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Varix (mollusc)
A varix () is an anatomical feature of the shell of certain sea snails, marine gastropod molluscs. Gastropods whose shells have varices are primarily families and species within the taxonomic groups Littorinimorpha and Neogastropoda. The varix is a thickened axial ridge, a subcylindrical protrusion, in the shell which exists in some families of marine gastropods. It is an important shell character in generic classification. A varix is located at intervals around the whorl, and is formed by considerable thickening of the outer lip during a resting stage in the growth of the shell. In other words, in gastropods whose shells have varices, the shells are characterised by episodic growth - the shell grows in spurts, and during the resting phase the varix forms. In many gastropod whose shells have varices, for example the Cassinae, the varix is essentially merely a thickening and swelling of the shell at that point. But in some genera within the family Muricidae, such as ''Chicoreu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semicassis Granulata Apertural
''Semicassis'' is a genus of medium-sized predatory sea snails, marine gastropod molluscs in the subfamily Cassinae within the family Cassidae, the helmet snails and bonnet snails. Species According to the World Register of Marine Species (WoRMS), the following species with valid names are included within the genus ''Semicassis'': *'' Semicassis adcocki'' (Sowerby III, 1896) *'' Semicassis angasi'' (Iredale, 1927) *'' Semicassis bisulcata'' (Schubert & Wagner, 1829) *'' Semicassis bondarevi'' Mühlhäusser & Parth, 1993 *'' Semicassis bulla'' Habe, 1961 *'' Semicassis canaliculata'' (Bruguière, 1792) * '' Semicassis cancellata'' (Lamarck, 1803) *'' Semicassis centiquadrata'' (Valenciennes, 1832) *'' Semicassis craticulata'' (Euthyme, 1885) * '' Semicassis decipiens'' (Kilburn, 1980) * '' Semicassis dorae'' (Kreipl & Mühlhäusser, 1996) * '' Semicassis dougthorni'' Dekkers, 2013 *'' Semicassis faurotis'' (Jousseaume, 1888) * '' Semicassis fernandesi'' (Kilburn, 1975) * † ' ... [...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] |
Murex
''Murex'' is a genus of medium to large sized predatory tropical sea snails. These are carnivorous marine gastropod molluscs in the family Muricidae, commonly called "murexes" or "rock snails".Houart, R.; Gofas, S. (2010). Murex Linnaeus, 1758. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138196 on 2011-04-09 The common name murex is still used for many species in the family Muricidae which were originally given the Latin generic name ''Murex'' in the past, but have more recently been regrouped into different newer genera. The word ''murex'' was used by Aristotle in reference to these kinds of snails, thus making it one of the oldest classical seashell names still in use by the scientific community. Fossil records This genus is known in the fossil records from the Cretaceous to the Quaternary (age range: from 125.45 to 0.0 million ye ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ranellidae
The Ranellidae, common name the triton shells or tritons, are a taxonomic family of small to very large predatory sea snails, marine gastropod mollusks in the order Littorinimorpha. Subfamilies According to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005, the family Ranellidae consisted of two subfamilies: *Ranellinae Gray, 1854 - synonyms: Agrobuccininae Kilias, 1973; Simpulidae Dautzenberg, 1900; Gyrineinae Higo & Goto, 1993 (n.a.) *Cymatiinae Iredale, 1913 (1854) - synonyms: Tritoniidae H. Adams & A. Adams, 1853 (inv.); Neptunellinae Gray, 1854; Lampusiidae Newton, 1891; Lotoriidae Harris, 1897; Septidae Dall & Simpson, 1901; Aquillidae Pilsbry, 1904; Nyctilochidae Dall, 1912; Charoniinae Powell, 1933 The Cymatiinae now form a separate family: Cymatiidae. Genera The family Ranellidae contains the following genera: * ''Haurokoa'' C. A. Fleming, 1955 † * ''Obscuranella'' Kantor & Harasewych, 2000 * ''Priene'' H. Adams & A. Adams, 1858 * ''Ranella ''Ranella'' is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pterynotus
