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Oenopota Impressa
''Oenopota impressa'' is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae. ''Pleurotoma impressa'' Mørch, 1869 is the type species of ''Nodotoma'' Bartsch, 1941 Description The length of the shell varies between 6 mm and 14 mm. The wide shell has a short spire and sloping but rather well-defined shoulder. It is densely costulate longitudinally, crossed by about ten spiral riblets, forming a cancellated surface. Its color is a yellowish ash. Distribution This species occurs in European waters and i ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Snail
Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the absence of a visible 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 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'') are sometimes considered to be sea snails and sometimes listed as land snails. Anatomy Sea snails are a very large group of animals and a very diverse one. 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 when they can move around in the air. These air-breathing species includ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod
The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. There are many thousands of species of sea snails and slugs, as well as freshwater snails, freshwater limpets, and land snails and slugs. The class Gastropoda 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 Late Cambrian. , 721 families of gastropods are known, of which 245 are extinct and appear only in the fossil record, while 476 are currently extant with or without a fossil record. Gastropoda (previously known as univalves and sometimes spelled "Gasteropoda") are a major part of the phylum Mollusca, and are the most highly diversified class in the phylum, with 65,000 to 80,000 living snail and slug species. The anatomy, behavior, feeding, and re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mollusk
Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is estimated between 60,000 and 100,000 additional species. The proportion of undescribed species is very high. Many taxa remain poorly studied. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. Numerous molluscs also live in freshwater and terrestrial habitats. They are highly diverse, not just in size and anatomical structure, but also in behaviour and habitat. The phylum is typically divided into 7 or 8 taxonomic classes, of which two are entirely extinct. Cephalopod molluscs, such as squid, cuttlefish, and octopuses, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known invertebrate species. The gas ... [...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] |
Mangeliidae
Mangeliidae is a monophyletic family of small to medium-sized, predatory sea snails, marine gastropod mollusks in the superfamily Conoidea. Bouchet, P. (2011). Mangeliidae P. Fischer, 1883. In: MolluscaBase (2016). Accessed through: World Register of Marine Species at http://marinespecies.org/aphia.php?p=taxdetails&id=153853 on 2017-02-23Bouchet P. & Rocroi J.-P. (Ed.) (2005). "Classification and nomenclator of gastropod families". ''Malacologia'' 47(1-2). . 397 pp. Prior to 2011, both the subfamilies Mangeliinae and Oenopotinae had been placed in the family Conidae. In 2011, Bouchet, Kantor ''et al'' merged the two subfamilies into one taxon, which they elevated to the rank of family. This was based on anatomical characters and a dataset of molecular sequences of three gene fragments. Mangeliidae is a sister-clade to the family Raphitomidae As with their relatives in the family Conidae, species in the family Mangelidae use potent venoms to catch their prey. Through this cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spire (mollusc)
A spire is a part of the coiled shell of molluscs. The spire consists of all of the whorls except for the body whorl. Each spire whorl represents a rotation of 360°. A spire is part of the shell of a snail, a gastropod mollusc, a gastropod shell, and also the whorls of the shell in ammonites, which are fossil shelled cephalopods. In textbook illustrations of gastropod shells, the tradition (with a few exceptions) is to show most shells with the spire uppermost on the page. The spire, when it is not damaged or eroded, includes the protoconch (also called the nuclear whorls or the larval shell), and most of the subsequent teleoconch whorls (also called the postnuclear whorls), which gradually increase in area as they are formed. Thus the spire in most gastropods is pointed, the tip being known as the "apex". The word "spire" is used, in an analogy to a church spire or rock spire, a high, thin, pinnacle. The "spire angle" is the angle, as seen from the apex, at which a spire ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spitzbergen
