Doliolidae

Doliolidae

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	Doliolidae Doliolidae is a family of tunicates in the order Doliolida. Members of the family are pelagic and often found far away from coastlines.Doliolidae World Register of Marine Species. Retrieved 2011-11-17. Members of the family are transparent, gelatinous, barrel-shaped or cylindrical marine organisms. They are mostly small and inconspicuous. They have cilia which move water through the mucus nets which they use to trap the phytoplankton on which they feed. This is in contrast to their close ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Dolioletta Gegenbauri ''Dolioletta gegenbauri'' is a species of tunicate in the family Doliolidae. It is small, exists in various forms and is sometimes found in great abundance in the Atlantic and Pacific waters where it lives. Life cycle ''Dolioletta gegenbauri'' is a small, transparent, gelatinous marine invertebrate up to one centimetre long. It has a complex life cycle and exists in several forms of which the gonozooid, or mature zooid with gonads, is the most often seen. It is roughly cylindrical with a siphon at both of the flat ends, and has 8 bands of muscle arranged like hoops round a barrel. The U-shaped gut and other organs can be seen through the test which is pierced by 10 to 40 gill slits. The gonozooid is hermaphrodite and the eggs are fertilised by sperm from another individual. These develop into oozooids which have no reproductive organs. They have 9 bands of muscle and are known as "nurses" as they develop a tail of zooids produced asexually. Some of these are known as gastrozoo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Dolioletta ''Dolioletta'' is a genus of tunicates in the family Doliolidae. Characteristics Members of the genus ''Dolioletta'' are transparent, gelatinous barrel-shaped animals, usually less than one centimetre long. They move in jerks by contracting the circular bands of muscle in their body wall sharply.''Dolioletta'' JelliesZone. Retrieved 2011-11-17. Biology They have the complex life cycle typical of the Doliolida, doliolids, with alternating sexual and asexual phases. They use a net of mucus strands to efficiently trap phytoplankton floating past. They both grow fast and multiply rapidly and a single animal is capable of forming thousands of new individuals in a few days. They sometimes form dense swarms with up to 500 individuals per square metre. Species The World Register of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Doliolina ''Doliolina'' is a genus of tunicates belonging to the family Doliolidae Doliolidae is a family of tunicates in the order Doliolida. Members of the family are pelagic and often found far away from coastlines. . The species of this genus are found in Southern Hemisphere. Species: '' Doliolina indica'' '' Doliolina intermedia'' '' Doliolina krohni'' '' [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Dolioletta Valdiviae ''Dolioletta'' is a genus of tunicates in the family Doliolidae. Characteristics Members of the genus ''Dolioletta'' are transparent, gelatinous barrel-shaped animals, usually less than one centimetre long. They move in jerks by contracting the circular bands of muscle in their body wall sharply.''Dolioletta'' JelliesZone. Retrieved 2011-11-17. Biology They have the complex life cycle typical of the doliolids , with alternating sexual and asexual phases. They use a net of mucus strands to efficiently trap phytoplankton floating past. They both grow fast and multiply rapidly and a s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Dolioletta Tritonis ''Dolioletta'' is a genus of tunicates in the family Doliolidae. Characteristics Members of the genus ''Dolioletta'' are transparent, gelatinous barrel-shaped animals, usually less than one centimetre long. They move in jerks by contracting the circular bands of muscle in their body wall sharply.''Dolioletta'' JelliesZone. Retrieved 2011-11-17. Biology They have the complex life cycle typical of the doliolids , with alternating sexual and asexual phases. They use a net of mucus strands to efficiently trap phytoplankton floating past. They both grow fast and multiply rapidly and a s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Dolioletta Mirabilis ''Dolioletta mirabilis'' is a species of tunicate in the family Doliolidae. It is small, exists in various forms and is sometimes found in great abundance in the Indo-Pacific waters where it lives. Description The gonozooids are the most often encountered of the forms of this animal. They are solitary hermaphrodite In reproductive biology, a hermaphrodite () is an organism that has both kinds of reproductive organs and can produce both gametes associated with male and female sexes. Many Taxonomy (biology), taxonomic groups of animals (mostly invertebrate ...s with eight bands of muscle that encircle the body. These gonozooids produce the oozooids, which are usually seen in smaller numbers within the population. Oozooids are distinguished by a conspicuous tail of asexually produced zooids, and have nine circumferential bands of muscle. References {{Taxonbar, from=Q4910801 Thaliacea Animals described in 1891 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Dolioletta Chuni ''Dolioletta'' is a genus of tunicates in the family Doliolidae. Characteristics Members of the genus ''Dolioletta'' are transparent, gelatinous barrel-shaped animals, usually less than one centimetre long. They move in jerks by contracting the circular bands of muscle in their body wall