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Laevapex
''Laevapex'' is a genus of small, freshwater, air-breathing limpets, aquatic pulmonate gastropod molluscs in the family Planorbidae, the ram's horn snails and their allies. Geographic distribution The genus has a New World distribution. It is widespread throughout the eastern United States, occurring in lakes and slow-flowing rivers. Anatomy These animals have a pallial lung, as do all pulmonate snails, but they also have a false gill or "pseudobranch" which can serve perfectly well as a gill when they are unable to reach the surface for air. Members of this genus are characterised by their smooth apex. Species Species within the genus ''Laevapex'' include: * '' Laevapex diaphanus'' Haldeman, 1841 * ''Laevapex fuscus'' C. B. Adams, 1841 * '' Laevapex peninsulae'' Pilsbry, 1903 * '' Laevapex vazi'' Santos, 1989 Walther (2008) considers North American ''Laevapex'' monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laevapex Peninsulae
''Laevapex'' is a genus of small, freshwater, air-breathing limpets, aquatic pulmonate gastropod molluscs in the family Planorbidae, the ram's horn snails and their allies. Geographic distribution The genus has a New World distribution. It is widespread throughout the eastern United States, occurring in lakes and slow-flowing rivers. Anatomy These animals have a pallial lung, as do all pulmonate snails, but they also have a false gill or "pseudobranch" which can serve perfectly well as a gill when they are unable to reach the surface for air. Members of this genus are characterised by their smooth apex. Species Species within the genus ''Laevapex'' include: * '' Laevapex diaphanus'' Haldeman, 1841 * ''Laevapex fuscus'' C. B. Adams, 1841 * '' Laevapex peninsulae'' Pilsbry, 1903 * '' Laevapex vazi'' Santos, 1989 Walther (2008) considers North American ''Laevapex'' monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laevapex Diaphanus
''Laevapex'' is a genus of small, freshwater, air-breathing limpets, aquatic pulmonate gastropod molluscs in the family Planorbidae, the ram's horn snails and their allies. Geographic distribution The genus has a New World distribution. It is widespread throughout the eastern United States, occurring in lakes and slow-flowing rivers. Anatomy These animals have a pallial lung, as do all pulmonate snails, but they also have a false gill or "pseudobranch" which can serve perfectly well as a gill when they are unable to reach the surface for air. Members of this genus are characterised by their smooth apex. Species Species within the genus ''Laevapex'' include: * '' Laevapex diaphanus'' Haldeman, 1841 * ''Laevapex fuscus'' C. B. Adams, 1841 * ''Laevapex peninsulae'' Pilsbry, 1903 * '' Laevapex vazi'' Santos, 1989 Walther (2008) considers North American ''Laevapex'' monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laevapex Fuscus
''Laevapex fuscus'', the dusky ancylid, is a species of small, freshwater, air-breathing limpet, an aquatic pulmonate gastropod mollusc or micromollusc in the family Planorbidae, the ram's horn snails and their allies. Geographic distribution ''L. fuscus'' is found throughout North America east of the Great Plains, except for mountainous areas. It has been recorded in Canada, the United States, Jamaica and Puerto Rico. Description ''L. fuscus'' was originally described as ''Ancylus fuscus'' in 1841 by Charles Baker Adams: :"''Shell'' thin, transparent without the epidermis, not much elevated, elliptical, moderately curved at the sides; ''epidermis'' brown, visible through the shell, giving it the appearance of having the same color, thick, rough, slightly extending beyond the margin of the shell; ''apex'' obtuse, moderately prominent, scarcely behind the middle, inclining to the right, so as to have only two fifths of the width on that side. :Length, , width, ; height, . ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laevapex Vazi
