|
Pleurotomariidae
Pleurotomariidae, common name the "slit snails", is a family of large marine gastropods in the superfamily Pleurotomarioidea of the subclass Vetigastropoda. This family is a very ancient lineage; there were numerous species in the geological past. The genus includes several hundred fossil forms, mostly Paleozoic. It is one of the oldest gastropod families, commencing in the Cambrian. The superfamily is currently represented by a group of species that live only in deep water. This family has no subfamilies. The first living specimens of a species in this family, '' Perotrochus quoyanus'', were dredged in 1879 in deep water off the West Indies by the "Blake" expedition of William Healey Dall. Description The shell has a trochoidal shape. It is nacreous within. It is umbilicate or imperforate, having a deep slit or sinus in the outer superior margin of the peristome, which serves the purpose of an exhalant phase of respiration., and leaves on the corresponding part of the whorls ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mikadotrochus
''Mikadotrochus'' is a genus of sea snails, marine gastropod mollusks in the family Pleurotomariidae, the slit snails. Species Species within the genus ''Mikadotrochus'' include: * '' Mikadotrochus beyrichii'' ( Hilgendorf, 1877) * '' Mikadotrochus gotoi'' (Anseeuw, 1990) * '' Mikadotrochus hirasei hirasei'' (Pilsbry, 1903) ** '' Mikadotrochus hirasei yamamotoi'' (A. Yamamoto, 1993), Species inquirenda * '' Mikadotrochus mikadotrochus'' Pilsbry Henry Augustus Pilsbry (7 December 1862 – 26 October 1957) was an American biologist, malacologist and carcinologist, among other areas of study. He was a dominant presence in many fields of invertebrate taxonomy for the better part of a centu ... * '' Mikadotrochus salmianus'' (Rolle, 1887) * ''Mikadotrochus nantoensis''Lin，1975: ;Species brought into synonymy : * ''Mikadotrochus amabilis'' Bayer, 1963: synonym of '' Perotrochus amabilis'' (Bayer, 1963) * ''Mikadotrochus anseeuwi'' Kanazawa & Y. Goto, 1991: synonym of '' Perotrochu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bayerotrochus
''Bayerotrochus'' is a genus of sea snails, marine gastropod mollusks in the family Pleurotomariidae. The generic name ''Bayerotrochus'' is in honor of marine biologist Frederick Bayer.Cairns S. D. (2008). "Frederick M. Bayer – Commissioner 1972-1995, octocoral taxonomist and Smithsonian curator". '' Bulletin of Zoological Nomenclature'' 65(2)86-87 The shells of the snails in this genus show a selenizone. Species Species within the genus ''Bayerotrochus'' include: *'' Bayerotrochus africanus'' ( Tomlin, 1948) *'' Bayerotrochus boucheti'' (Anseeuw & Poppe, 2001) *'' Bayerotrochus charlestonensis'' (Askew, 1988) *'' Bayerotrochus diluculum'' (Okutani, 1979) *'' Bayerotrochus indicus'' (Anseeuw, 1999) *'' Bayerotrochus midas'' (Bayer, 1966) *'' Bayerotrochus philpoppei'' Anseeuw, Poppe & Goto, 2006 *'' Bayerotrochus poppei'' Anseeuw, 2003 *'' Bayerotrochus pyramus'' (Bayer, 1967) *'' Bayerotrochus quiquandoni'' Cossignani, 2018 *'' Bayerotrochus tangaroanus'' (Bouchet & Métiv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Entemnotrochus Adansonianus
''Entemnotrochus adansonianus'', common name Adanson's slit shell, is a species of sea snail, a marine gastropod mollusk in the family Pleurotomariidae. ;Subspecies: * ''Entemnotrochus adansonianus adansonianus'' (Crosse & Fischer, 1861) * ''Entemnotrochus adansonianus bermudensis'' Okutani & Goto, 1983 Description The length of the shell varies between 80 mm and 190 mm. This attractive species has a pale yellowish-fleshy color with numerous, irregular, reddish spots, sometimes vivid, sometimes more or less effaced. The shell has a trochiform shape above, but is plano-convex beneath and concave in the middle. It is concentrically costate-sulcate with granulose ribs. It has many longitudinal wrinkles. The acuminate apex is smooth and yellowish. The 11 whorls increase slowly and are rather planulate at the sutures. The shell is unequally divided by the slit fasciole. Below it is traversed by 7 to 8 spiral granose ribs, above it with longitudinal, oblique, rather ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Entemnotrochus Rumphii