''Pterynotus'' is a genus of sea snails, marine gastropod mollusks in the subfamily Muricinae of the family Muricidae Muricidae is a large and varied taxonomic family of small to large predatory sea snails, marine gastropod mollusks, commonly known as murex snails or rock snails. With about 1,600 living species, the Muricidae represent almost 10% of the Neoga ..., the murex snails or rock snails. Species Species within the genus ''Pterynotus'' include: * '' Pterynotus alatus'' (Röding, 1798) * '' Pterynotus albobrunneus'' Bertsch & D'Attilio, 1980 * '' Pterynotus aparrii'' D'Attilio & Bertsch, 1980 * '' Pterynotus barclayanus'' (H. Adams, 1873) * '' Pterynotus bibbeyi'' (Radwin & D'Attilio, 1976) * '' Pterynotus bipinnatus'' (Reeve, 1845) * '' Pterynotus bouteti'' Houart, 1990 * '' Pterynotus elaticus'' (Houart, 2000) * '' Pterynotus elongatus'' (Lightfoot, 1786) * '' Pterynotus laurae'' Houart, 1997 * '' Pterynotus martinetana'' (Röding, 1798) * '' Pterynotus patagia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pteropurpura
''Pteropurpura'' is a genus of sea snails, marine gastropod mollusks in the subfamily Ocenebrinae of the family Muricidae, the murex snails or rock snails. Species Species within the genus ''Pteropurpura'' include: * '' Pteropurpura benderskyi'' Emerson & D'Attilio, 1979 * '' Pteropurpura bequaerti'' Clench & Farfante, 1945 * '' Pteropurpura centrifuga'' (Hinds, 1844) * '' Pteropurpura dearmata'' (Odhner, 1922) * '' Pteropurpura deroyana'' Berry, 1968 * '' Pteropurpura erinaceoides'' (Valenciennes, 1832) * '' Pteropurpura esycha'' (Dall, 1925) * ''Pteropurpura fairiana'' (Houart, 1979) * '' Pteropurpura festiva'' (Hinds, 1844) * '' Pteropurpura macroptera'' (Deshayes, 1839) * '' Pteropurpura modesta'' (Fulton, 1936) * '' Pteropurpura plorator'' (Adams & Reeve, 1845) * '' Pteropurpura sanctaehelenae'' (E.A. Smith, 1891) * '' Pteropurpura stimpsoni'' (A. Adams, 1863) * '' Pteropurpura trialata'' (Sowerby, 1834) * '' Pteropurpura vokesae'' Emerson, 1964 ; Species brought into syno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hexaplex
''Hexaplex'' is a genus of medium-sized to large sea snails, marine gastropod mollusks in the subfamily muracinae of the family Muricidae, the murex shells or rock snails.Houart, R.; Gofas, S. (2010). Hexaplex Perry, 1810. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138194 on 2010-11-01 This genus is known in the fossil record from the Paleocene to the Quaternary period (age range: from 61.7 to 0.012 million years ago.). Fossil shells within this genus have been found all over the world. Description This genus includes shells in the family Muricidae that are solid and globose. They contain five to eight varices that are more or less foliaceous. Species Species within the genus ''Hexaplex'' include : * '' Hexaplex angularis'' (Lamarck, 1822) * †''Hexaplex arietinus'' (Millet, 1865) * '' Hexaplex bifasciatus'' (A. Adams, 1853) * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chicoreus
''Chicoreus'' is a genus of medium- to large-sized predatory sea snails. These are carnivorous marine gastropod molluscs in the family Muricidae, the murexes or rock snails.Bouchet, P.; Houart, R. (2010). Chicoreus Montfort, 1810. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=205487 on 2010-11-01 Species Over 100 species are within the genus, with several subgeneraref name="Malacolog 4.1.1"> including: *'' Chicoreus aculeatus'' (Lamarck, 1822) * '' Chicoreus akritos'' Radwin & D'Attilio, 1976 *'' Chicoreus allaryi'' Houart, Quiquandon & Briano, 2004 * '' Chicoreus androyensis'' Damarco & Briano, 2020 * '' Chicoreus anosyensis'' Bozzetti, 2013 * '' Chicoreus aquilus'' Houart, Moe & C. Chen, 2017 * '' Chicoreus arbaguil'' Houart, 2015 *'' Chicoreus asianus'' Kuroda, 1942 *'' Chicoreus austramosus'' Vokes, 1978 *'' Chicoreus axicornis' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Muricidae
