Mollusca 10-8 alex, pavel, stoyan

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Information about Mollusca 10-8 alex, pavel, stoyan

Published on April 15, 2010

Author: MrJewett

Source: slideshare.net

Mollusca Alexander Kanov Stoyan Kolev Pavel Vanev 10/8 http://news.nationalgeographic.com/news/2006/12/images/061222-giant-squid.jpg http://upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Tonicella-lineata.jpg/800px-Tonicella-lineata.jpg

Background & Characteristics Mollusks and Mollusca family - “soft” in Latin [1] Invertebrates [1] Bilateral symmetry [1] Outer shell & soft, fleshy body [4] Circulatory system is composed of a heart and blood vessels [4] Bring water in their body to obtain oxygen, emit carbon dioxide [4]

Mollusks and Mollusca family - “soft” in Latin [1]

Invertebrates [1]

Bilateral symmetry [1]

Outer shell & soft, fleshy body [4]

Circulatory system is composed of a heart and blood vessels [4]

Bring water in their body to obtain oxygen, emit carbon dioxide [4]

Evolution & Cladistics Last common ancestor with humans: Bilateria - Cambrian Period (~500 mil. yrs. ago) [1] [7] Closest phylums: Rotifera and Nematoda [1] Textbook

Last common ancestor with humans: Bilateria - Cambrian Period (~500 mil. yrs. ago) [1] [7]

Closest phylums: Rotifera and Nematoda [1]

Food & Digestion Food opening: mouths [1] Most mollusks contain a radula within the mouth - an organ that uses a scraping technique to move into the mouth [1] Mouth -> Stomach -> Digestive tract -> Anus [1] Only cephalopods are active predators [1] http://www.pirx.com/gallery/albums/mollusks/radula.jpg

Food opening: mouths [1]

Most mollusks contain a radula within the mouth - an organ that uses a scraping technique to move into the mouth [1]

Mouth -> Stomach ->

Digestive tract -> Anus [1]

Only cephalopods are

active predators [1]

Defensive Systems External shell - chitons, bivalves, gastropods (except slugs) [1] Jet stream - cephalopods: Water - squids Melanin ink - octopi [6] Octopi can camouflage themselves by producing color patters and complex skin textures [5] http://29.media.tumblr.com/tumblr_ky3o4iPyRx1qzde41o1_500.jpg

External shell - chitons, bivalves, gastropods (except slugs) [1]

Jet stream - cephalopods:

Water - squids

Melanin ink - octopi [6]

Octopi can camouflage

themselves by producing

color patters and complex

skin textures [5]

Movement Mollusks have a muscular foot with which they move [1] Gastropods and chitons move at a “snail’s pace” because of a small rippling motion of the foot [1] Cephalopods move with jet propulsion which draws water in the mantle cavity and exudes it from a siphon [1]

Mollusks have a muscular foot with which they move [1]

Gastropods and chitons move at a “snail’s pace” because of a small rippling motion of the foot [1]

Cephalopods move with jet propulsion which draws water in the mantle cavity and exudes it from a siphon [1]

Human Interaction Most of the mollusks serve as food for humans especially octopi, squids, clams and even snails [1] However, gastropods are also a pest to many plants [17] Pearls are extracted from clams [1] http://www.faqs.org/photo-dict/photofiles/list/4371/5816cooked_octopus.jpg

Most of the mollusks serve as food for humans especially octopi, squids, clams and even snails [1]

However, gastropods

are also a pest to many

plants [17]

Pearls are extracted

from clams [1]

Giant Clam ( Tridacna gigas) Height: 1.2m; weight: 200kg [2] Lifespan: 100 years [2] South Pacific and Indian Oceans [2] Symbioses with dinoflagellate algae [2] Egg -> larva -> clam [2] Moves only in larva stage [2] It’s useless [2] http://upload.wikimedia.org/wikipedia/commons/1/11/Giant_clam_or_Tridacna_gigas.jpg

Height: 1.2m; weight: 200kg

[2]

