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Nuculida
Nuculida is an order of small saltwater clams, marine bivalve mollusks, within the subclass Protobranchia. "Nuculida" is sometimes spelled "Nuculoida". This order contains two families, the extant Nuculidae Nuculidae is a family (biology), family of small seawater, saltwater clams in the order (biology), order Nuculida. Species in this family are commonly known as nut clams. The nomenclature of the Western European species in this family is still u ... and the extinct Praenuculidae. Clams in the family Nuculidae are commonly known as nut clams. References WoRMS page for this taxon Bivalve orders {{Bivalve-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuculidae
Nuculidae is a family (biology), family of small seawater, saltwater clams in the order (biology), order Nuculida. Species in this family are commonly known as nut clams. The nomenclature of the Western European species in this family is still uncertain. Their systematics have been based mainly on their feces.WoRMS (2011). Nuculidae. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=204 on 2011-05-04 Genera * ''Acila'' H. Adams and A. Adams, 1858 * ''Adrana (bivalve), Adrana'' Adams and Adams, 1858 * ''Austronucula'' Arthur William Baden Powell, Powell, 1939 * ''Brevinucula'' Johannes Thiele (zoologist), Thiele, 1934 * ''Condylonucula'' D.R. Moore, 1977 * ''Ennucula'' Tom Iredale, Iredale, 1931 *'' Lamellinucula'' Schenck, 1944 * ''Leionucula'' Quenstedt, 1930 † * ''Linucula'' Marwick, 1931 * ''Neonucula'' Lan & Lee, 2001 * ''Nucula'' Lamarck, 1799 * ''Pronucula'' Hedley, 1902 * ''Sinonucula'' Xu, 1985 ;Genera b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protobranchia
Protobranchia is a subclass of bivalve molluscs. It contains the extant orders Nuculanida, Nuculida, and Solemyida. These are deep water clams of a small and primitive order with a taxodont hinge (composed of many similar, small teeth), generally with a central ligament pit, large labial palps which are used in deposit feeding and the gills used only for respiration, the anterior and posterior adductor muscles are nearly equal in size, a foot which is divided sagittally and longitudinally with papillate margins. The foot in Protobranchia clams is without a true byssus A byssus () is a bundle of filaments secreted by many species of bivalve mollusc that function to attach the mollusc to a solid surface. Species from several families of clams have a byssus, including pen shells ( Pinnidae), true mussels (Mytili ... gland, although they frequently have a nonhomologous byssal gland in the heel. The byssal gland in these clams does not produce threads as in Pteriomorphia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nuculoidea
Nuculoidea is a superfamily of bivalves. It belongs to the order Nuculida. It comprises one living family, Nuculidae Nuculidae is a family (biology), family of small seawater, saltwater clams in the order (biology), order Nuculida. Species in this family are commonly known as nut clams. The nomenclature of the Western European species in this family is still u ... and one extinct family Praenuculidae. References Nuculida Mollusc superfamilies {{bivalve-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nucula Nucleus
''Nucula'' is a genus of very small saltwater clams. They are part of the family Nuculidae. Fossil records This genus is very ancient. Fossils are known from the Arenig to the Quaternary (age range: from 478.6 to 0.0 million years ago). Fossils are found in the marine strata all over the world. Description Shells of species within this genus can reach a size of about . They are equivalve, symmetrical, approximately triangular. The surface has fine concentric growth lines. These clams live in the muddy sand close to the sediment surface at a depth of 20 to 200 meters. Species Nowadays there are still many species of this genus, which have had virtually no change in the course of time. Species within the genus ''Nucula'' include: * '' Nucula annulata'' Hampson, 1971 * '' Nucula atacellana'' Schenck, 1939 - cancellate nutclam * '' Nucula austrobenthalis'' Dell, 1990 * '' Nucula beachportensis'' Verco, 1907 * '' Nucula benguelana'' (A. H. Clarke, 1961) * '' Nucula brasilian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bivalve