Muricidae is a large and varied taxonomic family of small to large predatory sea snails, marine gastropod mollusks, commonly known as murex snails or rock snails. With about 1,600 living species, the Muricidae represent almost 10% of the Neogastropoda. Additionally, 1,200 fossil species have been recognized.Merle, D., Garrigues, B. & Pointier, J.-P. (2011). ''Fossil and Recent Muricidae of the World, Part Muricinae''. 648 pp., 182 colour plates, ConchBooks, Hackenheim. . Numerous subfamilies are recognized, although experts disagree about the subfamily divisions and the definitions of the genera. Many muricids have unusual shells which are considered attractive by shell collectors and by interior designers. Shell description Muricid shells are variably shaped, generally with a raised spire and strong sculpture with spiral ridges and often axial varices (typically three or more varices on each whorl), also frequently bearing spines, tubercles, or blade-like processes. Periostrac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cassinae
The Cassidae are a taxonomic family of medium-sized, large, and sometimes very large sea snails commonly called helmet snails or bonnet snails. These are marine gastropod mollusks in the superfamily Tonnoidea and the clade Littorinimorpha.Gofas, S. (2010). Cassidae. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=22999 on 2011-01-19 About 60 species comprise the family Cassidae; an example is '' Cypraecassis rufa''. Nomenclature Despite its incorrect formation (the correct one would be Cassididae, based on the genitive form of Cassis), the ICZN has placed the name Cassidae Latreille, 1825 on the official list of family names, therefore avoiding homonymy with Cassididae Stephens, 1831 (based on Cassida Linnaeus, 1758, a chrysomelid beetle); Opinion 1023 (1974, Bulletin of Zoological Nomenclature 31: 127-129). Distribution Species of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Episodic Growth
Episodic may refer to: * The nature of television series that are divided into short programs known as episodes * Episodic memory, types of memory that result from specific incidents in a lifetime * In Geology, episodic refers to events that occur or have occurred periodically * Episodic writing, a publishing format by which a single large work is presented in contiguous (typically chronological) installments * Episodic video game An episodic video game is a video game of a shorter length that is commercially released as an installment to a continuous and larger series. Episodic games differ from conventional video games in that they often contain less content but are develo ..., a video game of a shorter length that is commercially released as an installment See also * {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal Shell
An exoskeleton (from Greek ''éxō'' "outer" and ''skeletós'' "skeleton") is an external skeleton that supports and protects an animal's body, in contrast to an internal skeleton (endoskeleton) in for example, a human. In usage, some of the larger kinds of exoskeletons are known as " shells". Examples of exoskeletons within animals include the arthropod exoskeleton shared by chelicerates, myriapods, crustaceans, and insects, as well as the shell of certain sponges and the mollusc shell shared by snails, clams, tusk shells, chitons and nautilus. Some animals, such as the turtle, have both an endoskeleton and an exoskeleton. Role Exoskeletons contain rigid and resistant components that fulfill a set of functional roles in many animals including protection, excretion, sensing, support, feeding and acting as a barrier against desiccation in terrestrial organisms. Exoskeletons have a role in defense from pests and predators, support and in providing an attachment framework for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
