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Assimineidae
Assimineidae is a family (biology), family of small snails, also known as palmleaf snails, with an Operculum (gastropod), operculum, gastropod mollusks or micromollusks in the superfamily Truncatelloidea. Many of these very small snails live in intermediate habitats, being amphibious between saltwater and land; others live in freshwater. Distribution The distribution of the Assimineidae is worldwide."Family summary for Assimineidae" AnimalBase, last change 15-08-2006, accessed 4 August 2010. The oldest fossils are known from the Cenomanian aged Burmese amber. Ecology Various species in this family occur in estuarine habitats, in salt marshes and in freshwater. Some are terrestrial or :wikt:amphibious, amphibious.Description The gast ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aviassiminea
''Aviassiminea'' is a genus of minute operculate snails, marine (ocean), marine gastropod mollusks or micromollusks in the family (biology), family Assimineidae. Species Species within ''Aviassiminea'' include: * ''Aviassiminea palitans'' Fukuda & Ponder, 2003 References External links Fukuda H. & Ponder W.F. 2003. ''Australian freshwater assimineids, with a synopsis of the Recent genus-group taxa of the Assimineidae (Mollusca: Caenogastropoda: Rissooidea).'' Journal of Natural History, 37: 1977-2032] Assimineidae Monotypic gastropod genera {{Assimineidae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Assiminea Grayana
''Assiminea grayana'', common name the "dun sentinel", is a species of very small (4–6 mm.) salt marsh snail, a terrestrial (or marine gastropod mollusk in the family Assimineidae. Habitat This species lives in habitats that are intermediate between land and saltwater: in estuaries and salt marshes, at, or right above, the high tide level. Description The 5 mm high x 3 mm. wide shell is semi-transparent and conical, with six or seven flat-sided or slightly swollen whorls and a sharp apex. It bears fine irregular growth lines and faint spiral lines but appears smooth . The oval or ear-shaped aperture is small and has a thickened peristome. The inner lip is reflexed over the base of the last whorl. There is no umbilicus. The colour is horn or tan, often with a broad reddish band on the last whorl. Distribution This small snail lives in Western Europe, primarily on the southern part of the North Sea coasts, in countries and islands including: * Great Britain * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angustassiminea
''Angustassiminea'' is a genus of gastropods belonging to the family Assimineidae Assimineidae is a family (biology), family of small snails, also known as palmleaf snails, with an Operculum (gastropod), operculum, gastropod mollusks or micromollusks in the superfamily Truncatelloidea. Many of these very small snails live in i .... Species The species of this genus are found in Japan and Northern America. The following species are recognised in the genus ''Angustassiminea'': *'' Angustassiminea andrewsiana'' *'' Angustassiminea californica'' (synonym: ''Assiminea californica'' (Tryon, 1865)) *'' Angustassiminea castanea'' *'' Angustassiminea infima'' *'' Angustassiminea kyushuensis'' *'' Angustassiminea lucida'' *'' Angustassiminea nitida'' *'' Angustassiminea satumana'' *'' Angustassiminea succinea'' *'' Angustassiminea vulgaris'' ;Species brought into synonymy: * ''Angustassiminea yoshidayukioi'' (Kuroda, 1959): synonym of '' Assiminea yoshidayukioi'' Kuroda, 1959 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Assiminea
''Assiminea'' is a genus of minute, salt-tolerant snails with an operculum, aquatic gastropod mollusks, or micromollusks, in the family Assimineidae.Bouchet, P.; Gofas, S. (2015). Assiminea Fleming, 1828. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=137681 on 29 April 2015 Distribution and habitat These snails can be found worldwide. They live usually in brackish water and salt marshes of tropical and temperate regions, at beaches, in water and at land. Description These are very small to medium large snails, between 2 and 13 mm). Some adults do not exceed a size of 3 mm. The shape of the thin shells is somewhat ovately conical. The margin of the aperture is simple. The operculum is in most cases horny. The eyes are at the end of short, stout stalks. They feed on vegetable detritus and small algae. They lay their eggs in the mud, and hatch as free-swimming larvae. Species According to the World Registe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taxonomy Of The Gastropoda (Bouchet & Rocroi, 2005)
The taxonomy of the Gastropoda as it was revised in 2005 by Philippe Bouchet and Jean-Pierre Rocroi is a system for the scientific classification of gastropod mollusks (Gastropods are a taxonomic class of animals which consists of snails and slugs of every kind, from the land, from freshwater, and from saltwater). The paper setting out this taxonomy was published in the journal '' Malacologia''. The system encompasses both living and extinct groups, as well as some fossils whose classification as gastropods is uncertain. The Bouchet & Rocroi system was the first complete gastropod taxonomy that primarily employed the concept of clades, and was derived from research on molecular phylogenetics; in this context a clade is a "natural grouping" of organisms based upon a statistical cluster analysis. In contrast, most of the previous overall taxonomic schemes for gastropods relied on morphological features to classify these animals, and used taxon ranks such as order, superorder ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micromollusk
