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Phylum Mollusca. - From mollus meaning “ soft ”. Characteristics. Eucoelomate - True body cavity Hollow body cavity, Lined with peritonium (endodermis) Bilateral symmetry Most have Mantle Secretes shell - grows with organism Site of Respiration in terrestrial mollusks - PowerPoint PPT Presentation
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Phylum MolluscaPhylum Mollusca
- From mollus meaning “soft”- From mollus meaning “soft”
CharacteristicsCharacteristics Eucoelomate - True body cavity
Hollow body cavity, Lined with peritonium (endodermis)
Bilateral symmetry Most have Mantle
Secretes shell - grows with organism Site of Respiration in terrestrial mollusks
Tripoblastic - 3 tissue layers Many Organ systems - well-defined
circulatory, respiratory, excretory, and digestive systems
Eucoelomate - True body cavity Hollow body cavity, Lined with peritonium
(endodermis) Bilateral symmetry Most have Mantle
Secretes shell - grows with organism Site of Respiration in terrestrial mollusks
Tripoblastic - 3 tissue layers Many Organ systems - well-defined
circulatory, respiratory, excretory, and digestive systems
Characteristics (Contd’)Digestion
Characteristics (Contd’)Digestion
Complete digestive tract Separate mouth and anus Radula
Rasping “file” with hundreds of tooth like structures
Feeding Patterns - filter feeders, herbivores, carnivores
Complete digestive tract Separate mouth and anus Radula
Rasping “file” with hundreds of tooth like structures
Feeding Patterns - filter feeders, herbivores, carnivores
Characteristics (Contd’)Circulation
Characteristics (Contd’)Circulation
Some - Open Circulatory System Ex. Gastropoda and bivalvia
Some - Closed circulatory system Ex. Cephalopoda
All have hearts
Some - Open Circulatory System Ex. Gastropoda and bivalvia
Some - Closed circulatory system Ex. Cephalopoda
All have hearts
Characteristics (Contd’) Cephalization
Characteristics (Contd’) Cephalization
Brain with nervous system Gastropoda and Cephalopoda Exception Bivalvia no head=no brain
Sensory cells All have - Touch, smell, taste, balance Some have - True eyes
Cephalopoda and some Gastropoda
Brain with nervous system Gastropoda and Cephalopoda Exception Bivalvia no head=no brain
Sensory cells All have - Touch, smell, taste, balance Some have - True eyes
Cephalopoda and some Gastropoda
ClassificationClassification
Phylum- Mollusca 5 classes:1.Gastropoda2.Bivalvia3.Cephalopoda4.Polyplacophora5.Scaphopoda
Phylum- Mollusca 5 classes:1.Gastropoda2.Bivalvia3.Cephalopoda4.Polyplacophora5.Scaphopoda
1. Class- Gastropoda -“stomach foot”
1. Class- Gastropoda -“stomach foot”
Has one shell or noneEx. Snails, slugs, sea slugs
Snail Conch
Slug Whelk Abalone
2. Class Bivalvia - “Two Shells”
2. Class Bivalvia - “Two Shells”
Ex. Clams, mussels, oysters, scallops
Ex. Clams, mussels, oysters, scallops
Clam Mussel
Scallop Oyster
3. Class Cephalapoda -“head foot”
3. Class Cephalapoda -“head foot”
No shell or one Ex. Squid, octopus, nautilus,
cuttlefish
No shell or one Ex. Squid, octopus, nautilus,
cuttlefish
OctopusSquid
Nautilus
4. Class Polyplacophora -“many plates”
4. Class Polyplacophora -“many plates”
Mantle made of 8 dorsal plates Ex. Chitons
Mantle made of 8 dorsal plates Ex. Chitons
5. Class Scaphopoda5. Class Scaphopoda
Ex. Tooth shell ( aka. Tusk shell) Ex. Tooth shell ( aka. Tusk shell)