Lopha

	Lopha ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * '' Lopha capsa'' Fischer von Waldheim, 1808 * '' Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * '' Lopha imbricata'' J. B. Lamarck, 1819 * '' Lopha rosacea'' G. P. Deshayes, 1836 Fossil species '' Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Capsa ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * '' Lopha capsa'' Fischer von Waldheim, 1808 * '' Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * '' Lopha imbricata'' J. B. Lamarck, 1819 * '' Lopha rosacea'' G. P. Deshayes, 1836 Fossil species '' Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Chemnitzii ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * ''Lopha capsa'' Fischer von Waldheim, 1808 * '' Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * '' Lopha imbricata'' J. B. Lamarck, 1819 * '' Lopha rosacea'' G. P. Deshayes, 1836 Fossil species '' Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Gregarea ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * ''Lopha capsa'' Fischer von Waldheim, 1808 * ''Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * '' Lopha imbricata'' J. B. Lamarck, 1819 * '' Lopha rosacea'' G. P. Deshayes, 1836 Fossil species '' Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Rosacea ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * ''Lopha capsa'' Fischer von Waldheim, 1808 * ''Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * '' Lopha imbricata'' J. B. Lamarck, 1819 * '' Lopha rosacea'' G. P. Deshayes, 1836 Fossil species ''Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In the g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Imbricata ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * ''Lopha capsa'' Fischer von Waldheim, 1808 * ''Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * '' Lopha imbricata'' J. B. Lamarck, 1819 * ''Lopha rosacea'' G. P. Deshayes, 1836 Fossil species ''Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In the ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Frons ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * ''Lopha capsa'' Fischer von Waldheim, 1808 * ''Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * ''Lopha imbricata'' J. B. Lamarck, 1819 * ''Lopha rosacea'' G. P. Deshayes, 1836 Fossil species ''Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In the geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Affinis ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * ''Lopha capsa'' Fischer von Waldheim, 1808 * ''Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * ''Lopha frons'' C. Linnaeus, 1758 * ''Lopha imbricata'' J. B. Lamarck, 1819 * ''Lopha rosacea'' G. P. Deshayes, 1836 Fossil species ''Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In the geol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Cristagalli ''Lopha cristagalli'', the cockscomb oyster, is a species of marine bivalve molluscs in the family Ostreidae The Ostreidae, the true oysters, include most species of molluscs commonly consumed as oysters. Pearl oysters are not true oysters, and belong to the order Pteriida. Like scallops, true oysters have a central adductor muscle, which means the .... Description The cockscomb oyster has a shell reaching a maximum diameter of about 20.5 cm, commonly 10 cm. It has a variable coloration, dark to light purple, and it is a thick, strongly ribbed, and slightly inequivalve shell. The shell inside is porcelaneous, usually purplish-brown or whitish in colour. The margins of the valves have a characteristic zig-zag pattern. The surfaces of both valves have many small, low, and rounded protuberances. These molluscs are stationary epifaunal suspension feeders, as they feed filtering sea water to extract the nutrients. Distribution and habitat This species is wides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Marshii ''Lopha marshii'' is a fossil species of true oyster, a marine bivalve mollusc in the family Ostreidae, the true oysters. This species was present in the Bajocian In the geologic timescale, the Bajocian is an age and stage in the Middle Jurassic. It lasted from approximately 170.3 Ma to around 168.3 Ma (million years ago). The Bajocian Age succeeds the Aalenian Age and precedes the Bathonian Age. Stra ... age (about 170 mya). References BiolibPaleobiology Database Sepkoski, Jac Sepkoski's Online Genus Database Ostreidae [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
picture info	Ostreidae The Ostreidae, the true oysters, include most species of molluscs commonly consumed as oysters. Pearl oysters are not true oysters, and belong to the order Pteriida. Like scallops, true oysters have a central adductor muscle, which means the shell has a characteristic central scar marking its point of attachment. The shell tends to be irregular as a result of attaching to a substrate. Both oviparous (egg-bearing) and larviparous (larvae-bearing) species are known within Ostreidae. Both types are hermaphrodites. However, the larviparous species show a pattern of alternating sex within each individual, whereas the oviparous species are simultaneous hermaphrodites, producing either female or male gametes according to circumstances. Members of genus ''Ostrea'' generally live continually immersed and are quite flat, with roundish