Svalbard ( , ), also known as Spitsbergen, or Spitzbergen, is a Norwegian archipelago in the Arctic Ocean. North of mainland Europe, it is about midway between the northern coast of Norway and the North Pole. The islands of the group range from 74° to 81° north latitude, and from 10° to 35° east longitude. The largest island is Spitsbergen, followed by Nordaustlandet and . The largest settlement is Longyearbyen. The islands were first used as a base by the whalers who sailed far north in the 17th and 18th centuries, after which they were abandoned. Coal mining started at the beginning of the 20th century, and several permanent communities were established. The Svalbard Treaty of 1920 recognizes Norwegian sovereignty, and the 1925 Svalbard Act made Svalbard a full part of the Kingdom of Norway. They also established Svalbard as a free economic zone and a demilitarized zone. The Norwegian Store Norske and the Russian remain the only mining companies in place. Res ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nova Zembla Island
Nova Zembla Island ("New Land") is an uninhabited island in the Qikiqtaaluk Region of Nunavut, Canada. It is located across the mouth of Coutts Inlet in Baffin Bay off the northeastern coast of Baffin Island. Round Island is to the southeast. The island was visited in 1875 by a Swedish expedition led by Adolf Erik Nordenskiöld and sponsored by the businessman Oscar Dickson. August 1875, retrieved 27 May 2014 References External links Nova Zembla Island in the |
Seahorse Islands
The Seahorse Islands is a chain of long and narrow sandy islands in western North Slope Borough, Alaska, United States. They are located between Peard Bay and the Chukchi Sea, east of Point Franklin. The longest island is about in length and the highest point of the islands is . The shape of these coastal islands has changed over the years. The Seahorse Islands were named by Captain Frederick William Beechey in 1826. Beechey had sent out his barge to explore the coastline further north. It reached the islands on August 21, 1826. Beechey, writing later, said: ''"On the 21st they arrived off a chain of sandy islands... which I have distinguished by the name of the Sea Horse Islands."'' "Sea Horse" is an antiquated term for the walrus. See also * List of islands of Alaska This is a list of islands of the U.S. state of Alaska. Approximately 2,670 named islands help to make Alaska the largest state in the United States. A B C D E F G H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aleutians
The Aleutian Islands (; ; ale, Unangam Tanangin,”Land of the Aleuts", possibly from Chukchi ''aliat'', "island"), also called the Aleut Islands or Aleutic Islands and known before 1867 as the Catherine Archipelago, are a chain of 14 large volcanic islands and 55 smaller islands. Most of the Aleutian Islands belong to the U.S. state of Alaska, but some belong to the Russian federal subject of Kamchatka Krai. They form part of the Aleutian Arc in the Northern Pacific Ocean, occupying a land area of 6,821 sq mi (17,666 km2) and extending about westward from the Alaska Peninsula toward the Kamchatka Peninsula in Russia, and act as a border between the Bering Sea to the north and the Pacific Ocean to the south. Crossing longitude 180°, at which point east and west longitude end, the archipelago contains both the westernmost part of the United States by longitude ( Amatignak Island) and the easternmost by longitude (Semisopochnoi Island). The westernmost U.S. island in real ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kodiak Island
Kodiak Island (Alutiiq: ''Qikertaq''), is a large island on the south coast of the U.S. state of Alaska, separated from the Alaska mainland by the Shelikof Strait. The largest island in the Kodiak Archipelago, Kodiak Island is the second largest island in the United States and the 80th largest island in the world, with an area of , slightly larger than Cyprus. It is long and in width ranges from . Kodiak Island is the namesake for Kodiak Seamount, which lies off the coast at the Aleutian Trench. The largest community on the island is the city of Kodiak, Alaska. Kodiak Island is mountainous and heavily forested in the north and east, but fairly treeless in the south. The island has many deep, ice-free bays that provide sheltered anchorages for boats. The southwestern two-thirds of the island, like much of the Kodiak Archipelago, is part of Kodiak National Wildlife Refuge. Kodiak Island is part of the Kodiak Island Borough and Kodiak Archipelago of Alaska. The town of Kodiak ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oenopota
''Oenopota'' is a genus of sea snails, marine gastropod mollusks in the family Mangeliidae. This genus doesn't form a monophyletic group. Therefore many species are only tentatively placed within this genus. Description In 1941 Paul Bartsch described species in this genus as having large, heavy and elongate -ovate to elongate- turreted shells. The protoconch is smooth at the apex, succeeded by a whorl with three spiral cords and rather distantly spaced axial ribs. The longitudinal ribs become stronger on succeeding whorls but evanesce at the base of the shell. The spiral sculpture weakens on succeeding whorls and finally becomes mere threads. The pear-shaped aperture is deeply channeled anteriorly. It shows in the outer lip near the summit a feeble posterior sinus. Later, in 1980, it has been stated by Bouchet & Warèn that there is a high variation within the arctic forms of this genus, such as the outer lip showing all transitions from sinuated to nonsinuated Distribut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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