NCI 2024
    Groups
    Mammals Birds Amphibians Reptiles Myxini – Hagfishes Petromyz' – Lampreys Sharks & rays Animals Holocep' – Chimaeras Ray-finned fishes Dipneusti – Lungfish Gastropoda – Snails & slugs Coelac' – Coelacanths Insecta – Insects / bugs Arachnida – Spiders & scorpions Malacostraca – Malacostracans Diplopoda – Millipedes Bivalvia – Marine molluscs Cephalopoda – Squids & octopuses Chilopoda – Centipedes Pycnogonida – Sea spiders Merostomata – Horseshoe crabs More Classes
    Filters

    Regions

    See AllSelect

    Habitat

    See AllSelect

    Bivalvia – Marine molluscs

    Widely distributed class of invertebrates found in aquatic habitats throughout the world

    Bivalves, a remarkable group of aquatic creatures, are distinguished by their distinctive hinged, two-part shells. These shells provide protection and serve as an ingenious defense mechanism against potential predators. The varied shapes, sizes, and ornamentation of their shells reflect the diverse adaptations that different species have evolved over time.

    Beyond their protective shells, bivalves possess another extraordinary talent – they are highly efficient filter feeders. These remarkable creatures employ specialized structures known as gills to filter microscopic algae and particles from the surrounding water. This process not only sustains their nutrition but also plays a vital role in maintaining the quality of water and nutrient cycling in aquatic ecosystems. They are, in essence, the unsung heroes of water purification in the natural world.

    Moreover, some bivalves, like oysters, are renowned for their ability to produce exquisite pearls. When an irritant infiltrates the soft mantle of a bivalve, it triggers a remarkable response. Layers of nacre, commonly known as mother-of-pearl, are secreted to encase the irritant over time, forming a precious pearl admired for its iridescent beauty.

    Bivalves are incredibly adaptable, thriving in many habitats that span from shallow coastal areas to the depths of ocean floors and even within brackish estuaries. This adaptability, combined with their unique characteristics and valuable roles in maintaining aquatic ecosystems, has contributed to their global distribution and continued success in the natural world.

    Did you know?

    • They use siphoning to filter particles from water and obtain nutrients and oxygen.
    • Many bivalves are prized in the culinary world. Oysters, mussels, clams, and scallops are enjoyed as delicious seafood in various cuisines globally.
    • They serve as key indicators of environmental health, reflecting changes in water quality and pollution levels through their population and shell growth patterns.
    • Freshwater pearls produced by bivalves, such as mussels, have been used in jewelry for centuries. They have cultural and historical significance worldwide.
    • Some bivalves, like the ocean quahog (Arctica islandica), can have incredibly long lifespans. These clams have been known to live for over 500 years, making them among the longest-lived animals on Earth.