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Onustus
''Onustus'' is a genus of large sea snails, marine gastropod mollusks in the family Xenophoridae, the carrier shells. Description Shells medium-sized to large (diameter of base without attachments 80–160 mm; height of shell 42–100 mm), thin-shelled, with wide peripheral flange, simple or weakly digitate, porcellanous ventrally. Umbilicus narrow to wide, sometimes plugged with callus. Foreign objects attached to periphery on few to all whorls, usually small and inconspicuous, leaving most of the shell surface exposed.Kreipl, K. & Alf, A. (1999): ''Recent Xenophoridae''. 148 pp. incl. 28 color plts. ConchBooks, Hackenheim, . Species Species within the genus ''Onustus'' include: *''Onustus caribaeus'' ( Petit de la Saussaye, 1857) *''Onustus exutus'' (Reeve, 1842) *''Onustus indicus'' ( Gmelin, 1791) *''Onustus longleyi'' Bartsch Bartsch is a German surname. Notable people with the surname include: * Adam Bartsch (1757–1821), German scholar of old master pri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Onustus Caribaeus
''Onustus caribaeus'' is a species of large sea snail, a marine gastropod mollusk in the family Xenophoridae, the carrier shells. Description The anatomy of O. Caribaeus. is very similar to all members of the Xenophoridae family. Their shells have a flat bottom and a short conical spiral on top. They are known for their ability to camouflage by attaching substrates like pebbles, sand, empty shells, and even coral to the top of their shells. The specifics of how this is done are not known. However, we know that these foreign objects are fused to the shells in all different conformations, radially, laterally, or symmetrically as the shell grows. The shells can reach a maximum height of 45 mm, in average 37 mm. The diameter of the base reaches a maximum length of 88 mm, in average 60 mm. The colour of the dorsum is yellowish-white.Kreipl, K. & Alf, A. (1999): ''Recent Xenophoridae''. 148 pp. incl. 28 color plts. ConchBooks, Hackenheim, . Like other snails, O. Cari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Onustus Longleyi
''Onustus longleyi'' is a species of large sea snail, a marine gastropod mollusk in the family Xenophoridae, the carrier shells. Description These sea snails are usually a white-cream color, with a cream underside. Their spire is rather smooth, and the lower edge of the shell is quite irregular and jagged. The umbilicus is straight and open to the apex. Small bits of their shells are cemented at the suture. Most of these gastropods have a calcareous external shell. Others lack a shell completely, or have reduced internal shells. These snails are known for their tendency to pick up other shells, skeletal fragments, rocks, or corals (sometimes still alive) from their surrounding environment and cement these objects to their own shells. The result looks like a pile of shells on the seafloor. Often, sponges and serpulid worm tubes are found encrusting the xenophorid shell - as they contribute to the illusion that a xenophorid is simply a patch of the seafloor. Xenophora carrier sna ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Onustus Exutus
''Onustus exutus'' is a species of large sea snail, a marine gastropod mollusk in the family Xenophoridae, the carrier shells. Description Distribution ''Onustus exustus'' is distributed in the Central Indo-Pacific from southern Japan to southern Indonesia, tropical Western Australia, northern Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ... and Papua. It can be found between 18 and 340 m.Kreipl, K. & Alf, A. (1999): ''Recent Xenophoridae''. 148 pp. incl. 28 color plts. ConchBooks, Hackenheim, . References External links * Xenophoridae Gastropods described in 1842 {{Xenophoridae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Onustus Indicus
''Onustus indicus'' is a species of large sea snail, a marine gastropod mollusk in the family Xenophoridae, the carrier shells. Description Distribution ''Onustus indicus'' is distributed in the tropical Indian Ocean (excluding Arabian Sea), the central Indo-Pacific and the westernmost Pacific (Hong Kong to southern Indonesia) as well as in northern tropical The tropics are the regions of Earth surrounding the Equator. They are defined in latitude by the Tropic of Cancer in the Northern Hemisphere at N and the Tropic of Capricorn in the Southern Hemisphere at S. The tropics are also referred to ...- subtropical eastern and western Australia. It can be found between 4 and 150 m.Kreipl, K. & Alf, A. (1999): ''Recent Xenophoridae''. 148 pp. incl. 28 color plts. ConchBooks, Hackenheim, . References External links * Xenophoridae Gastropods described in 1791 Taxa named by Johann Friedrich Gmelin {{Xenophoridae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xenophoridae
Xenophoridae, common name, commonly called carrier shells, is a family (biology), family of medium-sized to large sea snails, marine (ocean), marine gastropod mollusks in the clade Littorinimorpha. According to the Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005), taxonomy of the Gastropoda by Bouchet & Rocroi (2005) the family Xenophoridae has no subfamilies. Distribution The Xenophorids live on sand and mud bottoms of the continental shelf, continental shelves and the continental margin, continental slopes of the subtropical and tropical seas and range from very shallow water to depths of more than 1,400 meters.Kreipl, K. & Alf, A. (1999): ''Recent Xenophoridae''. 148 pp. incl. 28 color plts. ConchBooks, Hackenheim, . Shell description Xenophorids are unusual in that in many of the species the animal cements small stones or shells to the edge of the gastropod shell, shell as it grows, thus the shells of those species are sometimes humorously referred to as "shell-collectin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Family (biology)
