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Bivalves and Gastropods

Mae Gallego 9A. Bivalves and Gastropods. Kingdom : Animalia G . Phyla : Molusca i .)Sub- phyla : Gastropods / Bivalves. From ancient Greek Prefix γαστήρ gastr - stomach Sufix πούς pod- foot 325,000 species currently existing - only 85 thousand have accepted names. Gastropoda.

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Bivalves and Gastropods

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  1. Mae Gallego 9A Bivalves and Gastropods

  2. Kingdom: Animalia • G. Phyla: Molusca • i.)Sub-phyla: Gastropods/Bivalves

  3. FromancientGreek Prefixγαστήρ gastr-stomach Sufixπούς pod-foot 325,000 speciescurrentlyexisting -only 85 thousandhaveacceptednames Gastropoda

  4. Haveshell Univalves Tortedbody Anus and head are together Welldefined head 2-4 sensorytentacleswitheyes Moves gliding along a surface Leaves mucus or slime produced by glands on the foot. Invertabrate Gastropodcharacteristics

  5. Name describes theshape of theshell. • Alsoknown as: • Pelecypoda (axefoot) • Acephala (no head) • Lamellibranchia (plate-like gill elements) aprox.  9,200 species Bivalvia

  6. Shell (2 asymmetrically rounded halves) • Made of calcium carbonate • Hinge (flexible ligament that joins the valves) • Most live in water • No defined head • Breathe-only one/two pairs of gills • Have no brain • Can live in water with a pH greater than 5 • Mostly sedentary Characteristics

  7. Most are fossils of theshell • Fewslugfossils • Earliests-exclusively marine (end of Cambrian) GastropodFossil Record

  8. 1st fromtheCambrianperiod • 510 millionyearsago • MostabundantduringtheDevonianperiod • 400 millionyearsago • DuringPaleozoicperiod- near shore enviroments. BivalveFossil record

  9. GastropodLife cicle

  10. bivalveLifecycle

  11. Gastropods: • Mostly hervibores or scavangers • Use radula to eat • tongue-like structure-rows of rasping teeth. • Adapts to the food it eats • Stomach is above foot • Vivalves: • Filter feeding (gills) • Scraping detritus from bottom (most primitive) • Intercellulardigestion Digestivesystem

  12. Lungsorgills • Dependingonthehabitat • Respiratoryprotein: Hemocyanin • Bivalves • Watercurrentsenabletheorganismtogetfreshoxygen. RespiratorySystem

  13. Open circulatorysystem • Gastropods: • 2 chamberheart • Auricle (recievesthehaemolymph) • Ventricle (pumpshaemolymphintothe aorta) • Haemolymph • Circulatoryfluid • Short aorta • Divided in 2 mainvessels • Bivalves: • 3 chamberheart Circulatorysystem

  14. Gastropods • Olfactory • Mechanorceptor • Statocyst • Eyes or visual organ • Central nervous system • Bivalves • Poor nervous system and sensory organs • Chemosensorycells at edge of mantle Sensorysystem

  15. Anyquestions, comentsetc?

  16. http://www.google.es/imgres?q=snail+circulatory+system&um=1&hl=es&biw=1360&bih=634&tbm=isch&tbnid=F36RH2-OyisixM:&imgrefurl=http://myclasses.naperville203.org/staff/NNHSBiology/KraftsonEco/Animal%2520Kingdom%2520%2520Period%25202/Mollusca.aspx&docid=WyxdXLXKu-cJXM&imgurl=http://www.biologie.uni-hamburg.de/b-online/library/onlinebio/circsys_2.gif&w=502&h=314&ei=Yh5BT6eZBcTE0QX6sJ2PDw&zoom=1&iact=hc&vpx=348&vpy=308&dur=5644&hovh=177&hovw=284&tx=60&ty=71&sig=101967442354638864406&page=1&tbnh=110&tbnw=176&start=0&ndsp=18&ved=0CF0QrQMwBwhttp://www.google.es/imgres?q=snail+circulatory+system&um=1&hl=es&biw=1360&bih=634&tbm=isch&tbnid=F36RH2-OyisixM:&imgrefurl=http://myclasses.naperville203.org/staff/NNHSBiology/KraftsonEco/Animal%2520Kingdom%2520%2520Period%25202/Mollusca.aspx&docid=WyxdXLXKu-cJXM&imgurl=http://www.biologie.uni-hamburg.de/b-online/library/onlinebio/circsys_2.gif&w=502&h=314&ei=Yh5BT6eZBcTE0QX6sJ2PDw&zoom=1&iact=hc&vpx=348&vpy=308&dur=5644&hovh=177&hovw=284&tx=60&ty=71&sig=101967442354638864406&page=1&tbnh=110&tbnw=176&start=0&ndsp=18&ved=0CF0QrQMwBw http://en.wikipedia.org/wiki/File:CyprusPlioceneGastropod.JPG http://en.wikipedia.org/wiki/Fossil_record http://en.wikipedia.org/wiki/Gastropoda http://www.natureduca.com/zoo_inverteb_moluscos3.php http://encina.pntic.mec.es/nmeb0000/invertebrados/moluscos/gruposmoluscos/gasteropodos.html http://www.scholarpedia.org/article/Gastropod_reproductive_behavior http://en.wikipedia.org/wiki/Gastropoda http://www.manandmollusc.net/advanced_introduction/moll101gastropoda.html http://micropig.tumblr.com/post/807759651/dragon-slug-how-do-you-exist http://www.google.es/search?q=slug&um=1&ie=UTF-8&hl=es&tbm=isch&source=og&sa=N&tab=wi&ei=5kBBT4LwGIHChAepwZ3OBQ&biw=1360&bih=634&sei=n0FBT4mNOMaEhQfuw7XEBQ http://www.manandmollusc.net/advanced_introduction/mollusca_101_intro.html http://www.kgs.ku.edu/Extension/fossils/bivalve.html http://infusion.allconet.org/webquest/PhylumMollusca.html http://www.waterencyclopedia.com/Bi-Ca/Bivalves.html#b bibliography

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