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Chaetonotida
The Chaetonotida is an order of gastrotrichs. They generally have a tenpin or bottle-like shape. Chaetonotids inhabit both freshwater and marine environments. They can be distinguished from other gastrotrichs by the absence of pores in the pharynx, and by the presence of adhesive glands at the posterior end of the animal only. Most freshwater species are parthenogenetic Parthenogenesis (; from the Greek grc, παρθένος, translit=parthénos, lit=virgin, label=none + grc, γένεσις, translit=génesis, lit=creation, label=none) is a natural form of asexual reproduction in which growth and development .... The smooth or complex cuticle has a variable number of adhesive tubes, and the pharyngeal lumen of Chaetonotids is Y-shaped. A valve may be present at the junction of the pharynx and midgut. The epidermis in most organisms in this order is partly syncytial. The Chaetonotids are divided into two suborders, Multitubulatina and Paucitubulatina. Multitubulatina are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastrotrich
The gastrotrichs (phylum Gastrotricha), commonly referred to as hairybellies or hairybacks, are a group of microscopic (0.06-3.0 mm), worm-like, acoelomate animals, and are widely distributed and abundant in freshwater and marine environments. They are mostly benthic and live within the periphyton, the layer of tiny organisms and detritus that is found on the seabed and the beds of other water bodies. The majority live on and between particles of sediment or on other submerged surfaces, but a few species are terrestrial and live on land in the film of water surrounding grains of soil. Gastrotrichs are divided into two orders, the Macrodasyida which are marine (except for two species), and the Chaetonotida, some of which are marine and some freshwater. Nearly 800 species of gastrotrich have been described. Gastrotrichs have a simple body plan with a head region, with a brain and sensory organs, and a trunk with a simple gut and the reproductive organs. They have adhesive g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gastrotricha
The gastrotrichs (phylum Gastrotricha), commonly referred to as hairybellies or hairybacks, are a group of microscopic (0.06-3.0 mm), worm-like, acoelomate animals, and are widely distributed and abundant in freshwater and marine environments. They are mostly benthic and live within the periphyton, the layer of tiny organisms and detritus that is found on the seabed and the beds of other water bodies. The majority live on and between particles of sediment or on other submerged surfaces, but a few species are terrestrial and live on land in the film of water surrounding grains of soil. Gastrotrichs are divided into two orders, the Macrodasyida which are marine (except for two species), and the Chaetonotida, some of which are marine and some freshwater. Nearly 800 species of gastrotrich have been described. Gastrotrichs have a simple body plan with a head region, with a brain and sensory organs, and a trunk with a simple gut and the reproductive organs. They have adhesive g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paucitubulatina
Paucitubulatina is a suborder of gastrotrichs in the order Chaetonotida The Chaetonotida is an order of gastrotrichs. They generally have a tenpin or bottle-like shape. Chaetonotids inhabit both freshwater and marine environments. They can be distinguished from other gastrotrichs by the absence of pores in the pha .... Families * Chaetonotidae Gosse, 1864 sensu Leasi & Todaro, 2008Gosse, P. H. (1864). The natural history of the hairy-backed animalcules (Chætonotidæ). ''The Intellectual Observer'', 5, 387–406.Leasi, F. & Todaro, M. (2008). The muscular system of ''Musellifer delamarei'' (Renaud-Mornant, 1968) and other chaetonotidans with implications for the phylogeny and systematization of the Paucitubulatina (Gastrotricha). ''Biological Journal of the Linnean Society'', 94, 379–398. * Dasydytidae von Daday, 1905von Daday, E. (1905). Untersuchungen über die Süsswasser-Mikrofauna Paraguays. ''Zoologica'', 18(44), 72–86. * Dichaeturidae Remane, 1927Remane, A. (1927) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neodasys
