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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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Kingdom: Animalia

    • G. Phyla: Molusca
      • i.)Sub-phyla: Gastropods/Bivalves
gastropoda

FromancientGreek

Prefixγαστήρ gastr-stomach

Sufixπούς pod-foot

325,000 speciescurrentlyexisting

-only 85 thousandhaveacceptednames

Gastropoda
gastropod characteristics

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
bivalvia

Name describes theshape of theshell.

  • Alsoknown as:
    • Pelecypoda (axefoot)
    • Acephala (no head)
    • Lamellibranchia (plate-like gill elements)

aprox.  9,200 species

Bivalvia
characteristics

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
gastropod fossil record

Most are fossils of theshell

    • Fewslugfossils
  • Earliests-exclusively marine (end of Cambrian)
GastropodFossil Record
bivalve fossil record

1st fromtheCambrianperiod

    • 510 millionyearsago
  • MostabundantduringtheDevonianperiod
    • 400 millionyearsago
  • DuringPaleozoicperiod- near shore enviroments.
BivalveFossil record
digestive system

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
respiratory system

Lungsorgills

    • Dependingonthehabitat
  • Respiratoryprotein: Hemocyanin
  • Bivalves
    • Watercurrentsenabletheorganismtogetfreshoxygen.
RespiratorySystem
circulatory system

Open circulatorysystem

  • Gastropods:
    • 2 chamberheart
      • Auricle (recievesthehaemolymph)
      • Ventricle (pumpshaemolymphintothe aorta)
    • Haemolymph
      • Circulatoryfluid
    • Short aorta
      • Divided in 2 mainvessels
  • Bivalves:
    • 3 chamberheart
Circulatorysystem
sensory system

Gastropods

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

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