The taxonomic term Bivalvia was first used by Linnaeus in the 10th edition of his Systema Naturae in 1758 to refer to animals having shells composed of two valves. [3] More recently, the class was known as Pelecypoda, meaning "axe-foot" (based on the shape of the foot of the animal when extended).The name "bivalve" is derived from the Latin bis, meaning 'two', and valvae, meaning 'leaves of a ...

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 left and right valves. The valves are connected to one another at a hinge. Primitive bivalves ingest sediment; however, in most species the respiratory gills have become modified into organs of ...

May 31, 2024 · Evolution. Bivalves evolved during the Cambrian Explosion (540 to 520 million years ago) as the first creatures with mineralized skeletons, along with brachiopods.Around this time, early bivalve genera, like Pojetaia, Fordilla, Tuarangia, Camya, and Arhouriella, came into existence.; In the Early Ordovician Period (around 485 million years ago), the bivalves diversified and developed the ...

Aug 26, 2020 · Image Credits:- Cover image Joanbanjo, Pina rudis by Diego Delso, Mytilus galloprovincialis by Diego Delso – License CC BY-SA 4.0, Giant Clam by – Nick Hobgood, Blue Max Clam by RevolverOcelot, Mussel byssus by Brocken Inaglory, license CC BY-SA 3.0 Pearl Oyster by Keith Pomakis, Oyster Cultivation by Peter Gugerell – license CC BY-SA 2.5, Clam Dinner by Leon Brocard – license CC BY 2.0

Jun 16, 2024 · Like fish, bivalve mollusks breathe through their gills. As filter feeders, bivalves gather food through their gills. Some bivalves have a pointed, retractable "foot" that protrudes from the shell and digs into the surrounding sediment, effectively enabling the …

Bivalvia has an extensive fossil record, tracing to the Cambrian.Bivalves appeared late in the Cambrian explosion.By the middle Ordovician (about 460 mya), recognizable members of all modern subclasses had appeared (Grzimek et al. 2004).. While Brachiopoda was a dominant group in the Paleozoic, the bivalves came to dominate them during this era, and by the end-Permian extinction, bivalves were ...

Bivalve - Mollusks, Shells, Filter Feeders: Paleontologists interpret bivalves based on shell and ligament structure, hinge teeth arrangement, and body form. Class Bivalvia has about 8,000 extant species divided into six subclasses: Palaeotaxodonta (Protobranchia), Cryptodonta, Pteriomorphia, Palaeoheterodonta, Heterodonta, and Anomalodesmata.

bivalve, Any member of the mollusk class Bivalvia, or Pelecypoda, characterized by having a two-halved (valved) shell. Clams, cockles, mussels, oysters, scallops, and shipworms are bivalves.Most are completely enclosed by the shell, the two valves of which are joined by an elastic ligament, and by two sheets of tissue called the mantle.

1 Introduction. Considered the second most diverse class of the Mollusca, it is currently estimated that there are between 8000 and 20,000 species of Bivalvia Linnaeus, 1758 contained in 106 families (Bieler et al., 2013: table 1).The classification of the Bivalvia has been the subject of a variety of reviews (and opinions), for example, Newell (1969a), Moore (1969), Vokes (1980), Boss …

Chapter contents: Class Bivalvia: Introduction and Morphology – 1. Bivalve Phylogeny and Classification ← – 2. Bivalve Ecology and Paleoecology – 3. Evolutionary History of Bivalves – 4. References and Further ReadingOverview Efforts at bivalve classification and phylogenetic analysis have traditionally been based on prominent morphological features such as …