phylum molluscaphylum molluscaagr.asu.edu.eg/uploads/agr/lec4_201511252274.pdf · phylum mollusca...
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Phylum MolluscaPhylum Mollusca
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Phylum Mollusca (mollis, soft)
Body usually an anterior head, ventral foot and a dorsal visceral massdorsal visceral mass.Covered by a fleshy outgrowth of the body wall called a mantlecalled a mantle. Shell if present is secreted by the mantle
Radula- a tongue-like structure bearing transversRadula- a tongue-like structure bearing transvers rows of minute chitinous teeth.Good phylum for demonstrating AdaptativeGood phylum for demonstrating Adaptative Radiation.With the exception of Monoplacophora theWith the exception of Monoplacophora, the phylum is unsegmented.
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SSystems:
SkeletalSkeletal- Mantle may secretes a shell. Use hydrostatic pressure for ventral muscular foothydrostatic pressure for ventral muscular foot.MusclesMuscles -Ventral muscular foot and other muscles presentmuscles present.DigestiveDigestive- complete complex with salivary glands, digestive gland and Rasping tongue (Radula)digestive gland and Rasping tongue (Radula).CirculatoryCirculatory - Open except for Cephalopoda. Dorsal heart usually in a pericardial cavityDorsal heart, usually in a pericardial cavity.RespiratoryRespiratory - Ctenidia (gills) in mantle cavity, respiratory pigment is copperrespiratory pigment is copper.
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Systems:
ExcretoryExcretory- by nephridia usually connecting to the pericardial cavity,pericardial cavity, the coelom is usually reduced to the cavities of the nephridia,
gonads and pericardium.NN N i ith i i f li tNervousNervous - Nerve ring with various pairs of ganglia—two pairs of nerve cords, one innervating the foot, the other the visceral mass (modified ventral ladder-like system)( y )IntegumentaryIntegumentary - MantleEndocrineEndocrine - nervous systems produces hormones.ReproductiveReproductive - varied- monoecious, protandric, or dioecious. Larva in marine = trochophore and veliger, in freshwater clam is glochidiumfreshwater clam is glochidium.
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Taxonomy
Classes:Mono placophora (no specimens)Poly placophoray p pScaphopodaGastropodaGastropodaBivalviaCephalopoda
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(1) Class Polyplacophora(Chitons)
Elliptical body with dorsal surface bearing eight overlapping limybearing eight overlapping limy plates (valves)Chitons are marineChitons are marine. They live mostly in shallow water. All are similar in morphology and All are similar in morphology and
ecology. They are slow moving microphagousy g p g
feeders, scraping algae and other small invertebrates from substrate with their radula (Acanthochiton)radula. (Acanthochiton)
Chiton
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Katherina
Katherina dorsal surface
Katherina ventral surface
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(2) Cl G t d(2) Class: GastropodaUnivalves, Shell usually spiral,distinct head scraping raduladistinct head, scraping radula.visceral mass is coiled in shell.RepresentativesGarden snail (Helix), Whelks ( ),
(Busycon), Conch, Cowries,, Sea hare, Nudibranchs, Slugs, and abalone.
Slugs: without shell
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Helix (garden snail)
Helix, dorsal view
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Other Gastropods
Busycon (shell removed)
Busycon shells
Busycon eggs
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Examples of gastropodp g p
Abalone shells
C hConch
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Sea Hair (ventral view) Sea Hair side view
SlugSlug
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(3) Class Bivalvia(3) Class BivalviaShell of two lateral valves, with dorsal hingehinge.Mantle of flattened right and left lobes.
i i l f iPosterior margin commonly forming siphonsLabial palps beside mouthNo headNo headNo radula
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Representatives of Bivalvia
Anodonta (Freshwater clam)Teredo (Shipworm)Rock boring clamRock boring clamOstrea (Oyster)Pecten (Scallop)
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A dAnodonta
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External Shell
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Internal parts of the Shell
Pallial linePallial line
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Visceral Mass
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(4) Cl C h l d(4) Class CephalopodaLarge head with conspicuous eyesVentral foot modified into tentacles(are arms)Ventral foot modified into tentacles(are arms) with suckers.Representative CephalopodsRepresentative CephalopodsNautilus(Chambered Nautilus)
Octopus (Octopus)Loligo (Squid)Loligo (Squid)
Sepia (Cuttle fish)
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O t 8Octopus 8 arms
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Sepia 10Sepia 10 arms
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الجلد شوكيات شعبة : شعبة شوكيات الجلد ثامنا : ثامناPhylum: EchinodermataPhylum: Echinodermata
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• الطبقات وأجھزة:ثالثية وأعضاء أنسجة لديھا .بالتالي ب جھز:ي ج و و يھ ي . ب• ً الطور البالغ متناظر (متناظرة جانبياً لكنه يتطور من يرقات جانبية شعاعيا
). التناظرات ةل ق •ق . حقيقيةسيلوميات
• مقسمة حلقات غير • بدائ العصب عصبية(جھازھا شبكة من •)يتكون ). يتكون من شبكة عصبية(جھازھا العصبي بدائي• لھا أذرع أو أقدام أنبوبية ترتكز إلي قرص مركزي ويبلغ عدد األذرع خمسة
. أو مضاعفاتھا• . في التنفس الخياشيمتستخدم • سميك تحته ھيكل من الصفائح واألشواك ولذا سميت جلد شوكي لھا
. الشوكجلدياتالشوكجلديات• الصفة الفريدة والممّيزة للشوكجلديات وجود جھاز وعائي مائي يساعد في
س. الحركة والتھام الغذاء والتنفس و م ھ و ر• ). ذو فتحتين(جھاز ھضمي كامل لديھا • . ليس لديھا جھاز دوري أو جھاز إخراجي
•ث .منفصالن والجنسانالتكاثر جنسي
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الخيارياتHolo thur oidea
بالصخور أو داخل حفر ملتصقةتوجد في قاع البحر اك أش ال أذ تلك .التمتلك أذرع وال أشواكوالت
يتراوح عددھالھا لوامس حول الفمتحتوي على صفائح ح ى موي ول س و وحھ ر ي٣٠-١٠من . المسا
ال ا خ ا ثلت أ .من أمثلتھا خيار البحرن
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اتيالقنفدطائفة Echin oidea
ا ا :خصائصھاخفي-١ البحرية الشواطئ علي يتعيش ري ب ئ و ي يش
الناطق الصخرية و الطينية كة٢ ت متحركة-٢
كروي أو قرصالجسم مستدير-٣ يمال يوجد لھا أذرع -٤
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الزنبقياتطائفة Crin oidea
-:خصائصھا -:خصائصھاأفرادھا تشبه النباتات العادية في -١
شكلھاشكلھاتتركب من صفائح لھا ساق -٢
لإللتصاقو زوائدجيريةةالساق-٣ من أذرعيتفرع خمسة ق ن رع رعي
مرنة تحيط بالفم البحر:مثال البحرزنابق ريش ريش البحر–زنابق البحر:مثال
النجمي
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النجمياتطائفة Asteroidea
-:خصائصھا :ھ نجمية الشكلجميع أفرادھا -١
ملتصقة البحار ف تعيش في البحار ملتصقةتعيشبالصخور
ل٢ تت أذ ا القل بالقرصلھا أذرع تتصل-٢المركزي
ذات ممصات أقدام أنبوبيةتمتلك -٣يعلي السطح السفلي ح ي
نجم البحر الھش–نجم البحر : مثل
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Asteropectin
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االرجل مخلبيات شعبة مخلبيات االرجل شعبةphtlum: Onychophorap y p