Veliger
The veliger is a larval stage in the development of certain mollusks, particularly within the classes Gastropoda and Bivalvia. This stage follows the trochophore larva and is characterized by the development of a ciliated structure known as the velum, which is used for swimming and feeding.
Development[edit]
The veliger stage is a critical phase in the life cycle of many mollusks. During this stage, the larva undergoes significant morphological changes that prepare it for its transition to a juvenile and eventually an adult form. The velum, a distinctive feature of the veliger, is a lobed, ciliated structure that facilitates locomotion and feeding in the planktonic environment.
Morphology[edit]
The veliger larva possesses a shell, which is often coiled in gastropods and bivalves. The shell provides protection and is an important feature that distinguishes the veliger from earlier larval stages. The velum is used to capture food particles from the water, and its cilia beat in a coordinated fashion to create water currents that bring food to the larva.
Metamorphosis[edit]
As the veliger matures, it undergoes metamorphosis, a process that involves the reorganization of its body structure to form the adult morphology. This includes the development of the foot, the reduction or loss of the velum, and the further development of the shell and other adult structures.
Ecological Role[edit]
Veligers play a crucial role in the dispersal of mollusk species. As planktonic larvae, they can be carried by ocean currents over long distances, allowing for the colonization of new habitats. This dispersal capability is essential for the survival and genetic diversity of mollusk populations.
Examples of Veligers[edit]
Nudibranchs[edit]
Nudibranchs, a group of soft-bodied, marine gastropod mollusks, often have a veliger stage in their development. The veliger of the nudibranch Tritonia diomedea is an example of this larval form.
Bivalves[edit]
Many bivalves, such as clams and oysters, also have a veliger stage. This stage is crucial for their life cycle, as it allows for the wide dispersal of the species in marine environments.
Related Pages[edit]
Gallery[edit]
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Fiona pinnata veliger
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Fiona pinnata veliger
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Fiona pinnata veliger
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Fiona pinnata veliger
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Fiona pinnata veliger
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