A micromollusc is a shelled mollusc which is extremely small, even at full adult size. The word is usually, but not exclusively, applied to marine molluscs, although in addition, numerous species of land snails and freshwater molluscs also reach adult size at very small dimensions. These tiny molluscs or their tiny shells are easy to overlook, as many of them are not very noticeable to the naked eye, and thus many people are not aware that they even exist. Nonetheless there are large numbers of families and vast numbers of mollusc species, in particular marine gastropods or sea snails, which are minute enough to be considered micromolluscs. Considerable numbers of marine gastropod species are only about 5 or 6 mm in adult size; many others are only about 2 or 3 mm in adult size; and a few have adult shells which are as small as one millimeter or even smaller still. Micromolluscs are known to have adult shells as small as 600 μm.Geiger et al 2007, Pg. 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Subfamily
In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end botanical subfamily names with "-oideae", and zoological subfamily names with "-inae". Detarioideae is an example of a botanical subfamily. Detarioideae is a subdivision of the family Fabaceae (legumes), containing 84 genera. Stevardiinae is an example of a zoological subfamily. Stevardiinae is a large subdivision of the family Characidae, a diverse clade In biology, a clade (), also known as a Monophyly, monophyletic group or natural group, is a group of organisms that is composed of a common ancestor and all of its descendants. Clades are the fundamental unit of cladistics, a modern approach t ... of freshwater fish. See also * International Code of Nomenclature for algae, fungi, and plants * International Code of Zoological Nomenclature * Rank (botany) * Rank (zoolo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ctenidium (mollusc)
A ctenidium is a respiratory organ or gill which is found in many molluscs. This structure exists in bivalves, cephalopods, polyplacophorans (chitons), and in aquatic gastropods such as freshwater snails and marine snails. Certain molluscs, such as the bivalves, possess paired ctenidia, but others, such as members of the Ampullariidae, bear a single ctenidium. A ctenidium is shaped like a comb or a feather, with a central part from which many filaments or plate-like structures protrude, lined up in a row. Some aquatic gastropods possess a single row of filaments on their ctenidium, known as the monopectinate condition, and others have a pair of filament rows, known as the bipectinate or aspidobranch condition. The ctenidium hangs into the mantle cavity and increases the area available for gas exchange. The apple ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Snout
A snout is the protruding portion of an animal's face, consisting of its nose, mouth, and jaw. In many animals, the structure is called a muzzle, Rostrum (anatomy), rostrum, beak or proboscis. The wet furless surface around the nostrils of the nose of many mammals is called the rhinarium (colloquially this is the "cold wet snout" of some mammals). The rhinarium is often associated with a stronger sense of olfaction. Variation Snouts are found on many mammals in a variety of shapes. Some animals, including ursines and great cats, have box-like snouts, while others, like shrews, have pointed snouts. Pig snouts are flat and cylindrical. Primates Strepsirrhine primates have muzzles, as do baboons. Great apes have reduced muzzles, with the exception being human beings, whose face does not have protruding jaws nor a snout but merely a human nose. Dogs The muzzle begins at the Stop (dog), stop, just below the eyes, and includes the dog's nose and mouth. In the domestic dog, most of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tentacles
In zoology, a tentacle is a flexible, mobile, and elongated organ present in some species of animals, most of them invertebrates. In animal anatomy, tentacles usually occur in one or more pairs. Anatomically, the tentacles of animals work mainly like muscular hydrostats. Most forms of tentacles are used for grasping and feeding. Many are sensory organs, variously receptive to touch, vision, or to the smell or taste of particular foods or threats. Examples of such tentacles are the eyestalks of various kinds of snails. Some kinds of tentacles have both sensory and manipulatory functions. A tentacle is similar to a cirrus, but a cirrus is an organ that usually lacks the tentacle's strength, size, flexibility, or sensitivity. A nautilus has cirri, but a squid has tentacles. Invertebrates Molluscs Many molluscs have tentacles of one form or another. The most familiar are those of the pulmonate land snails, which usually have two sets of tentacles on the head: when exte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
