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Varix (mollusc)
A varix (: varices) is an anatomical feature of the gastropod shell, shell of certain sea snails, marine (ocean), marine gastropod molluscs. Gastropods whose shells have varices are primarily families and species within the Taxonomy (biology), taxonomic groups Littorinimorpha and Neogastropoda. The varix is a thickened axial ridge, a subcylindrical protrusion, in the Exoskeleton, 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 (mollusc), 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semicassis Granulata Apertural
''Semicassis'' is a genus of medium-sized predatory sea snails, marine (ocean), marine gastropod molluscs in the subfamily Cassinae within the family (biology), 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whorl (mollusc)
A whorl is a single, complete 360° revolution or turn in the spiral or whorled 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 Cone (geometry), conical tube, the growth of which is coiled into an overall Helix, 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 s ... [...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,'' but have more recently been regrouped into newer genera. ''Murex'' was used in antiquity to describe spiny sea snails, especially those associated with the production of purple dye''. Murex'' is one of the oldest classical seashell names still used by the scientific community. Aristotle described these mollusks in his ''History of Animals'' using the Greek term πορφύρα (''porphyra'' ... [...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. Distribution The Tritons are principally equatorial in their geographical distribution, and belong more especially to the Asiatic fauna. Those with the siphonal canal very much produced are obtained from deep water. The cancellated forms are from sand, in deep water; and those covered with an epidermis are chiefly from sandy mud, in from six to thirty fathoms. 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 D ... [...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, the murex snails or rock snails. Species The following species are recognised in the genus ''Pterynotus'': * '' 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 denudatus'' (Deshayes, 1835) * '' Pterynotus elaticus'' (Houart, 2000) * '' Pterynotus elongatus'' (Lightfoot, 1786) * †'' Pterynotus fusoides'' (Deshayes, 1865) * '' Pterynotus laurae'' Houart, 1997 * '' Pterynotus martinetana'' (Röding, 1798) * '' Pterynotus patagiatus'' (Hedley, 1912) * '' Pterynotus pellucidus'' (Reeve, 1845) * †'' Pterynotus pseuderinaceus'' (Boettger, 1902) * †'' Pterynotus rembange ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pteropurpura
''Pteropurpura'', common name the stag shells, is a genus of sea snails, marine gastropod mollusks in the subfamily Ocenebrinae 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 over 1,700 living species, the Muricidae represent almost 10% of the Neog ..., 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 friedbergi'' (Cossmann & Peyrot, 1924) * '' Pteropu ... [...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 Muricinae 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'' (Lam ... [...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 over 1,700 living species, the Muricidae represent almost 10% of the Neogastropoda. Additionally, 1,200 fossil species have been recognized.Houart, Roland. (2018). "Historique et classification des espèces actuelles de Muricidae (Neogastropoda, Muricoidea)." ''Novapex'' 19:37–66 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. Periostracum is absent in thi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cassinae
The Cassidae are a Taxonomy (biology), taxonomic family (biology), family of medium-sized, large, and sometimes very large sea snails commonly called helmet snails or bonnet snails. These are marine (ocean), 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 Nomenc ... [...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 * 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 devel ..., 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] |
Exoskeleton
An exoskeleton () . is a skeleton that is on the exterior of an animal in the form of hardened integument, which both supports the body's shape and protects the internal organs, in contrast to an internal endoskeleton (e.g. human skeleton, that of a human) which is enclosed underneath other soft tissues. Some large, hard and non-flexible protective exoskeletons are known as mollusc shell, shell or armour (anatomy), armour. Examples of exoskeletons in animals include the arthropod exoskeleton, cuticle skeletons shared by arthropods (insects, chelicerates, myriapods and crustaceans) and tardigrades, as well as the corallite, skeletal cups formed by hardened secretion of stony corals, the test (biology), test/tunic of sea squirts and sea urchins, and the prominent mollusc shell shared by snails, bivalvia, clams, tusk shells, chitons and nautilus. Some vertebrate animals, such as the turtle, have both an endoskeleton and a turtle shell, protective exoskeleton. Role Exoskeletons c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