Bivalvia () or bivalves, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class (biology), class of aquatic animal, aquatic molluscs (marine and freshwater) that have laterally compressed soft bodies enclosed by a calcified exoskeleton consisting of a hinged pair of half-bivalve shell, shells known as valve (mollusc), valves. 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 ctenidium (mollusc), ctenidia, specialised organs for feeding and breathing. Common bivalves include clams, oysters, Cockle (bivalve), cockles, mussels, scallops, and numerous other family (biology), families that live in saltwater, as well as a number of families that live in freshwater. Majority of the class are benthic filter feeders that bury themselves in sediment, where they are relatively safe from predation. Others lie on the sea floor or attach themselves to rocks or other h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Order (biology)
Order () is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between family and class. In biological classification, the order is a taxonomic rank used in the classification of organisms and recognized by the nomenclature codes. An immediately higher rank, superorder, is sometimes added directly above order, with suborder directly beneath order. An order can also be defined as a group of related families. What does and does not belong to each order is determined by a taxonomist, as is whether a particular order should be recognized at all. Often there is no exact agreement, with different taxonomists each taking a different position. There are no hard rules that a taxonomist needs to follow in describing or recognizing an order. Some taxa are accepted almost universally, while others are recognized only rarely. The name of an order is usually written with a capital letter. For some groups of organisms, their orders may follow consist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine (ocean)
The ocean is the body of salt water that covers approximately 70.8% of Earth. The ocean is conventionally divided into large bodies of water, which are also referred to as ''oceans'' (the Pacific, Atlantic, Indian, Antarctic/Southern, and Arctic Ocean),"Ocean." ''Merriam-Webster.com Dictionary'', Merriam-Webster, https://www.merriam-webster.com/dictionary/ocean . Accessed March 14, 2021. and are themselves mostly divided into seas, gulfs and subsequent bodies of water. The ocean contains 97% of [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mollusc
Mollusca is a phylum of protostome, protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant taxon, extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The number of additional fossil species is estimated between 60,000 and 100,000, and the proportion of undescribed species is very high. Many taxa remain poorly studied. Molluscs are the largest marine biology, marine phylum, comprising about 23% of all the named marine organisms. They are highly diverse, not just in size and anatomical structure, but also in behaviour and habitat, as numerous groups are freshwater mollusc, freshwater and even terrestrial molluscs, terrestrial species. The phylum is typically divided into 7 or 8 taxonomy (biology), taxonomic class (biology), classes, of which two are entirely extinct. Cephalopod molluscs, such as squid, cuttlefish, and octopuses, are among the most neurobiology, neurologi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Class (biology)
In biological classification, class () is a taxonomic rank, as well as a taxonomic unit, a taxon, in that rank. It is a group of related taxonomic orders. Other well-known ranks in descending order of size are domain, kingdom, phylum, order, family, genus, and species, with class ranking between phylum and order. History The class as a distinct rank of biological classification having its own distinctive name – and not just called a ''top-level genus'' ''(genus summum)'' – was first introduced by French botanist Joseph Pitton de Tournefort in the classification of plants that appeared in his '' Eléments de botanique'' of 1694. Insofar as a general definition of a class is available, it has historically been conceived as embracing taxa that combine a distinct ''grade'' of organization—i.e. a 'level of complexity', measured in terms of how differentiated their organ systems are into distinct regions or sub-organs—with a distinct ''type'' of construction, whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Praenuculidae
Praenuculidae is an extinct family of prehistoric bivalves in the superfamily Nuculoidea. Praenuculidae species lived from the early Ordovician, Arenig stage through the Early Devonian Emsian stage.The Paleobiology Database Praenuculidae entry accessed 11 January 2012 Praenuculidae fossils are found worldwide, present on every continent except . Species in this family are thought to have been sessile, attached to the substrate in shallow infaunal marine water environments, where they formed shells of an |
