|
Ammonicera Eocaenica
''Ammonicera eocaenica'' is an extinct species of minute sea snail, a marine gastropod mollusc in the family Omalogyridae. Distribution Fossils of this species were found in Eocene strata in Île-de-France and Loire-Atlantique Loire-Atlantique (; Gallo language, Gallo: ''Louére-Atantique''; ; before 1957: ''Loire-Inférieure'', ) is a departments of France, department in Pays de la Loire on the west coast of France, named after the river Loire and the Atlantic Ocean. ..., France. References * External links * eocaenica Gastropods described in 1923 {{paleo-gastropod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. Other ways of defining species include their karyotype, DNA sequence, morphology (biology), morphology, behaviour, or ecological niche. In addition, palaeontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. About 14% of these had been described by 2011. All species (except viruses) are given a binomial nomenclature, two-part name, a "binomen". The first part of a binomen is the name of a genus to which the species belongs. The second part is called the specific name (zoology), specific name or the specific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Snail
Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the absence of a visible Gastropod shell, shell. Definition Determining whether some gastropods should be called sea snails is not always easy. Some species that live in brackish water (such as certain Neritidae, neritids) can be listed as either freshwater snails or marine snails, and some species that live at or just above the high tide level (for example, species in the genus ''Truncatella (gastropod), Truncatella'') are sometimes considered to be sea snails and sometimes listed as land snails. Anatomy Sea snails are a very large and diverse group of animals. Most snails that live in salt water respire using a gill or gills; a few species, though, have a lung, are intertidal, and are active only at low tide w ... [...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] |
Gastropod
Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and from the land. There are many thousands of species of sea snails and sea slug, slugs, as well as freshwater snails, freshwater limpets, land snails and slugs. The class Gastropoda is a diverse and highly successful class of mollusks within the phylum Mollusca. It contains a vast total of named species, second only to the insects in overall number. The fossil history of this class goes back to the Furongian, Late Cambrian. , 721 family (taxonomy), families of gastropods are known, of which 245 are extinct and appear only in the fossil record, while 476 are currently neontology, extant living fossil, with or without a fossil record. Gastropoda (previously known as univalves and sometimes spelled "Gasteropoda") are a major part of the phylum Mo ... [...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] |
Omalogyridae
Omalogyridae are a family of minute and microscopic sea snails, marine gastropod molluscs or micromolluscs in the informal group Lower Heterobranchia.Gofas, S. (2012). Omalogyridae. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=1742 on 2012-08-31 Adult shells are usually smaller than 1 millimeter. This family is poorly known and is tentatively placed in the unresolved infraclass "Lower Heterobranchia". Studies of this group are sketchy and miss or omit the basic information about taxonomy or distribution. Bieler R & Mikkelsen P. (1998), Ammonicera in Florida - Notes on the smallest living gastropod in the United States and comments on other species of Omalogyridae (Heterobranchia); The Nautilus, 111(1):1-12, 1998 Genera Genera within the family Omalogyridae include: * ''Ammonicera ''Ammonicera'' is a genus of minute sea snails, marine gastropod molluscs or micromollusks in the family Omalogyridae.Bouchet, P.; ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene
The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes from the Ancient Greek (''Ēṓs'', 'Eos, Dawn') and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch.See: *Letter from William Whewell to Charles Lyell dated 31 January 1831 in: * From p. 55: "The period next antecedent we shall call Eocene, from ήως, aurora, and χαινος, recens, because the extremely small proportion of living species contained in these strata, indicates what may be considered the first commencement, or ''dawn'', of the existing state of the animate creation." The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isoto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
ÃŽle-de-France
The ÃŽle-de-France (; ; ) is the most populous of the eighteen regions of France, with an official estimated population of 12,271,794 residents on 1 January 2023. Centered on the capital Paris, it is located in the north-central part of the country and often called the Paris Region (, ). ÃŽle-de-France is densely populated and retains a prime economic position on the national stage, and it covers , about 2% of Metropolitan France, metropolitan French territory. Its 2017 population was nearly one-fifth of the national total. The region is made up of eight administrative Departments of France, departments: Paris, Essonne, Hauts-de-Seine, Seine-Saint-Denis, Seine-et-Marne, Val-de-Marne, Val-d'Oise and Yvelines. It was created as the "District of the Paris Region" in 1961. In 1976, when its status was aligned with the French administrative regions created in 1972, it was renamed after the historic province of ÃŽle-de-France. Residents are sometimes referred to as ''Franciliens'', an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Loire-Atlantique
Loire-Atlantique (; Gallo language, Gallo: ''Louére-Atantique''; ; before 1957: ''Loire-Inférieure'', ) is a departments of France, department in Pays de la Loire on the west coast of France, named after the river Loire and the Atlantic Ocean. It had a population of 1,429,272 in 2019.Populations légales 2019: 44 Loire-Atlantique INSEE History Loire-Atlantique is one of the original 83 departments created during the French Revolution on March 4, 1790. Originally, it was named Loire-Inférieure, but its name was changed in March 9, 1957 to Loire-Atlantique. The area was formed from the Province of Brittany, and contains what many people still consider to be Brittany's capital, Nantes. However, during World War II, the Vichy Government set up a s ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonicera
''Ammonicera'' is a genus of minute sea snails, marine gastropod molluscs or micromollusks in the family Omalogyridae.Bouchet, P.; Gofas, S. (2012). ''Ammonicera'' Vayssière, 1893. Accessed through: World Register of Marine * At http://www.marinespecies.org/aphia.php?p=taxdetails&id=138275 on 2012-08-31 They are found in various locations such as the Eastern Pacific coasts of the United States and Mexico, Japan, and the Mediterranean. This genus comprises the smallest gastropods known, featuring discoid, planispiral shells that typically measure in the adult state 1 mm or even less in size. The protoconch is characterized by distinct ridges and grooves. The teleoconch typically displays prominent sculpture, though it is occasionally weak. The aperture ranges from rounded to subquadrate. The diet of the Ammonicera is not confirmed, however, based on the diets of other Omalogyridae, it is assumed to feed on several algal species in its habitat. Species Species within the gen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