shells. They differ from most bivalves by having shells completely made up of calcite, but with internal muscle scars of aragonitic composition. They fare ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Bajocian In the geologic timescale, the Bajocian is an age and stage in the Middle Jurassic. It lasted from approximately 170.3 Ma to around 168.3 Ma (million years ago). The Bajocian Age succeeds the Aalenian Age and precedes the Bathonian Age. Stratigraphic definitions The Bajocian Stage takes its name from the Latin name (Bajocae) of the town of Bayeux, in the region of Normandy in France. The stage was named and introduced in scientific literature by French palaeontologist Alcide d'Orbigny in 1842. The base of the Bajocian stage is defined as the place in the stratigraphic column where fossils of the ammonite genus ''Hyperlioceras'' first appear. A global reference profile (a GSSP) for the base is located at Murtinheira, close to Cabo Mondego in Portugal.The GSSP is described by Pavia & Enay (1997) The top of the Bajocian (the base of the Bathonian) is at the first appearance of ammonite species ''Parkinsonia convergens''. Subdivision The Bajocian is often divided into Lower/Early ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Oxfordian (stage) The Oxfordian is, in the ICS' geologic timescale, the earliest age of the Late Jurassic Epoch, or the lowest stage of the Upper Jurassic Series. It spans the time between 163.5 ± 1.0 Ma and 157.3 ± 1.0 Ma (million years ago). The Oxfordian is preceded by the Callovian and is followed by the Kimmeridgian. Stratigraphic definitions The Oxfordian Stage was called "Clunch Clay and Shale" by William Smith (1815–1816); in 1818 W. Buckland described them under the unwieldy title "Oxford, Forest or Fen Clay". The term Oxfordian was introduced by Alcide d'Orbigny in 1844. The name is derived from the English city of Oxford, where the beds are well developed, but they crop out almost continuously from Dorset to the coast of Yorkshire, generally forming low, broad valleys. They are well exposed at Weymouth, Oxford, Bedford, Peterborough, and in the cliffs at Scarborough, Red Cliff and Gristhorpe Bay. Rocks of this age are found also in Uig and Skye. The base of the Oxfordian Stage ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]

	Lopha ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * '' Lopha capsa'' Fischer von Waldheim, 1808 * '' Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * '' Lopha imbricata'' J. B. Lamarck, 1819 * '' Lopha rosacea'' G. P. Deshayes, 1836 Fossil species '' Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Capsa ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * '' Lopha capsa'' Fischer von Waldheim, 1808 * '' Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * '' Lopha imbricata'' J. B. Lamarck, 1819 * '' Lopha rosacea'' G. P. Deshayes, 1836 Fossil species '' Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Chemnitzii ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * ''Lopha capsa'' Fischer von Waldheim, 1808 * '' Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * '' Lopha imbricata'' J. B. Lamarck, 1819 * '' Lopha rosacea'' G. P. Deshayes, 1836 Fossil species '' Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Gregarea ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * ''Lopha capsa'' Fischer von Waldheim, 1808 * ''Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * '' Lopha imbricata'' J. B. Lamarck, 1819 * '' Lopha rosacea'' G. P. Deshayes, 1836 Fossil species '' Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Rosacea ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * ''Lopha capsa'' Fischer von Waldheim, 1808 * ''Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * '' Lopha imbricata'' J. B. Lamarck, 1819 * '' Lopha rosacea'' G. P. Deshayes, 1836 Fossil species ''Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In the g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Imbricata ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * ''Lopha capsa'' Fischer von Waldheim, 1808 * ''Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * '' Lopha imbricata'' J. B. Lamarck, 1819 * ''Lopha rosacea'' G. P. Deshayes, 1836 Fossil species ''Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In the ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Frons ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * ''Lopha capsa'' Fischer von Waldheim, 1808 * ''Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * '' Lopha frons'' C. Linnaeus, 1758 * ''Lopha imbricata'' J. B. Lamarck, 1819 * ''Lopha rosacea'' G. P. Deshayes, 1836 Fossil species ''Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In the geo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Affinis ''Lopha'' is a genus of marine bivalve molluscs in the family Ostreidae. The genus ''Lopha'' is present from the Triassic period in the Lower Norian age (216.5 ± 2.0 – 203.6 ± 1.5 Mya) to the recent age. Description ''Lopha'' species have thick, strongly ribbed shells with unequal valves. The margins of the valves have a characteristic zig-zag pattern. The lower valve shows finger-like outgrowths, by which the molluscs adhere to the substrate. These molluscs are stationary, epifaunal, suspension feeders, as they feed by filtering sea