''Laevapex vazi'' is a species of small, freshwater, air-breathing limpet, an aquatic pulmonate gastropod mollusc or micromollusc in the family Planorbidae, the ram's horn snails and their allies. Etymology The species name honours Dr. Jorge Faria Vaz of the Superintendency of Control of Endemic Diseases (SUCEN) of the state of São Paulo. Taxonomic note At the time of the original species description its characteristic features of a smooth shell apex and an ejaculatory complex without a flagellum fitted better in the description for the genus ''Laevapex''; however, the species is in need of taxonomic revision for the establishment of its true identity, since its shell and musculature do not fit in the characteristics of the genus. Geographic distribution ''L. vazi'' is only known from its type locality, Ourinhos, São Paulo, Brazil. Description ''L. vazi'' has a thin, diaphanous shell, with an oval or elliptical aperture. The apex is rounded, slightly projected and bent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Planorbidae
Planorbidae, common name the ramshorn snails or ram's horn snails, is a family of air-breathing freshwater snails, aquatic pulmonate gastropod molluscs. Unlike most molluscs, the blood of ram's horn snails contains iron-based hemoglobin instead of copper-based hemocyanin. As a result, planorbids are able to breathe oxygen more efficiently than other molluscs. The presence of hemoglobin gives the body a reddish colour. This is especially apparent in albino animals. Being air breathers like other ''Panpulmonata'', planorbids do not have gills, but instead have a lung. The foot and head of planorbids are rather small, while their thread-like tentacles are relatively long. Many of the species in this family have coiled shells that are planispiral, in other words, the shells are more or less coiled flat, rather than having an elevated spire as is the case in most gastropod shells. Although they carry their shell in a way that makes it appear to be dextral, the shell of coiled pl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancylini
Ancylini is a tribe of small, freshwater, air-breathing limpets, aquatic pulmonate gastropod mollusks in the family Planorbidae, the ram's horn snails and their allies. This tribe used to be treated as a family; the current taxonomic placement within Planorbidae is according to the taxonomy of the Gastropoda (Bouchet & Rocroi, 2005). Anatomy These animals have a pallial lung, as do all pulmonate snails, but they also have a false gill or "pseudobranch" which can serve perfectly well as a gill in situations where the limpet is unable to reach the surface for air, as is often the case. Genera Genera in the tribe Ancylini include: * ''Ancylus'' Müller, 1773 - type genus * '' Pseudancylus'' * '' Rhodocephala'' * ''Ferrissia'' Walker, 1903 * '' Rhodacmea'' Walker, 1917 * '' Sineancylus'' Gutiérrez Gregoric, 2014 * '' Anisancylus'' Pilsbry & Vanatta, 1924 * '' Burnupia'' Walker, 1912 * '' Gundlachia'' Pfeiffer, 1849 * '' Hebetancylus'' Pilsbry, 1914 * '' Laevapex'' Walker, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Animal
Animals are multicellular, eukaryotic organisms in the Kingdom (biology), biological kingdom Animalia. With few exceptions, animals Heterotroph, consume organic material, Cellular respiration#Aerobic respiration, breathe oxygen, are Motility, able to move, can Sexual reproduction, reproduce sexually, and go through an ontogenetic stage in which their body consists of a hollow sphere of Cell (biology), cells, the blastula, during Embryogenesis, embryonic development. Over 1.5 million Extant taxon, living animal species have been Species description, described—of which around 1 million are Insecta, insects—but it has been estimated there are over 7 million animal species in total. Animals range in length from to . They have Ecology, complex interactions with each other and their environments, forming intricate food webs. The scientific study of animals is known as zoology. Most living animal species are in Bilateria, a clade whose members have a Symmetry in biology#Bilate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aquatic Animal
An aquatic animal is any animal, whether invertebrate or vertebrate, that lives in water for most or all of its lifetime. Many insects such as mosquitoes, mayflies, dragonflies and caddisflies have aquatic larvae, with winged adults. Aquatic animals may breathe air or extract oxygen from water through specialised organs called gills, or directly through the skin. Natural environments and the animals that live in them can be categorized as aquatic (water) or terrestrial (land). This designation is polyphyletic. Description The term aquatic can be applied to animals that live in either fresh water or salt water. However, the adjective marine is most commonly used for animals that live in saltwater, i.e. in oceans, seas, etc. Aquatic animals (especially freshwater animals) are often of special concern to conservationists because of the fragility of their environments. Aquatic animals are subject to pressure from overfishing, destructive fishing, marine pollution, hunting, and cli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apex (mollusc)
