broadcast method” - sexual reproduction </li></ul></ul></ul><ul><ul><ul><li>Regeneration – asexual reproduction </li></ul></ul></ul><ul><ul><ul><ul><li>Many species can regrow lost parts </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Sea Star Renegeration </li></ul></ul></ul></ul><ul><ul><ul><ul><li>http://www.youtube.com/watch?v=f7cXeWxxfD4 </li></ul></ul></ul></ul>
  13. 13. <ul><li>Sea stars control many populations (they are important predators) </li></ul><ul><li>Sea urchins often control algae populations </li></ul><ul><ul><li>Both sea stars and sea urchins have been known to upset the ecology of an area </li></ul></ul><ul><ul><li>Sea urchins are used in embryological research (large eggs) </li></ul></ul><ul><ul><li>Drug research (ex. anti-viral and anti-cancer drugs) </li></ul></ul><ul><ul><li>Some are edible delicacie s (ex. sea urchin eggs and sea cucumbers) </li></ul></ul>Ecology of Echinoderms
  14. 14. Demo – Sea Star Dissection
  15. 18. Homework for next class: <ul><li>Complete Echinoderms and Chordates Worksheet – </li></ul><ul><li>1 st side only (Section 29-1) </li></ul><ul><li>Complete sea star colouring diagram (include a key) </li></ul><ul><li>Work on 15 Ch. 29 Echinodermata cue cards </li></ul><ul><ul><li>Due Thursday, April 21 (Ch. 26-29 Invertebrate Test day) </li></ul></ul>Have a great weekend!
  16. 19. Works Cited <ul><li>Images taken from the following sources: </li></ul><ul><li>http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio%20102/bio%20102%20lectures/animal%20diversity/protostomes/lophotrochozoans/lophotrochozoans.htm </li></ul><ul><li>http://myfishtanks.info/fish-profile/saltwater-invertebrate-profiles/brittle-star-tiger-striped-serpent-seastar/ </li></ul><ul><li>http://www.iloverubberstamps.com/catalogpage2.html </li></ul><ul><li>http://clipart.usscouts.org/library/us_fish_and_wildlife_service/fish/ </li></ul><ul><li>http://jklsciencelab.weebly.com/starfish-dissection.html </li></ul><ul><li>http://www.topnews.in/law/general/featured?page=5816&destination=taxonomy </li></ul><ul><li>http://www.easyvectors.com/browse/other/sea-cucumber-clip-art </li></ul><ul><li>http://etc.usf.edu/clipart/49800/49826/49826_sea_lily.htm </li></ul><ul><li>http://www.australiascoralcoast.com/en/Things_to_see_and_do/Nature_and_wildlife/Pages/Nature_and_wildlife.aspx </li></ul><ul><li>http://www.picassomio.es/crown-of-thorns-starfish-poster-2386298.html </li></ul><ul><li>http://en.wikipedia.org/wiki/File:Sea_urchin_tests.jpg </li></ul>
  17. 20. Works Cited <ul><li>Images taken from the following sources: </li></ul><ul><li>http://www.kadamsphoto.com/nature_recreation/seashells_mollusks.htm </li></ul><ul><li>http://www.interesting-facts.biz/category/marine-animals-facts/page/3 </li></ul><ul><li>http://megashare.info/watch-the-office-season-7-episode-14-online-TWpVM01nPT0 </li></ul><ul><li>http://aspire.mlml.calstate.edu/aspire04/updates/nov/25nov/nov25.htm </li></ul><ul><li>http://siera104.com/bio/echin.html </li></ul><ul><li>http://www.naturebridge.org/headlands/blog/rachel-loud/creature-month-sea-stars </li></ul><ul><li>http://bonneeats.com/?p=270 </li></ul><ul><li>http://www.mahingakai.org.nz/mahinga-kai-species/kina </li></ul>

×