Lifespan: 100 years [2]

South Pacific

and Indian Oceans [2]

Symbioses with

dinoflagellate algae [2]

Egg -> larva -> clam [2]

Moves only in larva stage [2]

It’s useless [2]

South African Giant Slug ( Arion subfucsus ) http://www.youtube.com/watch?v=ZQYDkwGYqDk Widely found in South Africa, North America, New Zealand, and Australia [17] Reach to 20 - 30cm in size [17] They feed on plants, which is the main reason they are exterminated [17] Locomotion is accomplished by the rippling motion of the foot [17] They undergo a process called torsion [17] http://oregonstate.edu/dept/nurspest/Images/mollusks/slugs/Arufusprofilethumb.JPG

http://www.youtube.com/watch?v=ZQYDkwGYqDk

Widely found in South Africa, North America, New Zealand, and Australia [17]

Reach to 20 - 30cm in size [17]

They feed on plants, which is the

main reason they are exterminated

[17]

Locomotion is accomplished by the

rippling motion of the foot [17]

They undergo a process called torsion

[17]

Giant Squid ( Architeuthis dux ) Average 12-13m in length and 450kg in weight [3] North Atlantic, South Atlantic, North Pacific, Southwestern Pacific [3] Eat deep-sea fishes and other squid species; preyed on by some whales and sharks [3] Use tentacles to attack and immobilize its prey [3] http://www.chiba-muse.or.jp/NATURAL/exhibitions/special_ex/2006sinkaiten/image_exp_specimens/architeuthis_fig2.jpg

Average 12-13m in length

and 450kg in weight [3]

North Atlantic, South

Atlantic, North Pacific,

Southwestern Pacific [3]

Eat deep-sea fishes and other squid species; preyed on by some whales and sharks [3]

Use tentacles to attack and immobilize its prey [3]

Works Cited Campbell, Neil A., Jane B. Reece, Lisa Andrea. Urry, Michael L. Cain, Steven Alexander. Wasserman, Peter V. Minorsky, and Robert Bradley Jackson. Biology . San Francisco: Pearson, Benjamin Cummings, 2008. Print. &quot;Giant Clam.&quot; Wikipedia, the Free Encyclopedia. Web. 28 Mar. 2010. <http://en.wikipedia.org/wiki/Giant_clam>. &quot;Giant Squid, Architeuthis Dux at MarineBio.org.&quot; MarineBio.org - Marine Biology, Ocean Life Conservation, Sea Creatures, Biodiversity, Oceans Research... Web. 28 Mar. 2010. <http://marinebio.org/species.asp?id=156>. &quot;Mollusk.&quot; Monroe County Women's Disability Network . Web. 28 Mar. 2010. <http://www.mcwdn.org/Animals/Mollusks.html>. &quot;Octopus Defense - The Master of Camouflage.&quot; Cephalopod Information - Coral Sea Cephalopods - Nautilus, Octopus and Cuttlefish . Web. 28 Mar. 2010. <http://www.australiancephalopods.com/occy_defense.html>. &quot;The Odd, Odd Octopus.&quot; Your Daily Octopus . Web. 28 Mar. 2010. <http://fuckyeahoctopi.tumblr.com/post/413797291/the-odd-odd-octopus-mentalfloss-ink-in>. &quot;Origin of Bilateral-symmetrical Animals (Bilateria).&quot; National Center for Biotechnology Information . Web. 28 Mar. 2010. <http://www.ncbi.nlm.nih.gov/pubmed/15559569>. Photograph. Biology . San Francisco: Pearson, Benjamin Cummings, 2008. 662. Print. Photograph. Web. <http://29.media.tumblr.com/tumblr_ky3o4iPyRx1qzde41o1_500.jpg>. Photograph. Web. <http://news.nationalgeographic.com/news/2006/12/images/061222-giant-squid.jpg>. Photograph. Web. <http://oregonstate.edu/dept/nurspest/Images/mollusks/slugs/Arufusprofilethumb.JPG>. Photograph. Web. <http://upload.wikimedia.org/wikipedia/commons/1/11/Giant_clam_or_Tridacna_gigas.jpg>. Photograph. Web. <http://upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Tonicella-lineata.jpg/800px-Tonicella-lineata.jpg>. Photograph. Web. <http://www.chiba-muse.or.jp/NATURAL/exhibitions/special_ex/2006sinkaiten/image_exp_specimens/architeuthis_fig2.jpg>. Photograph. Web. <http://www.faqs.org/photo-dict/photofiles/list/4371/5816cooked_octopus.jpg>. Photograph. Web. <http://www.pirx.com/gallery/albums/mollusks/radula.jpg>. &quot;Slug Taxonomy.&quot; Home Page for Oregon State University . Web. 28 Mar. 2010. <http://oregonstate.edu/dept/nurspest/slug_taxonomy.htm>.