''Entemnotrochus rumphii'', common name the Rumphius' slit shell, is a species of large sea snail with gills and an operculum, a marine gastropod mollusk in the family Pleurotomariidae, the slit snails.Bouchet, P. (2011). Entemnotrochus rumphii (Schepman, 1879). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=467983 on 2011-04-03 Distribution This marine species occurs off Japan, Taiwan and the Philippines. Description The width of this large gastropod shell is 130–285 mm. The shell has a broadly conoid shape with a convex base. It is moderately umbilicated, the umbilicus penetrating to the apex. It is a little plicated within by the prominent growth lines. The color is yellowish-white, with flames of orange or carmine red, and light violet, particularly developed on the body whorl. The apex is eroded and yellow. The number of whorls is uncertain, probably between 11 and 13. The whorls are visibly convex a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Entemnotrochus
''Entemnotrochus'' is a genus of large to very large deepwater sea snails with gills and an operculum, marine gastropod mollusks in the family Pleurotomariidae, the slit snails. MolluscaBase eds. (2020). MolluscaBase. Entemnotrochus P. Fischer, 1885. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=413448 on 2020-11-03 Extant Species According to the World Register of Marine Species (WoRMS), the following species with valid names are included within the genus ''Entemnotrochus'' : * ''Entemnotrochus adansonianus'' (Crosse & Fischer, 1861) * ''Entemnotrochus rumphii ''Entemnotrochus rumphii'', common name the Rumphius' slit shell, is a species of large sea snail with gills and an operculum, a marine gastropod mollusk in the family Pleurotomariidae, the slit snails.Bouchet, P. (2011). Entemnotrochus rumphii ...'' ( Schepman, 1879) ;Species brought into synonymy : * ''Entemnotrochus urashima'' Shikama & Oishi in Shikam ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleurotomarioidea
Pleurotomarioidea is a superfamily of small to large marine gastropods included in the order Pleurotomariida of the subclass Vetigastropoda. These are the slit shells, originally named Pleurotomariacea, in keeping with the convention for naming superfamilies at the time. This updated version of the name for the taxon is usually used by students of the living Mollusca. Paleontologists often still use the name Pleurotomariacea instead. Evolutionary history Forming the first evidence of crown-group gastropods when they appeared in the Upper Cambrian, the fossil record of the Pleurotomarioideans has no substantial gaps until today. The group took quite a hit at the Cretaceous–Paleogene boundary (K–T boundary), with only the Pleurotomariidae surviving the Cretaceous–Paleogene extinction event – and then only in deep waters. Living representatives of the group were first discovered in the mid-19th century, and their unusual mix of primitive and derived characters perple ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perotrochus Quoyanus
''Perotrochus quoyanus'' is a species of large sea snail, a marine gastropod mollusk in the family Pleurotomariidae, the slit snails.Bouchet, P.; Rosenberg, G. (2012). ''Perotrochus quoyanus'' (P. Fischer & Bernardi, 1856). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=467973 on 2013-02-16 ;Subspecies: * ''Perotrochus quoyanus insularis'' Okutani & Goto, 1985 (synonym: ''Perotrochus insularis'' Okutani & Goto, 1985 ) * ''Perotrochus quoyanus quoyanus'' (P. Fischer & Bernardi, 1856) (synonyms: ''Pleurotomaria quoyana'' Fischer & Bernardi, 1856; ''Perotrochus gemma'' F. M. Bayer, 1966; ''Perotrochus coltrorum'' Rios, 2003) Description The shell of ''Perotrochus quoyanus quoyanus'' has a trochiform shape. It is obtusely carinated, with the base rounded, flattened and concave but not umbilicated. The spire is turbinate, terminating in an acuminate apex. The nine, granulose whorls are slowly increasing. They are rounded ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radula