Family ( la, familia, plural ') is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between order and genus. A family may be divided into subfamilies, which are intermediate ranks between the ranks of family and genus. The official family names are Latin in origin; however, popular names are often used: for example, walnut trees and hickory trees belong to the family Juglandaceae, but that family is commonly referred to as the "walnut family". What belongs to a family—or if a described family should be recognized at all—are proposed and determined by practicing taxonomists. There are no hard rules for describing or recognizing a family, but in plants, they can be characterized on the basis of both vegetative and reproductive features of plant species. Taxonomists often take different positions about descriptions, and there may be no broad consensus across the scientific community for some time. The publishing of new data and opi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Johann Friedrich Gmelin
Johann Friedrich Gmelin (8 August 1748 – 1 November 1804) was a German natural history, naturalist, botanist, entomologist, herpetologist, and malacologist. Education Johann Friedrich Gmelin was born as the eldest son of Philipp Friedrich Gmelin in 1748 in Tübingen. He studied medicine under his father at University of Tübingen and graduated with a Master's degree in 1768, with a thesis entitled: ', defended under the presidency of Ferdinand Christoph Oetinger, whom he thanks with the words '. Career In 1769, Gmelin became an adjunct professor of medicine at University of Tübingen. In 1773, he became professor of philosophy and adjunct professor of medicine at University of Göttingen. He was promoted to full professor of medicine and professor of chemistry, botany, and mineralogy in 1778. He died in 1804 in Göttingen. Johann Friedrich Gmelin when young became an "apostle" of Carl Linnaeus, probably when Linnaeus was working in the Netherlands, and undertook a plant-c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lovell Augustus Reeve
Lovell Augustus Reeve (19 April 1814 – 18 November 1865) was an English conchologist and publisher. Life Born at Ludgate Hill, London, on 19 April 1814, he was a son of Thomas Reeve, draper and mercer, by his wife Fanny Lovell. After attending school at Stockwell, he was apprenticed at the age of 13 to Mr. Graham, a local grocer. The chance of purchase of some shells led to a lifelong interest in conchology. In 1833 he attended the meeting of the British Association for the Advancement of Science at Cambridge. At the end of his apprenticeship Reeve paid a visit to Paris, where he read a paper on the classification of Mollusca before the Academy of Sciences. On his return to London, he set to work on his first book, ''Conchologia Systematica'' (2 vols. London, 1841–2). From 1842, he traded as a natural history dealer. Using profits made by the sale of Dutch Governor-General of the Moluccas Van Ryder's collection from the Moluccas, which he purchased at Rotterdam, and with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sauveur Abel Aubert Petit De La Saussaye
Sauveur Abel Aubert Petit de la Saussaye (1792–1870)Coan E. V. & Kabat A. R. (2017). ''2,400 years of malacology, 14th ed.'', 1,443 pp. + 110 pp. nnex 1 – Book Collations+ 65 pp. nnex 2 – Küster Collation 51 pp. nnex 3 – Journal Collations. American Malacological Society: http://www.malacological.org/2004_malacology.html was a malacologist from France. His surname is: Petit de la Saussaye. From 1850 to 1853 he was editor of the ''Journal de Conchyliologie''. He was the author of the following: * ''Notice à l'usage des personnes qui s'occupent de la recherche des coquilles'', 1838 – Instructions of usage for persons involved in the search for shells. * ''Catalogue des mollusques testacés des mers d'Europe'', 1869 – Catalog of shelled mollusks 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 numbe ... [...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 whorl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Umbilicus (mollusc)
The umbilicus of a shell is the axially aligned, hollow cone-shaped space within the whorls of a coiled mollusc shell. The term umbilicus is often used in descriptions of gastropod shells, i.e. it is a feature present on the ventral (or under) side of many (but not all) snail shells, including some species of sea snails, land snails, and freshwater snails. The word is also applied to the depressed central area on the planispiral coiled shells of ''Nautilus'' species and fossil ammonites. (These are not gastropods, but shelled cephalopods.) In gastropods The spirally coiled whorls of gastropod shells frequently connect to each other by their inner sides, during the natural course of its formation. This results in a more or less solid central axial pillar, known as the columella. The more intimate the contact between the concave side of the whorls is, the more solid the columella becomes. On the other hand, if this connection is less intense, a hollow space inside the whorls ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastropod Shell
The gastropod shell is part of the body of a Gastropoda, gastropod or snail, a kind of mollusc. The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage. Some gastropods appear shell-less (slugs) but may have a remnant within the mantle, or in some cases the shell is reduced such that the body cannot be retracted within it (semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the Aperture (mollusc), aperture, which provides further protection. The study of mollusc shells is known as conchology. The biological study of gastropods, and other molluscs in general, is malacology. Shell morphology terms vary by species group. Shell layers The gastropod shell has three major layers secreted by the Mantle (mollusc), mantle. The calcareous central layer, tracum, is typically made of calcium carbonate precipitated into an organic matrix known as c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
