Mollusca dunia hewan
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Transcript of Mollusca dunia hewan
1
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.
Phylum MOLLUSCA Class Polyplacophora - Chiton
Phylum Mollusca
Class Scaphopoda – Tusk Shells
Phylum Mollusca Class - Gastropoda
Phylum Mollusca Class Gastropoda - Nudibranch
Phylum Mollusca Class – Gastropoda - Nudibranchs
Phylum Mollusca Class – Sea Hare
Class Gastropoda
whelks
Class - Gastropoda ConchConch
Class GastropodaClass Gastropoda Limpets and Periwinkles
Class - Gastropoda Abalone
Class - Gastropoda Land Snail
Class Bivalvia Clams, Mussels,Scallops
Class - Cephalopoda
Octopus
Squid
Class Cephalopoda
Octopus
Class Cephalopoda
Nautilus
Characteristics of Molluscans Size – Millimeter to 60 Feet (18M)
Major Food source
Lifestyle
Simple - Limpets
Complex – Squid and Octopi
Molluscan Body Plan
Visceral Mass
Foot
Adductor Muscles
Siphons
Gills
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
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.
Comparison of Body Plans
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
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
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
Hectocotylus
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
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