Lyonsiellidae | |
---|---|
Policordia pilula | |
Scientific classification | |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Bivalvia |
Subclass: | Heterodonta |
Order: | Anomalodesmata |
Superfamily: | Verticordioidea |
Family: | Lyonsiellidae Dall, 1895 |
Lyonsiellidae is a taxonomic family of marine bivalve molluscs in the superfamily Verticordioidea.
In biology, taxonomy is the science of naming, defining (circumscribing) and classifying groups of biological organisms on the basis of shared characteristics. Organisms are grouped together into taxa and these groups are given a taxonomic rank; groups of a given rank can be aggregated to form a super-group of higher rank, thus creating a taxonomic hierarchy. The principal ranks in modern use are domain, kingdom, phylum, class, order, family, genus, and species. The Swedish botanist Carl Linnaeus is regarded as the founder of the current system of taxonomy, as he developed a system known as Linnaean taxonomy for categorizing organisms and binomial nomenclature for naming organisms.
Family is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy; it is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as being the "walnut family".
Bivalvia, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. Bivalves as a group have no head and they lack some usual molluscan organs like the radula and the odontophore. They include the clams, oysters, cockles, mussels, scallops, and numerous other families that live in saltwater, as well as a number of families that live in freshwater. The majority are filter feeders. The gills have evolved into ctenidia, specialised organs for feeding and breathing. Most bivalves bury themselves in sediment where they are relatively safe from predation. Others lie on the sea floor or attach themselves to rocks or other hard surfaces. Some bivalves, such as the scallops and file shells, can swim. The shipworms bore into wood, clay, or stone and live inside these substances.
Genera within the family Lyonsiellidae include: [1]
Dall's porpoise is a species of porpoise found only in the North Pacific. It came to worldwide attention in the 1970s when it was disclosed for the first time to the public that salmon fishing trawls were killing thousands of Dall's porpoises and other cetaceans each year by accidentally capturing them in their nets. Dall's porpoise is the only member of the genus Phocoenoides. It was named after American naturalist W. H. Dall.
The Arcida is an extant order of bivalve molluscs. This order dates back to the lower Ordovician period. They are distinguished from related groups, such as the mussels, by having a straight hinge to the shells, and the adductor muscles being of equal size. The duplivincular ligament, taxodont dentition, and a shell microstructure consisting of the outer crossed lamellar and inner complex crossed lamellar layers are defining characters of this order.
The Terebridae, commonly referred to as auger shells or auger snails, is a group or family of small to large predatory marine gastropods.
Heterodonta is a taxonomic subclass of saltwater clams, marine bivalve molluscs. This subclass includes the edible clams, the cockles and the Venus clams.
Anomalodesmata is an order of saltwater clams, marine bivalve molluscs. This grouping was formerly recognised as a taxonomic subclass. It is called a superorder in the current World Register of Marine Species, despite having no orders, to parallel it with sister taxon Imparidentia, which does have orders.
The Columbellidae, the dove snails or dove shells, are a family of minute to small sea snails, marine gastropod mollusks in the order Neogastropoda.
Homalopoma, common name the dwarf turbans, is a genus of mostly very small sea snails with a calcareous operculum, marine gastropoda molluscs in the family Colloniidae.
Solariellidae is a family of small sea snails, marine gastropod mollusks in the superfamily Trochoidea.
Pseudomelatomidae is a family of predatory sea snails, marine gastropods included in the superfamily Conoidea and part of the Neogastropoda.
Clathrodrillia is a genus of sea snails, marine gastropod mollusks in the family Drilliidae.
Compsodrillia is a genus of sea snails, marine gastropod mollusks in the family Pseudomelatomidae, the turrids and allies.
Pleurotomella is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae.
Hindsiclava is a genus of sea snails, marine gastropod mollusks in the family Pseudomelatomidae,
Aforia is a genus of sea snails, marine gastropod mollusks in the family Cochlespiridae.
Gymnobela is a genus of sea snails, marine gastropod mollusks in the family Raphitomidae.
Astyris is a genus of sea snails, marine gastropod mollusks in the family Columbellidae, the dove snails.
Margarites is a genus of sea snails, marine gastropod mollusks in the family Margaritidae.
Boreotrophon is a genus of sea snails, marine gastropod mollusks in the family Muricidae, the murex snails or rock snails.
Ergalataxinae is a taxonomic subfamily of small to medium-sized predatory sea snails, marine gastropod mollusks within the family Muricidae, the rock snails. In this subfamily, the aragonitic shell has 0–2 varices.
Euheterodonta is an infraclass of Mollusca in the class Bivalvia.
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