Campbell, Neil A., Jane B. Reece, Lisa Andrea. Urry, Michael L. Cain, Steven Alexander. Wasserman, Peter V. Minorsky, and Robert Bradley Jackson. Biology . San Francisco: Pearson, Benjamin Cummings, 2008. Print.

&quot;Giant Clam.&quot; Wikipedia, the Free Encyclopedia. Web. 28 Mar. 2010. <http://en.wikipedia.org/wiki/Giant_clam>.

&quot;Giant Squid, Architeuthis Dux at MarineBio.org.&quot; MarineBio.org - Marine Biology, Ocean Life Conservation, Sea Creatures, Biodiversity, Oceans Research... Web. 28 Mar. 2010. <http://marinebio.org/species.asp?id=156>.

&quot;Mollusk.&quot; Monroe County Women's Disability Network . Web. 28 Mar. 2010. <http://www.mcwdn.org/Animals/Mollusks.html>.

&quot;Octopus Defense - The Master of Camouflage.&quot; Cephalopod Information - Coral Sea Cephalopods - Nautilus, Octopus and Cuttlefish . Web. 28 Mar. 2010. <http://www.australiancephalopods.com/occy_defense.html>.

&quot;The Odd, Odd Octopus.&quot; Your Daily Octopus . Web. 28 Mar. 2010. <http://fuckyeahoctopi.tumblr.com/post/413797291/the-odd-odd-octopus-mentalfloss-ink-in>.

&quot;Origin of Bilateral-symmetrical Animals (Bilateria).&quot; National Center for Biotechnology Information . Web. 28 Mar. 2010. <http://www.ncbi.nlm.nih.gov/pubmed/15559569>.

Photograph. Biology . San Francisco: Pearson, Benjamin Cummings, 2008. 662. Print.

Photograph. Web. <http://29.media.tumblr.com/tumblr_ky3o4iPyRx1qzde41o1_500.jpg>.

Photograph. Web. <http://news.nationalgeographic.com/news/2006/12/images/061222-giant-squid.jpg>.

Photograph. Web. <http://oregonstate.edu/dept/nurspest/Images/mollusks/slugs/Arufusprofilethumb.JPG>.

Photograph. Web. <http://upload.wikimedia.org/wikipedia/commons/1/11/Giant_clam_or_Tridacna_gigas.jpg>.

Photograph. Web. <http://upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Tonicella-lineata.jpg/800px-Tonicella-lineata.jpg>.

Photograph. Web. <http://www.chiba-muse.or.jp/NATURAL/exhibitions/special_ex/2006sinkaiten/image_exp_specimens/architeuthis_fig2.jpg>.

Photograph. Web. <http://www.faqs.org/photo-dict/photofiles/list/4371/5816cooked_octopus.jpg>.

Photograph. Web. <http://www.pirx.com/gallery/albums/mollusks/radula.jpg>.

&quot;Slug Taxonomy.&quot; Home Page for Oregon State University . Web. 28 Mar. 2010. <http://oregonstate.edu/dept/nurspest/slug_taxonomy.htm>.

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