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Abyssochrysos
''Abyssochrysos'' is a genus of bathyal sea snails, marine gastropod mollusks in the family Abyssochrysidae. Description The characteristics (shell, radula and anatomy) of the species mark this genus as simple gastropods, unassigned in the clade Caenogastropoda. Their taenioglossate radula (formula: 2+1+1+1+2) is unique among the Prosobranchia because of the sickle-shaped rachidian tooth and the thick, sinuous, sharply cusped lateral teeth. They have tentacles but lack eyes. The mantle cavity goes deep (about 2½ whorl A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). Whorls in nature File:Photograph and axial plane floral ...s). The long, wide ctenidium is monopectinate. The pallial gonoducts are closed. The large penis-like organ is a right-dorsal mantle process. Species Species within the genus ''Abyssochrysos'' include: * '' Abyssoc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abyssochrysos
''Abyssochrysos'' is a genus of bathyal sea snails, marine gastropod mollusks in the family Abyssochrysidae. Description The characteristics (shell, radula and anatomy) of the species mark this genus as simple gastropods, unassigned in the clade Caenogastropoda. Their taenioglossate radula (formula: 2+1+1+1+2) is unique among the Prosobranchia because of the sickle-shaped rachidian tooth and the thick, sinuous, sharply cusped lateral teeth. They have tentacles but lack eyes. The mantle cavity goes deep (about 2½ whorl A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). Whorls in nature File:Photograph and axial plane floral ...s). The long, wide ctenidium is monopectinate. The pallial gonoducts are closed. The large penis-like organ is a right-dorsal mantle process. Species Species within the genus ''Abyssochrysos'' include: * '' Abyssoc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abyssochrysos Melanioides
''Abyssochrysos melanioides'' is a species of sea snail, a marine gastropod mollusk in the family Abyssochrysidae. This is the type specimen for which Tomlin created a new family Abyssochrisidae, but couldn't refer at the time to any superfamily. Some years later he thought it had any affinities with the families Littorinidae Children, 1834 and Thiaridae Gill, 1871 (1823). Houbrick (1979) brought the then known species of ''Abyssochrysos'' in the superfamily Loxonematacea Koken, with close affinities to the families Zygopleuridae Wenz, 1939, Paleozygopleuridae Horny, and Pseudozygopleuridae Knight, 1930. Distribution * The type specimen was dredged from a depth of 1645 m to 1828 m off the Cape of Good Hope, South Africa. * PhilippinesBouchet P. (1991). "New records and new species of ''Abyssochrysos'' (Mollusca, Caenogastropoda). ''Journal of Natural History'' 25(2): 305–313. . * Indonesia Description File:Abyssochrysos melanioides shell.png, shell File:Abyssochrysos me ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abyssochrysos Bicinctus
''Abyssochrysos bicinctus'' is a species of sea snail, a marine gastropod mollusk in the family Abyssochrysidae. Description Distribution This marine species occurs in the Makassar Strait Makassar Strait is a strait between the islands of Borneo and Sulawesi in Indonesia. To the north it joins the Celebes Sea, while to the south it meets the Java Sea. To the northeast, it forms the Sangkulirang Bay south of the Mangkalihat Pe ..., Indonesia. References * Bouchet P. (1991). ''New records and new species of Abyssochrysos (Mollusca, Caenogastropoda).'' Journal of Natural History 25(2): 305–313 bicinctus Gastropods described in 1991 {{Abyssochrysidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abyssochrysos Brasilianus
''Abyssochrysos brasilianus'' is a species of sea snail, a marine gastropod mollusk in the family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ... Abyssochrysidae. Distribution continental slope off southeastern Brazil Description The maximum recorded shell length is 23.6 mm.Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". '' PLOS One'' 5(1): e8776. doi:10.1371/journal.pone.0008776. Habitat Minimum recorded depth is 620 m. Maximum recorded depth is 1540 m. References External links * brasilianus Gastropods described in 1991 {{Abyssochrysidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abyssochrysos Melvilli
