As a group, bivalves have no head and lack some typical molluscan organs such as the radula and the odontophore. Their gills have evolved into ctenidia, specialised organs for feeding and breathing.

Bivalve, (class Bivalvia), any of more than 15,000 species of clams, oysters, mussels, scallops, and other members of the phylum Mollusca characterized by a shell that is divided from front to back into …

Dec 5, 2025 · Bivalves are a group of freshwater and marine mollusks with bilaterally symmetric and laterally compressed bodies encased in a characteristic two-part shell. They belong to the class …

Throughout history, bivalves have been one of the most important marine animals to humans. They have been used for food, jewelry, decoration, even money.

Jan 26, 2001 · Also known as pelecypods, the approximately 15,000 species of this taxon are found in marine and freshwater habitats throughout the world. A bivalve is characterized by possessing two …

Nov 24, 2025 · The class Bivalvia represents a diverse group of aquatic mollusks characterized by two hinged, usually symmetrical shells, or valves, that completely enclose the organism’s soft body.

Bivalves are aquatic mollusks belonging to the class Bivalvia (or Pelecypoda), a group that includes the familiar and economically important clams, oysters, scallops, and mussels.

Jul 31, 2025 · Bivalved animals represent a widespread and diverse group of aquatic invertebrates, belonging to the phylum Mollusca. They inhabit both marine and freshwater environments across the …

Bivalvia or bivalves, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of aquatic molluscs that have laterally compressed s...

Nov 3, 2025 · Class Bivalvia has about 8,000 extant species divided into six subclasses: Palaeotaxodonta (Protobranchia), Cryptodonta, Pteriomorphia, Palaeoheterodonta, Heterodonta, …