In anatomy, an apex (adjectival form: apical) is part of the shell of a mollusk. The apex is the pointed tip (the oldest part) of the shell of a gastropod, scaphopod, or cephalopod. The apex is used in end-blown conches. Gastropods The word "apex" is most often used to mean the tip of the spire of the shell of a gastropod. The apex is the first-formed, and therefore the oldest, part of the shell. To be more precise, the apex would usually be where the tip of the embryonic shell or protoconch is situated, if that is still present in the adult shell (often it is lost or eroded away). Coiled gastropod shells The phrase apical whorls, or protoconch, means the whorls that constitute the embryonic shell at the apex of the shell, especially when this is clearly distinguishable from the later whorls of the shell, otherwise known as the teleoconch. Comparison of the apical part and the whole shell of ''Otukaia kiheiziebisu'': File:Calliostoma kiheiziebisu apex.png File:Calliostoma k ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gill
A gill () is a respiratory organ that many aquatic organisms use to extract dissolved oxygen from water and to excrete carbon dioxide. The gills of some species, such as hermit crabs, have adapted to allow respiration on land provided they are kept moist. The microscopic structure of a gill presents a large surface area to the external environment. Branchia (pl. branchiae) is the zoologists' name for gills (from Ancient Greek ). With the exception of some aquatic insects, the filaments and lamellae (folds) contain blood or coelomic fluid, from which gases are exchanged through the thin walls. The blood carries oxygen to other parts of the body. Carbon dioxide passes from the blood through the thin gill tissue into the water. Gills or gill-like organs, located in different parts of the body, are found in various groups of aquatic animals, including mollusks, crustaceans, insects, fish, and amphibians. Semiterrestrial marine animals such as crabs and mudskippers have gill cham ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudobranch
The pseudobranch, also pseudobranchia is the reduced first gill arch of a fish (on the inner surface of the opercle, near the junction of the preopercle) as well as a reduced "false" gill in some gastropods. In teleost fish, the pseudobranchs are mostly without respiratory function, and in elasmobranch Elasmobranchii () is a subclass of Chondrichthyes or cartilaginous fish, including sharks (superorder Selachii), rays, skates, and sawfish (superorder Batoidea). Members of this subclass are characterised by having five to seven pairs of g ...s they are the gill arch of the spiracle. The function of the pseudobranch is unknown, but it is believed that it supplies highly oxygenated blood to the optic choroid and retina and may have baroreceptor (pressure) and thermoregulation functions. It may also be a site of oxygen chemoreception. External links Picture of trout pseudobranchPseudobranch description incl. picture References Fish anatomy {{vertebrate-anatomy-s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New World
The term ''New World'' is often used to mean the majority of Earth's Western Hemisphere, specifically the Americas."America." ''The Oxford Companion to the English Language'' (). McArthur, Tom, ed., 1992. New York: Oxford University Press, p. 33: "[16c: from the feminine of ''Americus'', the Latinized first name of the explorer Amerigo Vespucci (1454–1512). The name ''America'' first appeared on a map in 1507 by the German cartographer Martin Waldseemüller, referring to the area now called Brazil]. Since the 16c, a name of the western hemisphere, often in the plural ''Americas'' and more or less synonymous with ''the New World''. Since the 18c, a name of the United States of America. The second sense is now primary in English: ... However, the term is open to uncertainties: ..." The term gained prominence in the early 16th century, during Europe's Age of Discovery, shortly after the Italian explorer Amerigo Vespucci concluded that America (now often called ''the Am ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