sharply.''Dolioletta'' JelliesZone. Retrieved 2011-11-17. Biology They have the complex life cycle typical of the doliolids , with alternating sexual and asexual phases. They use a net of mucus strands to efficiently trap phytoplankton floating past. They both grow fast and multiply rapidly and a s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Thaliacea The Thaliacea comprise a class of marine animals within the subphylum Tunicata. Unlike their benthic relatives the ascidians, thaliaceans are free-floating (pelagic) for their entire lifespan. The group includes species with complex life cycles, with both solitary and colonial forms. Anatomy The three orders of thaliaceans are filter feeders. Pyrosomes are colonial animals, with multiple tiny ascidian-like zooids arranged in a cylinder closed at one end. All of the atrial siphons point inwards, emptying into a single, common cloaca in the centre of the cylinder. As the water exhaled by the zooids exits through a common opening, the water movement slowly propels the pyrosome through the sea. Salps and doliolids have a transparent barrel-shaped body through which they pump water, propelling them through the sea, and from which they extract food. The bulk of the body consists of the large pharynx. Water enters the pharynx through the large buccal siphon at the front end of the a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Asexual Reproduction Asexual reproduction is a type of reproduction that does not involve the fusion of gametes or change in the number of chromosomes. The offspring that arise by asexual reproduction from either unicellular or multicellular organisms inherit the full set of genes of their single parent and thus the newly created individual is genetically and physically similar to the parent or an exact clone of the parent. Asexual reproduction is the primary form of reproduction for single-celled organisms such as archaea and eubacteria, bacteria. Many Eukaryote, eukaryotic organisms including plants, animals, and Fungus, fungi can also reproduce asexually. In vertebrates, the most common form of asexual reproduction is parthenogenesis, which is typically used as an alternative to sexual reproduction in times when reproductive opportunities are limited. Komodo dragons and some monitor lizards can also reproduce asexually. While all prokaryotes reproduce without the formation and fusion of gametes, m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Salp A salp (plural salps, also known colloquially as “sea grape”) or salpa (plural salpae or salpas) is a barrel-shaped, planktic tunicate. It moves by contracting, thereby pumping water through its gelatinous body, one of the most efficient examples of jet propulsion in the animal kingdom. The salp strains the pumped water through its internal feeding filters, feeding on phytoplankton. Distribution Salps are common in equatorial, temperate, and cold seas, where they can be seen at the surface, singly or in long, stringy colonies. The most abundant concentrations of salps are in the Southern Ocean (near Antarctica), where they sometimes form enormous swarms, often in deep water, and are sometimes even more abundant than krill. Since 1910, while krill populations in the Southern Ocean have declined, salp populations appear to be increasing. Salps have been seen in increasing numbers along the coast of Washington. Life cycle Salps have a complex life cycle, with an obligatory a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Phytoplankton Phytoplankton () are the autotrophic (self-feeding) components of the plankton community and a key part of ocean and freshwater ecosystems. The name comes from the Greek words (), meaning 'plant', and (), meaning 'wanderer' or 'drifter'. Phytoplankton obtain their energy through photosynthesis, as do trees and other plants on land. This means phytoplankton must have light from the sun, so they live in the well-lit surface layers (euphotic zone) of oceans and lakes. In comparison with terrestrial plants, phytoplankton are distributed over a larger surface area, are exposed to less seasonal variation and have markedly faster turnover rates than trees (days versus decades). As a result, phytoplankton respond rapidly on a global scale to climate variations. Phytoplankton form the base of marine and freshwater food webs and are key players in the global carbon cycle. They account for about half of global photosynthetic activity and at least half of the oxygen production, despite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Tunicate A tunicate is a marine invertebrate animal, a member of the subphylum Tunicata (). It is part of the Chordata, a phylum which includes all animals with dorsal nerve cords and notochords (including vertebrates). The subphylum was at one time called Urochordata, and the term urochordates is still sometimes used for these animals. They are the only chordates that have lost their myomeric segmentation, with the possible exception of the 'seriation of the gill slits'. Some tunicates live as solitary individuals, but others replicate by budding and become colonies, each unit being known as a zooid. They are marine filter feeders with a water-filled, sac-like body structure and two tubular openings, known as siphons, through which they draw in and expel water. During their respiration and feeding, they take in water through the incurrent (or inhalant) siphon and expel the filtered water through the excurrent (or exhalant) siphon. Most adult tunicates are sessile, immobile and perman ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]