The radula (, ; plural radulae or radulas) is an anatomical structure used by molluscs for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the esophagus. The radula is unique to the molluscs, and is found in every class of mollusc except the bivalves, which instead use cilia, waving filaments that bring minute organisms to the mouth. Within the gastropods, the radula is used in feeding by both herbivorous and carnivorous snails and slugs. The arrangement of teeth ( denticles) on the radular ribbon varies considerably from one group to another. In most of the more ancient lineages of gastropods, the radula is used to graze, by scraping diatoms and other microscopic algae off rock surfaces and other substrates. Predatory marine snails such as the Naticidae use the radula plus an acidic secretion to bore through the shell of other molluscs. Other predatory marine snails ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesopelagic Zone
The mesopelagic zone (Greek μέσον, middle), also known as the middle pelagic or twilight zone, is the part of the pelagic zone that lies between the photic epipelagic and the aphotic bathypelagic zones. It is defined by light, and begins at the depth where only 1% of incident light reaches and ends where there is no light; the depths of this zone are between approximately 200 to 1,000 meters (~656 to 3,280 feet) below the ocean surface. The mesopelagic zone occupies about 60% of the planet's surface and about 20% of the ocean's volume, amounting to a large part of the total biosphere. It hosts a diverse biological community that includes bristlemouths, blobfish, bioluminescent jellyfish, giant squid, and a myriad of other unique organisms adapted to live in a low-light environment. It has long captivated the imagination of scientists, artists and writers; deep sea creatures are prominent in popular culture. Physical conditions The mesopelagic zone includes the reg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trochidae
The Trochidae, common name top-snails or top-shells, are a family of various sized sea snails, marine gastropod molluscs in the subclass Vetigastropoda. This family is commonly known as the top-snails because in many species the shell resembles a toy spinning top. Taxonomy The family Trochidae consists of the following subfamilies: * Alcyninae Williams, Donald, Spencer & Nakano, 2010 * Cantharidinae Gray, 1857 * Carinotrochinae S.-Q. Zhang, J. Zhang & S.-P. Zhang, 2020 * Chrysostomatinae Williams, Donald, Spencer & Nakano, 2010 * Fossarininae Bandel, 2009 * Halistylinae Keen, 1958 * Kaiparathininae B. A. Marshall, 1993 * Monodontinae Gray, 1857 * Stomatellinae Gray, 1840 * Trochinae Rafinesque, 1815 * Umboniinae H. Adams & A. Adams, 1854 (1840) Additionally, the following genera have not yet been placed in any subfamily: * '' Callumbonella'' Thiele, 1924 * †'' Coeloconulus'' Nützel, 2012 * '' Enida'' A. Adams, 1860 * †'' Eocalliostoma'' O. Haas, 1953 * †'' Fa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seymour Island
Seymour Island or Marambio Island, is an island in the chain of 16 major islands around the tip of the Graham Land on the Antarctic Peninsula. Graham Land is the closest part of Antarctica to South America. It lies within the section of the island chain that resides off the west side of the peninsula's northernmost tip. Within that section, it is separated from Snow Hill Island by Picnic Passage, and sits just east of the larger key, James Ross Island, and its smaller, neighboring island, Vega Island. Seymour Island is sometimes called Marambio Island or Seymour-Marambio Island, taking its resident Argentine base as its namesake (see section, Base Antárctica Marambio, below). Historic site A wooden plaque and rock cairn stand at Penguins Bay, on the southern coast of Seymour Island. The plaque was placed on 10 November 1903 by the crew of the Argentinian Corvette ''Uruguay'' on a mission to rescue the members of the Swedish expedition led by Otto Nordenskiöld. The inscript ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