''Abyssochrysos melvilli'', common name Melvill's abyssal shell, is a species of sea snail, a marine gastropod mollusc in the family Abyssochrysidae. Description (Original description by M. Schepman) The size of the shell varies between 10 mm and 50 mm. The small, white shell has a pyramidal shape. The spire consists of 11½ whorls of which nearly 2 form the nucleus. The first whorl is rather bulbous and smooth. The second whorls is radiately ribbed and also swollen. The remaining whorls increase regularly in size. They are slightly contracted above and below, nearly straight towards the middle, with two spiral rows of pointed nodules, connected by slight spirals and oblique radiating ribs. Moreover, the shell has a thin spiral, just above the linear suture. The rest of the surface is smooth and shining, with a slight nacreous lustre and with numerous fine growth striae. The body whorl is conspicuously keeled below the periphery and with a second keel at some distan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abyssochrysos Eburneus
''Abyssochrysos eburneus'' is a species of sea snail, a marine gastropod mollusk in the family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ... Abyssochrysidae. Distribution Found off west Africa. References External links * eburneus Gastropods described in 1897 {{Abyssochrysidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abyssochrysos Xouthos
''Abyssochrysos xouthos'' is a species of sea snail, a marine gastropod mollusk in the family Abyssochrysidae. Distribution This marine species occurs off Oman Oman ( ; ar, عُمَان ' ), officially the Sultanate of Oman ( ar, سلْطنةُ عُمان ), is an Arabian country located in southwestern Asia. It is situated on the southeastern coast of the Arabian Peninsula, and spans the mouth of t .... References * xouthos Gastropods described in 2000 {{Abyssochrysidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abyssochrysidae
Abyssochrysidae is a family of sea snails, marine gastropod mollusks in the clade Caenogastropoda (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). Taxonomy The family Abyssochrysidae was previously placed in the "Zygopleuroid group" (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). This family has no subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). In 2008, the sister group Provannidae was moved into the superfamily Abyssochrysoidea Tomlin, 1927 by Kain et al. and the family Abyssochrysidae was also moved into the superfamily Abyssochrysoidea.WoRMS (2009). Abyssochrysidae. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2009) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=345309 on 2010-05-04 Genera Genera within this family include: * '' Acanthostrophia'' ** '' Acanthostrophia acanthica'' - a fossil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mollusca
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 gastropod ... [...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] |
Ctenidium (mollusc)
A ctenidium is a respiratory organ or gill which is found in many molluscs. This structure exists in bivalves, cephalopods, Polyplacophorans (chitons), and in aquatic gastropods such as freshwater snails and marine snails. Some aquatic gastropods possess one ctenidium known as monopectinate and others have a pair of ctenidia known as bipectinate. A ctenidium is shaped like a comb or a feather, with a central part from which many filaments or plate-like structures protrude, lined up in a row. It hangs into the mantle cavity and increases the area available for gas exchange. The apple snail. Retrieved 2012-04-20. The word is Latinized but is derived from the ''ktenidion'' which means "litt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whorl (mollusc)
A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in numerous gastropods, but it is also found in shelled cephalopods including ''Nautilus'', ''Spirula'' and the large extinct subclass of cephalopods known as the ammonites. A spiral shell can be visualized as consisting of a long conical tube, the growth of which is coiled into an overall helical or planispiral shape, for reasons of both strength and compactness. The number of whorls which exist in an adult shell of a particular species depends on mathematical factors in the geometric growth, as described in D'Arcy Wentworth Thompson's classic 1917 book ''On Growth and Form'', and by David Raup. The main factor is how rapidly the conical tube expands (or flares-out) over time. When the rate of expansion is low, such that each subsequent whorl is not that much wider than the previous one, then the adult shell has numerous whorls. When the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
