mollusca dunia hewan
DESCRIPTION
Everything about AnimaliaTRANSCRIPT
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ANIMALIAStandar KompetensiSiswa mampu memahami prinsip-prinsip pengelompokkan makhluk hidup.
Kompetensi Dasar2.6 Mendeskripsikan ciri-ciri filum dalam dunia Hewan dan peranannya bagi kehidupan
Indikator Mengenal ciri-ciri umum animalia. Mengidentifikasi karakteristik berbagai filum anggota kingdom
animalia. Menyajikan data (gambar, foto, deskripsi) berbagai ivertebrata
yang hidup di lingkungan sekitarnya berdasarkan pengamatan.
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Phylum MOLLUSCA Class Polyplacophora - Chiton
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Phylum Mollusca
Class Scaphopoda – Tusk Shells
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Phylum Mollusca Class - Gastropoda
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Phylum Mollusca Class Gastropoda - Nudibranch
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Phylum Mollusca Class – Gastropoda - Nudibranchs
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Phylum Mollusca Class – Sea Hare
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Class Gastropoda
whelks
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Class - Gastropoda ConchConch
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Class GastropodaClass Gastropoda Limpets and Periwinkles
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Class - Gastropoda Abalone
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Class - Gastropoda Land Snail
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Class Bivalvia Clams, Mussels,Scallops
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Class - Cephalopoda
Octopus
Squid
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Class Cephalopoda
Octopus
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Class Cephalopoda
Nautilus
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Characteristics of Molluscans Size – Millimeter to 60 Feet (18M)
Major Food source
Lifestyle
Simple - Limpets
Complex – Squid and Octopi
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Molluscan Body Plan
Visceral Mass
Foot
Adductor Muscles
Siphons
Gills
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Circulatory System
Open Circulatory System
Means that not all the blood is contained in vessels but rather vessels AND open chambers called sinuses
Sinuses take place of the Capillaries
3 chambered heart
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Body Systems
RespirationRespiration – this is accomplished thru the circulation of oxygen-rich water by the MANTLE
ExcretionExcretion – this is accomplished by Kidneys that double as a passageway for eggs or sperm
Nervous SystemNervous System – varies with species. Limpets and Bivalves are simple, Cephalopods are well developed.
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Comparison of Body Plans
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Specialized Structures
RadulaRadula – Horny-toothed structure found within the pharynx
Used for “Rasping” or “Scraping” plant or animal tissue
Bivalves are filter feeders and have lost this structure
Cephalopods, in addition, have a “Beak” which work together to kill prey
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Specialized Structures
OperculumOperculum – A protective plate that covered the opening to the shell of some gastropods
SiphonSiphon – A tube that allows for water to enter/leave the body of a Mollusc. Bivalves and Cephalopods
Siphuncle – Siphuncle – a cord of tissue that connects all the chambers of the Nautilus and used for boyancy
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Specialized Sturctures NacreNacre – secretion around sand particles
by oysters resulting in a pearl.
HectocotylusHectocotylus – a special structure on one of the arms of an Octopus (male) that allows it to deposit sperm packets into the females mantle cavity
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Hectocotylus
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Specialized Structures
Shells – Not all mollusc’s produce them
Make of calcium carbonate which is obtained from water or soil.
They can grow through the lifetime of the animal
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Reproduction
Varies tremendously from external fertilization to internal, dioecious and hermaphrodidic
Changing Sex – some such as oysters change back and forth from male to female releasing sperm and eggs accordingly.
Spermatophores – packets of sperm