water to extract the nutrients. Species * '' Lopha affinis'' Sowerby, 1871 * ''Lopha capsa'' Fischer von Waldheim, 1808 * ''Lopha chemnitzii'' Hanley, 1846 * '' Lopha cristagalli'' C. Linnaeus, 1758 * ''Lopha frons'' C. Linnaeus, 1758 * ''Lopha imbricata'' J. B. Lamarck, 1819 * ''Lopha rosacea'' G. P. Deshayes, 1836 Fossil species ''Lopha gregarea'', Oxfordian (stage) (160 mya) '' Lopha marshii'' (Sowerby, 1914), Bajocian In the geol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Cristagalli ''Lopha cristagalli'', the cockscomb oyster, is a species of marine bivalve molluscs in the family Ostreidae The Ostreidae, the true oysters, include most species of molluscs commonly consumed as oysters. Pearl oysters are not true oysters, and belong to the order Pteriida. Like scallops, true oysters have a central adductor muscle, which means the .... Description The cockscomb oyster has a shell reaching a maximum diameter of about 20.5 cm, commonly 10 cm. It has a variable coloration, dark to light purple, and it is a thick, strongly ribbed, and slightly inequivalve shell. The shell inside is porcelaneous, usually purplish-brown or whitish in colour. The margins of the valves have a characteristic zig-zag pattern. The surfaces of both valves have many small, low, and rounded protuberances. These molluscs are stationary epifaunal suspension feeders, as they feed filtering sea water to extract the nutrients. Distribution and habitat This species is wides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Lopha Marshii ''Lopha marshii'' is a fossil species of true oyster, a marine bivalve mollusc in the family Ostreidae, the true oysters. This species was present in the Bajocian In the geologic timescale, the Bajocian is an age and stage in the Middle Jurassic. It lasted from approximately 170.3 Ma to around 168.3 Ma (million years ago). The Bajocian Age succeeds the Aalenian Age and precedes the Bathonian Age. Stra ... age (about 170 mya). References BiolibPaleobiology Database Sepkoski, Jac Sepkoski's Online Genus Database Ostreidae [...More Info...] [...Related Items...] OR:* [Wikipedia] [Google] [Baidu]
picture info	Ostreidae The Ostreidae, the true oysters, include most species of molluscs commonly consumed as oysters. Pearl oysters are not true oysters, and belong to the order Pteriida. Like scallops, true oysters have a central adductor muscle, which means the shell has a characteristic central scar marking its point of attachment. The shell tends to be irregular as a result of attaching to a substrate. Both oviparous (egg-bearing) and larviparous (larvae-bearing) species are known within Ostreidae. Both types are hermaphrodites. However, the larviparous species show a pattern of alternating sex within each individual, whereas the oviparous species are simultaneous hermaphrodites, producing either female or male gametes according to circumstances. Members of genus ''Ostrea'' generally live continually immersed and are quite flat, with roundish shells. They differ from most bivalves by having shells completely made up of calcite, but with internal muscle scars of aragonitic composition. They fare ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Bajocian In the geologic timescale, the Bajocian is an age and stage in the Middle Jurassic. It lasted from approximately 170.3 Ma to around 168.3 Ma (million years ago). The Bajocian Age succeeds the Aalenian Age and precedes the Bathonian Age. Stratigraphic definitions The Bajocian Stage takes its name from the Latin name (Bajocae) of the town of Bayeux, in the region of Normandy in France. The stage was named and introduced in scientific literature by French palaeontologist Alcide d'Orbigny in 1842. The base of the Bajocian stage is defined as the place in the stratigraphic column where fossils of the ammonite genus ''Hyperlioceras'' first appear. A global reference profile (a GSSP) for the base is located at Murtinheira, close to Cabo Mondego in Portugal.The GSSP is described by Pavia & Enay (1997) The top of the Bajocian (the base of the Bathonian) is at the first appearance of ammonite species ''Parkinsonia convergens''. Subdivision The Bajocian is often divided into Lower/Early ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Oxfordian (stage) The Oxfordian is, in the ICS' geologic timescale, the earliest age of the Late Jurassic Epoch, or the lowest stage of the Upper Jurassic Series. It spans the time between 163.5 ± 1.0 Ma and 157.3 ± 1.0 Ma (million years ago). The Oxfordian is preceded by the Callovian and is followed by the Kimmeridgian. Stratigraphic definitions The Oxfordian Stage was called "Clunch Clay and Shale" by William Smith (1815–1816); in 1818 W. Buckland described them under the unwieldy title "Oxford, Forest or Fen Clay". The term Oxfordian was introduced by Alcide d'Orbigny in 1844. The name is derived from the English city of Oxford, where the beds are well developed, but they crop out almost continuously from Dorset to the coast of Yorkshire, generally forming low, broad valleys. They are well exposed at Weymouth, Oxford, Bedford, Peterborough, and in the cliffs at Scarborough, Red Cliff and Gristhorpe Bay. Rocks of this age are found also in Uig and Skye. The base of the Oxfordian Stage ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]