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Discohelix Tunisiensis Apical
''Discohelix'' is a genus of extinct sea snails, marine gastropod mollusks in the family Discohelicidae Discohelicidae is an extinct family of sea snails with planispiral shells, marine gastropod mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollu ....Bouchet, P. (2015). ''Discohelix'' Dunker, 1847 †. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=536262 on 2016-12-04 Species The following species were brought into synonymy: * ''Discohelix hedleyi'' Mestayer, 1916 accepted as '' Zerotula hedleyi'' (Mestayer, 1916) The following species are alternate representation: * ''Discohelix retifera'' Dall, 1892 represented as '' Pseudotorinia retifera'' (Dall, 1892) (alternate representation), in turn accepted as '' Pseudotorinia'' (an unresolved species complex). References External links * Bi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Discohelix Tunisiensis
''Discohelix'' is a genus of extinct sea snails, marine gastropod mollusks in the family Discohelicidae Discohelicidae is an extinct family of sea snails with planispiral shells, marine gastropod mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollu ....Bouchet, P. (2015). ''Discohelix'' Dunker, 1847 †. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=536262 on 2016-12-04 Species The following species were brought into synonymy: * ''Discohelix hedleyi'' Mestayer, 1916 accepted as '' Zerotula hedleyi'' (Mestayer, 1916) The following species are alternate representation: * ''Discohelix retifera'' Dall, 1892 represented as '' Pseudotorinia retifera'' (Dall, 1892) (alternate representation), in turn accepted as '' Pseudotorinia'' (an unresolved species complex). References External links * Bi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus comes above species and below family (taxonomy), family. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species Complex
In biology, a species complex is a group of closely related organisms that are so similar in appearance and other features that the boundaries between them are often unclear. The taxa in the complex may be able to hybridize readily with each other, further blurring any distinctions. Terms that are sometimes used synonymously but have more precise meanings are cryptic species for two or more species hidden under one species name, sibling species for two (or more) species that are each other's closest relative, and species flock for a group of closely related species that live in the same habitat. As informal taxonomic ranks, species group, species aggregate, macrospecies, and superspecies are also in use. Two or more taxa that were once considered conspecific (of the same species) may later be subdivided into infraspecific taxa (taxa within a species, such as bacterial strains or plant varieties), that is complex but it is not a species complex. A species complex is in most cas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudotorinia
''Pseudotorinia'' is a genus of sea snails, marine gastropod mollusks in the family Architectonicidae, the staircase shells or sundials.Bieler, R. & Petit, R. E. (2005). "Catalogue of Recent and fossil taxa of the family Architectonicidae Gray, 1850 (Mollusca: Gastropoda)". ''Zootaxa'' 1101: 1–119PDFBouchet, P.; Gofas, S. (2014). Pseudotorinia Sacco, 1892. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=137666 on 2014-08-23 Species The following species are included in the genus ''Pseudotorinia'': * '' Pseudotorinia "architae-group"'' (temporary name) *'' Pseudotorinia aloysii'' (Selli, 1973) *'' Pseudotorinia amoena'' (Murdoch & Suter, 1906) *''Pseudotorinia architae'' (O. G. Costa, 1841) *'' Pseudotorinia armillata Bieler, 1993 *'' Pseudotorinia bullisi'' Bieler, Merrill & Boss, 1985 *'' Pseudotorinia colmani'' (Garrard, 1977) *'' Pseudotorinia concava'' (Thiele, 1925) *'' Pseudotorinia delectabilis'' (Melvill, 189 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudotorinia Retifera
''Pseudotorinia'' is a genus of sea snails, marine gastropod mollusks in the family Architectonicidae, the staircase shells or sundials.Bieler, R. & Petit, R. E. (2005). "Catalogue of Recent and fossil taxa of the family Architectonicidae Gray, 1850 (Mollusca: Gastropoda)". ''Zootaxa'' 1101: 1–119PDFBouchet, P.; Gofas, S. (2014). Pseudotorinia Sacco, 1892. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=137666 on 2014-08-23 Species The following species are included in the genus ''Pseudotorinia'': * '' Pseudotorinia "architae-group"'' (temporary name) *'' Pseudotorinia aloysii'' (Selli, 1973) *'' Pseudotorinia amoena'' (Murdoch & Suter, 1906) *''Pseudotorinia architae'' (O. G. Costa, 1841) *'' Pseudotorinia armillata Bieler, 1993 *'' Pseudotorinia bullisi'' Bieler, Merrill & Boss, 1985 *'' Pseudotorinia colmani'' (Garrard, 1977) *'' Pseudotorinia concava'' (Thiele, 1925) *'' Pseudotorinia delectabilis'' (Melvill, 189 ... [...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] |
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] |
Marine (ocean)
The ocean (also the sea or the world ocean) is the body of salt water that covers approximately 70.8% of the surface of Earth and contains 97% of Earth's water. An ocean can also refer to any of the large bodies of water into which the world ocean is conventionally divided."Ocean." ''Merriam-Webster.com Dictionary'', Merriam-Webster, |
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] |
Wilhelm Dunker
Wilhelm Dunker, full name Wilhelm Bernhard Rudolph Hadrian Dunker (21 February 1809, Eschwege – 13 March 1885, Marburg) was a German geologist, paleontologist and zoologist (specifically a malacologist). Wilhelm Dunker studied mining and metallurgical engineering in Göttingen and worked at first as a trainee with the local mining authority. Soon thereafter he was appointed a teacher of mineralogical sciences at the poly-technical school in Kassel. In 1854 he was appointed professor at the University of Marburg, at which he taught up to his death. Dunker was one of the most important malacologists of his time. He had a very extensive private collection of snails and shells, which he constantly increased by exchange with other collectors (and probably also by purchases). He maintained contacts with his contemporaries Rudolph Amandus Philippi, Ludwig Karl Georg Pfeiffer, Hugh Cuming and Johannes Albers. By exchange he also acquired numerous original specimens and typ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Matmor Formation
The Matmor Formation is a geologic formation of up to thick, that is exposed in Hamakhtesh Hagadol in southern Israel. The Matmor Formation contains fossils from a Jurassic equatorial shallow marine environment. Bivalves, gastropods, sponges, corals, echinoderms, and sclerobionts are present in the Matmor Formation to various degrees (Wilson et al., 2010). The stratigraphy of the Matmor Formation consists of alternating layers of limestone and marl (Hirsch and Roded, 1996). Stratigraphy The Iraq Petroleum Company originally described the Jurassic sequence in Hamakhtesh Hagadol of Israel in the 1930s (Hudson, 1958). These findings were later described and published by Blake (1935). Shaw (1947) published a limited summary of the stratigraphy. Hudson (1958) later subdivided the rocks into the Callovian, Divesian, Argovian, Sequanim biostratigraphic stages. In 1963, Goldberg subdivided the section into the Zohar, Kidod and Be'er Sheva Formations. Goldberg (1963) further divi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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