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Phaxas Tenellus
''Phaxas'' is a genus of small razor shells in the family Pharidae. Members of the genus have a pair of elongate valves and live in soft sediments on the sea bed. They have a muscular foot with which they can dig rapidly and a short siphon which they extend to the surface of the substrate. They are suspension feeders. Species The following species are recognised: * ''Phaxas pellucidus ''Phaxas pellucidus'', the transparent razor shell, is a species of marine bivalve mollusc in the family Pharidae. It is found buried in the seabed in coastal waters of northwest Europe, often in great numbers. Description ''P. pellucidus' ...'' (Pennant, 1777) * '' Phaxas tenellus'' Cosel, 1993 Species brought into synonymy: * ''Phaxas adriaticus'' (Coen, 1933): synonym of ''Phaxas pellucidus'' (Pennant, 1777) * ''Phaxas cultellus'' (Linnaeus, 1758): synonym of '' Ensiculus cultellus'' (Linnaeus, 1758) * ''Phaxas decipiens'' (E. A. Smith, 1904) accepted as '' Afrophaxas decipiens'' (E. A. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Elford Leach
William Elford Leach Royal Society, FRS (2 February 1791 – 25 August 1836) was an English zoologist and marine biologist. Life and work Elford Leach was born at Hoe Gate, Plymouth, the son of an attorney. At the age of twelve he began a medical apprenticeship at the Royal Devon and Exeter Hospital, Devonshire and Exeter Hospital, studying anatomy and chemistry. By this time he was already collecting marine animals from Plymouth Sound and along the Devon coast. At seventeen he began studying medicine at St Bartholomew's Hospital in London, finishing his training at the University of Edinburgh before graduating Doctor of Medicine, MD from the University of St Andrews (where he had never studied). From 1813 Leach concentrated on his zoological interests and was employed as an 'Assistant Librarian' (what would later be called Assistant Keeper) in the Natural History Museum, London, Natural History Department of the British Museum, where he had responsibility for the zoological ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus comes above species and below family (taxonomy), family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family ( la, familia, plural ') 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 the "walnut family". What belongs to a family—or if a described family should be recognized at all—are proposed and determined by practicing taxonomists. There are no hard rules for describing or recognizing a family, but in plants, they can be characterized on the basis of both vegetative and reproductive features of plant species. Taxonomists often take different positions about descriptions, and there may be no broad consensus across the scientific community for some time. The publishing of new data and opini ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pharidae
Pharidae is a taxonomic family of saltwater clams, marine bivalve molluscs in the order Adapedonta. This family of clams is related to the razor shells, a family which is considered to include Pharidae by some authorities. Genera Genera within the family Pharidae include: * '' Afrophaxas'' Cosel, 1993 * '' Cultellus'' Schumacher, 1817 * '' Ensiculus'' H. Adams, 1860 * ''Ensis'' Schumacher, 1817 * '' Leguminaria'' Schumacher, 1817 * '' Nasopharus'' Cosel, 1993 * '' Neosiliqua'' Habe, 1965 * '' Novaculina'' Benson, 1830 * '' Orbicularia'' Deshayes, 1850 * '' Pharella'' Gray, 1854 * '' Pharus'' Leach in Brown, 1844 * '' Phaxas'' Leach in Gray, 1852 * ''Siliqua'' Megerle von Mühlfeld, 1811 * ''Sinonovacula ''Sinonovacula'' is a genus of bivalves. Species include: *''Sinonovacula constricta ''Sinonovacula constricta'', the constricted tagelus, Chinese razor clam or Agemaki clam, is a commercially important species of bivalve native to th ...'' Prashad, 1924 * '' Sinucu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Suspension Feeder
Filter feeders are a sub-group of suspension feeding animals that feed by straining suspended matter and food particles from water, typically by passing the water over a specialized filtering structure. Some animals that use this method of feeding are clams, krill, sponges, baleen whales, and many fish (including some sharks). Some birds, such as flamingos and certain species of duck, are also filter feeders. Filter feeders can play an important role in clarifying water, and are therefore considered ecosystem engineers. They are also important in bioaccumulation and, as a result, as indicator organisms. Fish Most forage fish are filter feeders. For example, the Atlantic menhaden, a type of herring, lives on plankton caught in midwater. Adult menhaden can filter up to four gallons of water a minute and play an important role in clarifying ocean water. They are also a natural check to the deadly red tide. Extensive article on the role of menhaden in the ecosystem and possible r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phaxas Pellucidus
''Phaxas pellucidus'', the transparent razor shell, is a species of marine bivalve mollusc in the family Pharidae. It is found buried in the seabed in coastal waters of northwest Europe, often in great numbers. Description ''P. pellucidus'' is a very small razor shell seldom exceeding in length. The colour is cream or dull white, sometimes with reddish markings. The periostracum is olive-coloured and glossy. The two elongated valves are fragile and equal in size. The dorsal side of each is straight while the ventral side is slightly curved giving a pod-like appearance. The anterior end is rounded while the posterior end is slightly truncate. There are fine sculptured lines parallel to the margins, which are themselves smooth. The ligament joining the valves is external and located close to the beaks which are very close to the anterior end. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phaxas Tenellus
''Phaxas'' is a genus of small razor shells in the family Pharidae. Members of the genus have a pair of elongate valves and live in soft sediments on the sea bed. They have a muscular foot with which they can dig rapidly and a short siphon which they extend to the surface of the substrate. They are suspension feeders. Species The following species are recognised: * ''Phaxas pellucidus ''Phaxas pellucidus'', the transparent razor shell, is a species of marine bivalve mollusc in the family Pharidae. It is found buried in the seabed in coastal waters of northwest Europe, often in great numbers. Description ''P. pellucidus' ...'' (Pennant, 1777) * '' Phaxas tenellus'' Cosel, 1993 Species brought into synonymy: * ''Phaxas adriaticus'' (Coen, 1933): synonym of ''Phaxas pellucidus'' (Pennant, 1777) * ''Phaxas cultellus'' (Linnaeus, 1758): synonym of '' Ensiculus cultellus'' (Linnaeus, 1758) * ''Phaxas decipiens'' (E. A. Smith, 1904) accepted as '' Afrophaxas decipiens'' (E. A. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bivalve Genera
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. As a group, bivalves 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. The shell of a bivalve is composed of calcium ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