''Neodasys'' is a genus of gastrotrichs in the class Chaetonotida. It is the only genus in the family Neodasyidae, which is the only family in the suborder Order ( la, ordo) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between family and class. In biological classification, the order is a taxonomic rank used in the classification of organisms and ... Multitubulatina. Species *'' Neodasys chaetonotoideus'' Remane, 1927 *'' Neodasys cirritus'' Evans, 1992Evans, W. A. (1992). Five new species of marine Gastrotricha from the Atlantic coast of Florida. ''Bulletin of Marine Science'', 51(3), 315–328. *'' Neodasys uchidai'' Remane, 1961Remane, A. (1961). ''Neodasys uchidai'' n. sp., eine zweite ''Neodasys''-art (Gastrotricha, Chaetonotoidea). ''Kieler Meeresforschungen'', 17, 85–88. References Gastrotricha Platyzoa genera {{protostome-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lepidodermella Squamatum
''Lepidodermella squamata'' is a freshwater species of minute worm in the phylum Gastrotricha. Description ''Lepidodermella squamata'' is a small worm-like organism growing to a length of 190 μm (0.007 inch). It is roughly cylindrical with a head, a slightly narrower neck, and a slightly wider and much longer body ending with a forked tail. There are two adhesive suckers on the posterior end. The surface of the trunk is covered in scales. There are tufts of bristles on the head and two rows of cilia on the ventral surface of the body. Distribution and habitat ''Lepidodermella squamata'' is found in North and South America, Japan and much of Europe. It is a freshwater species and is found on the surface of water plants in lakes, ponds, streams and marshes. It is also found between the particles of sediment at the bottom of the water body. Biology ''Lepidodermella squamata'' feeds on algae, bacteria and detritus. It glides across the substrate by means of the cilia on its vent ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Order (biology)
Order ( la, ordo) is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between family and class. In biological classification, the order is a taxonomic rank used in the classification of organisms and recognized by the nomenclature codes. An immediately higher rank, superorder, is sometimes added directly above order, with suborder directly beneath order. An order can also be defined as a group of related families. What does and does not belong to each order is determined by a taxonomist, as is whether a particular order should be recognized at all. Often there is no exact agreement, with different taxonomists each taking a different position. There are no hard rules that a taxonomist needs to follow in describing or recognizing an order. Some taxa are accepted almost universally, while others are recognized only rarely. The name of an order is usually written with a capital letter. For some groups of organisms, their orders may follo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pharynx
The pharynx (plural: pharynges) is the part of the throat behind the mouth and nasal cavity, and above the oesophagus and trachea (the tubes going down to the stomach and the lungs). It is found in vertebrates and invertebrates, though its structure varies across species. The pharynx carries food and air to the esophagus and larynx respectively. The flap of cartilage called the epiglottis stops food from entering the larynx. In humans, the pharynx is part of the digestive system and the conducting zone of the respiratory system. (The conducting zone—which also includes the nostrils of the nose, the larynx, trachea, bronchi, and bronchioles—filters, warms and moistens air and conducts it into the lungs). The human pharynx is conventionally divided into three sections: the nasopharynx, oropharynx, and laryngopharynx. It is also important in vocalization. In humans, two sets of pharyngeal muscles form the pharynx and determine the shape of its lumen. They are arranged as an i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parthenogenesis
Parthenogenesis (; from the Greek grc, παρθένος, translit=parthénos, lit=virgin, label=none + grc, γένεσις, translit=génesis, lit=creation, label=none) is a natural form of asexual reproduction in which growth and development of embryos occur in a gamete (egg or sperm) without combining with another gamete (e.g., egg and sperm fusing). In animals, parthenogenesis means development of an embryo from an unfertilized egg cell. In plants, parthenogenesis is a component process of apomixis. In algae, parthenogenesis can mean the development of an embryo from either an individual sperm or an individual egg. Parthenogenesis occurs naturally in some plants, algae, invertebrate animal species (including nematodes, some tardigrades, water fleas, some scorpions, aphids, some mites, some bees, some Phasmatodea and parasitic wasps) and a few vertebrates (such as some fish, amphibians, reptiles and birds). This type of reproduction has been induced artificially in a fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
