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Discohelix
''Discohelix'' is a genus of extinct sea snails, marine gastropod mollusks in the family Discohelicidae.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 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 oth ...). 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.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 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 oth ...). References External links * B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vetigastropoda
Vetigastropoda is a major taxonomic group of sea snails, marine gastropod mollusks that form a very ancient lineage. Taxonomically the Vetigastropoda are sometimes treated as an order, although they are treated as an unranked clade in Bouchet and Rocroi, 2005. Vetigastropods are considered to be among the most primitive living gastropods, and are widely distributed in all oceans of the world. Their habitats range from the deep sea to intertidal zones. Many have shells with slits or other secondary openings. One of their main characteristics is the presence of intersected crossed platy shell structure. Most vetigastropods have some bilateral asymmetry of their organ systems. Description Vetigastropods range in size from approximately 0.08 in (2 mm) long in the case of Scissurelloidea or Skeneoidea, to more than 11.8 in (300 mm) in length, as with the Haliotoidea. External colours and patterns are typically drab, but such groups as the Tricolioidea and some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Discohelicidae
Discohelicidae is an extinct family of sea snails with planispiral shells, marine gastropod mollusks in the clade Vetigastropoda Vetigastropoda is a major taxonomic group of sea snails, marine gastropod mollusks that form a very ancient lineage. Taxonomically the Vetigastropoda are sometimes treated as an order, although they are treated as an unranked clade in Bouch ... (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005). This family has no subfamilies. Genera Genera within the family Discohelicidae include: * '' Amphitomaria'' * '' Discohelix'' * '' Spiniomphalus'' References {{paleo-gastropod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Snail
Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the absence of a visible Gastropod shell, 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 Neritidae, 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 (gastropod), Truncatella'') are sometimes considered to be sea snails and sometimes listed as land snails. Anatomy Sea snails are a very large and diverse group of animals. 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 w ... [...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 plant variety (botany), varieties), which may be a complex ranking but it is not a species complex. In most cases, a specie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudotorinia
''Pseudotorinia'' is a genus of sea snails, marine gastropod molluscs 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 ''Zootaxa'' is a peer-reviewed scientific mega journal for animal taxonomists. It is published by Magnolia Press (Auckland, New Zealand). The journal was established by Zhi-Qiang Zhang in 2001 and new issues are published multiple times a week ...'' 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 archita ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mollusk
Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The number of additional fossil species is estimated between 60,000 and 100,000, and 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. They are highly diverse, not just in size and anatomical structure, but also in behaviour and habitat, as numerous groups are freshwater and even terrestrial species. 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 extant i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod
Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and from the land. There are many thousands of species of sea snails and sea slug, slugs, as well as freshwater snails, freshwater limpets, land snails and slugs. The class Gastropoda is a diverse and highly successful class of mollusks within the phylum Mollusca. It 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 Furongian, Late Cambrian. , 721 family (taxonomy), families of gastropods are known, of which 245 are extinct and appear only in the fossil record, while 476 are currently neontology, extant living fossil, with or without a fossil record. Gastropoda (previously known as univalves and sometimes spelled "Gasteropoda") are a major part of the phylum Mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marine (ocean)
The ocean is the body of salt water that covers approximately 70.8% of Earth. The ocean is conventionally divided into large bodies of water, which are also referred to as ''oceans'' (the Pacific, Atlantic, Indian, Antarctic/Southern, and Arctic Ocean),"Ocean." ''Merriam-Webster.com Dictionary'', Merriam-Webster, https://www.merriam-webster.com/dictionary/ocean . Accessed March 14, 2021. and are themselves mostly divided into seas, gulfs and subsequent bodies of water. The ocean contains 97% of [...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 types from the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
