18.1 Introduction to the Gastropoda
18.1.1 Phylogeny and Classification
18.1.2 Morphology
18.1.2.1 Shell, Operculum and External Body
18.1.2.2 Shell Muscles
18.1.2.3 Operculum
18.1.2.4 Head-Foot
18.1.2.5 Mantle Cavity and Its Organs
18.1.2.6 Digestive System
18.1.2.7 Renopericardial System
18.1.2.8 Reproductive System
18.1.2.9 Nervous System and Sense Organs
18.1.3 Biology, Ecology, and Behaviour
18.1.3.1 Habits and Habitats
18.1.3.2 Locomotion and Behaviour
18.1.3.3 Life History
18.1.3.4 Feeding
18.1.3.5 Associations
18.1.4 Economic Values
18.1.5 Diversity and Fossil History
18.2 The Initial Radiation – Eogastropods and Orthogastropods
18.2.1 Hypothetical Reconstructions
18.2.1.1 A Hypothetical Ancestral Gastropod
18.2.1.2 Eogastropoda
18.2.1.3 Orthogastropoda
18.3 The Lower Groups of Gastropods
18.4 Patellogastropoda (= Docoglossa, Cyclobranchia, Eogastropoda in Part)
18.4.1 Introduction
18.4.2 Phylogeny and Classification
18.4.2.1 Sister Group Relationships
18.4.2.2 Outline of Classification
18.4.3 Morphology
18.4.3.1 Shell and Protoconch
18.4.3.2 Head-Foot, Mantle, and Operculum
18.4.3.3 Mantle Cavity
18.4.3.4 Digestive System
18.4.3.5 Reproductive System
18.4.3.6 Renopericardial System
18.4.3.7 Nervous System and Sense Organs
18.4.4 Biology, Ecology, and Behaviour
18.4.4.1 Habits and Habitats
18.4.4.2 Locomotion and Behaviour
18.4.4.3 Life History
18.4.4.4 Feeding and Diet
18.4.4.5 Associations
18.4.5 Diversity and Fossil History
18.5 Vetigastropoda
18.5.1 Introduction
18.5.2 Phylogeny and Classification
18.5.2.1 Outline of Classification
18.5.2.2 Deep-Sea Enigmas; The Neomphaloidean and Cocculinoidean Taxa
18.5.3 Morphology
18.5.3.1 Shell and Protoconch
18.5.3.2 Head-Foot, Mantle, Operculum, and Locomotion
18.5.3.3 Mantle Cavity
18.5.3.4 Digestive System
18.5.3.5 Reproductive System
18.5.3.6 Renopericardial System
18.5.3.7 Nervous System and Sense Organs
18.5.4 Biology, Ecology, and Behaviour
18.5.4.1 Habits and Habitats
18.5.4.2 Feeding and Diet
18.5.4.3 Life History
18.5.4.4 Associations
18.5.4.5 Behaviour
18.5.5 Diversity and Fossil History
18.6 Neritimorpha (= Neritopsina)
18.6.1 Introduction
18.6.2 Phylogeny and Classification
18.6.2.1 Sister Group Relationships
18.6.2.2 Outline of Classification
18.6.3 Morphology
18.6.3.1 Shell and Protoconch
18.6.3.2 Head-Foot, Mantle, Operculum, and Locomotion
18.6.3.3 Mantle Cavity
18.6.3.4 Digestive System
18.6.3.5 Renopericardial System
18.6.3.6 Reproductive System
18.6.3.7 Nervous System and Sense Organs
18.6.4 Biology and Ecology
18.6.4.1 Habits and Habitats
18.6.4.2 Feeding and Diet
18.6.4.3 Life History
18.6.4.4 Associations
18.6.4.5 Behaviour
18.6.5 Diversity and Fossil History